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From ga...@apache.org
Subject [18/51] [abbrv] hive git commit: HIVE-17980 Moved HiveMetaStoreClient plus a few remaining classes.
Date Tue, 21 Nov 2017 23:57:01 GMT
http://git-wip-us.apache.org/repos/asf/hive/blob/824d701f/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java
----------------------------------------------------------------------
diff --git a/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java b/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java
deleted file mode 100644
index b5a9b79..0000000
--- a/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java
+++ /dev/null
@@ -1,2727 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.hive.metastore;
-
-import static org.apache.hadoop.hive.metastore.Warehouse.DEFAULT_DATABASE_NAME;
-import static org.apache.hadoop.hive.metastore.MetaStoreUtils.isIndexTable;
-
-import java.io.IOException;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Proxy;
-import java.net.InetAddress;
-import java.net.URI;
-import java.net.UnknownHostException;
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.NoSuchElementException;
-import java.util.Random;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicInteger;
-import java.security.PrivilegedExceptionAction;
-
-import javax.security.auth.login.LoginException;
-
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hive.common.ObjectPair;
-import org.apache.hadoop.hive.common.StatsSetupConst;
-import org.apache.hadoop.hive.common.ValidTxnList;
-import org.apache.hadoop.hive.common.auth.HiveAuthUtils;
-import org.apache.hadoop.hive.common.classification.InterfaceAudience;
-import org.apache.hadoop.hive.common.classification.InterfaceAudience.Public;
-import org.apache.hadoop.hive.common.classification.InterfaceStability.Unstable;
-import org.apache.hadoop.hive.conf.HiveConf;
-import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
-import org.apache.hadoop.hive.conf.HiveConfUtil;
-import org.apache.hadoop.hive.metastore.api.*;
-import org.apache.hadoop.hive.metastore.TableType;
-import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
-import org.apache.hadoop.hive.metastore.partition.spec.PartitionSpecProxy;
-import org.apache.hadoop.hive.metastore.security.HadoopThriftAuthBridge;
-import org.apache.hadoop.hive.metastore.txn.TxnUtils;
-import org.apache.hadoop.hive.metastore.utils.SecurityUtils;
-import org.apache.hadoop.hive.shims.Utils;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.util.StringUtils;
-import org.apache.thrift.TApplicationException;
-import org.apache.thrift.TException;
-import org.apache.thrift.protocol.TBinaryProtocol;
-import org.apache.thrift.protocol.TCompactProtocol;
-import org.apache.thrift.protocol.TProtocol;
-import org.apache.thrift.transport.TFramedTransport;
-import org.apache.thrift.transport.TSocket;
-import org.apache.thrift.transport.TTransport;
-import org.apache.thrift.transport.TTransportException;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.collect.Lists;
-
-/**
- * Hive Metastore Client.
- * The public implementation of IMetaStoreClient. Methods not inherited from IMetaStoreClient
- * are not public and can change. Hence this is marked as unstable.
- * For users who require retry mechanism when the connection between metastore and client is
- * broken, RetryingMetaStoreClient class should be used.
- */
-@Public
-@Unstable
-public class HiveMetaStoreClient implements IMetaStoreClient, AutoCloseable {
-  /**
-   * Capabilities of the current client. If this client talks to a MetaStore server in a manner
-   * implying the usage of some expanded features that require client-side support that this client
-   * doesn't have (e.g. a getting a table of a new type), it will get back failures when the
-   * capability checking is enabled (the default).
-   */
-  public final static ClientCapabilities VERSION = new ClientCapabilities(
-      Lists.newArrayList(ClientCapability.INSERT_ONLY_TABLES));
-  // Test capability for tests.
-  public final static ClientCapabilities TEST_VERSION = new ClientCapabilities(
-      Lists.newArrayList(ClientCapability.INSERT_ONLY_TABLES, ClientCapability.TEST_CAPABILITY));
-
-  ThriftHiveMetastore.Iface client = null;
-  private TTransport transport = null;
-  private boolean isConnected = false;
-  private URI metastoreUris[];
-  private final HiveMetaHookLoader hookLoader;
-  protected final HiveConf conf;  // Keep a copy of HiveConf so if Session conf changes, we may need to get a new HMS client.
-  protected boolean fastpath = false;
-  private String tokenStrForm;
-  private final boolean localMetaStore;
-  private final MetaStoreFilterHook filterHook;
-  private final int fileMetadataBatchSize;
-
-  private Map<String, String> currentMetaVars;
-
-  private static final AtomicInteger connCount = new AtomicInteger(0);
-
-  // for thrift connects
-  private int retries = 5;
-  private long retryDelaySeconds = 0;
-  private final ClientCapabilities version;
-
-  static final protected Logger LOG = LoggerFactory.getLogger(HiveMetaStoreClient.class);
-
-  public HiveMetaStoreClient(HiveConf conf) throws MetaException {
-    this(conf, null, true);
-  }
-
-  public HiveMetaStoreClient(HiveConf conf, HiveMetaHookLoader hookLoader) throws MetaException {
-    this(conf, hookLoader, true);
-  }
-
-  public HiveMetaStoreClient(HiveConf conf, HiveMetaHookLoader hookLoader, Boolean allowEmbedded)
-    throws MetaException {
-
-    this.hookLoader = hookLoader;
-    if (conf == null) {
-      conf = new HiveConf(HiveMetaStoreClient.class);
-      this.conf = conf;
-    } else {
-      this.conf = new HiveConf(conf);
-    }
-    version = HiveConf.getBoolVar(conf, ConfVars.HIVE_IN_TEST) ? TEST_VERSION : VERSION;
-    filterHook = loadFilterHooks();
-    fileMetadataBatchSize = HiveConf.getIntVar(
-        conf, HiveConf.ConfVars.METASTORE_BATCH_RETRIEVE_OBJECTS_MAX);
-
-    String msUri = conf.getVar(ConfVars.METASTOREURIS);
-    localMetaStore = HiveConfUtil.isEmbeddedMetaStore(msUri);
-    if (localMetaStore) {
-      if (!allowEmbedded) {
-        throw new MetaException("Embedded metastore is not allowed here. Please configure "
-            + ConfVars.METASTOREURIS.varname + "; it is currently set to [" + msUri + "]");
-      }
-      // instantiate the metastore server handler directly instead of connecting
-      // through the network
-      if (conf.getBoolVar(ConfVars.METASTORE_FASTPATH)) {
-        client = new HiveMetaStore.HMSHandler("hive client", this.conf, true);
-        fastpath = true;
-      } else {
-        client = HiveMetaStore.newRetryingHMSHandler("hive client", this.conf, true);
-      }
-      isConnected = true;
-      snapshotActiveConf();
-      return;
-    } else {
-      if (conf.getBoolVar(ConfVars.METASTORE_FASTPATH)) {
-        throw new RuntimeException("You can't set hive.metastore.fastpath to true when you're " +
-            "talking to the thrift metastore service.  You must run the metastore locally.");
-      }
-    }
-
-    // get the number retries
-    retries = HiveConf.getIntVar(conf, HiveConf.ConfVars.METASTORETHRIFTCONNECTIONRETRIES);
-    retryDelaySeconds = conf.getTimeVar(
-        ConfVars.METASTORE_CLIENT_CONNECT_RETRY_DELAY, TimeUnit.SECONDS);
-
-    // user wants file store based configuration
-    if (conf.getVar(HiveConf.ConfVars.METASTOREURIS) != null) {
-      String metastoreUrisString[] = conf.getVar(
-          HiveConf.ConfVars.METASTOREURIS).split(",");
-      metastoreUris = new URI[metastoreUrisString.length];
-      try {
-        int i = 0;
-        for (String s : metastoreUrisString) {
-          URI tmpUri = new URI(s);
-          if (tmpUri.getScheme() == null) {
-            throw new IllegalArgumentException("URI: " + s
-                + " does not have a scheme");
-          }
-          metastoreUris[i++] = new URI(
-              tmpUri.getScheme(),
-              tmpUri.getUserInfo(),
-              HadoopThriftAuthBridge.getBridge().getCanonicalHostName(tmpUri.getHost()),
-              tmpUri.getPort(),
-              tmpUri.getPath(),
-              tmpUri.getQuery(),
-              tmpUri.getFragment()
-          );
-
-        }
-        // make metastore URIS random
-        List<?> uriList = Arrays.asList(metastoreUris);
-        Collections.shuffle(uriList);
-        metastoreUris = (URI[]) uriList.toArray();
-      } catch (IllegalArgumentException e) {
-        throw (e);
-      } catch (Exception e) {
-        MetaStoreUtils.logAndThrowMetaException(e);
-      }
-    } else {
-      LOG.error("NOT getting uris from conf");
-      throw new MetaException("MetaStoreURIs not found in conf file");
-    }
-
-    //If HADOOP_PROXY_USER is set in env or property,
-    //then need to create metastore client that proxies as that user.
-    String HADOOP_PROXY_USER = "HADOOP_PROXY_USER";
-    String proxyUser = System.getenv(HADOOP_PROXY_USER);
-    if (proxyUser == null) {
-      proxyUser = System.getProperty(HADOOP_PROXY_USER);
-    }
-    //if HADOOP_PROXY_USER is set, create DelegationToken using real user
-    if(proxyUser != null) {
-      LOG.info(HADOOP_PROXY_USER + " is set. Using delegation "
-          + "token for HiveMetaStore connection.");
-      try {
-        UserGroupInformation.getLoginUser().getRealUser().doAs(
-            new PrivilegedExceptionAction<Void>() {
-              @Override
-              public Void run() throws Exception {
-                open();
-                return null;
-              }
-            });
-        String delegationTokenPropString = "DelegationTokenForHiveMetaStoreServer";
-        String delegationTokenStr = getDelegationToken(proxyUser, proxyUser);
-        SecurityUtils.setTokenStr(UserGroupInformation.getCurrentUser(), delegationTokenStr,
-            delegationTokenPropString);
-        this.conf.setVar(ConfVars.METASTORE_TOKEN_SIGNATURE, delegationTokenPropString);
-        close();
-      } catch (Exception e) {
-        LOG.error("Error while setting delegation token for " + proxyUser, e);
-        if(e instanceof MetaException) {
-          throw (MetaException)e;
-        } else {
-          throw new MetaException(e.getMessage());
-        }
-      }
-    }
-    // finally open the store
-    open();
-  }
-
-  private MetaStoreFilterHook loadFilterHooks() throws IllegalStateException {
-    Class<? extends MetaStoreFilterHook> authProviderClass = conf.
-        getClass(HiveConf.ConfVars.METASTORE_FILTER_HOOK.varname,
-            DefaultMetaStoreFilterHookImpl.class,
-            MetaStoreFilterHook.class);
-    String msg = "Unable to create instance of " + authProviderClass.getName() + ": ";
-    try {
-      Constructor<? extends MetaStoreFilterHook> constructor =
-          authProviderClass.getConstructor(Configuration.class);
-      return constructor.newInstance(conf);
-    } catch (NoSuchMethodException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    } catch (SecurityException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    } catch (InstantiationException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    } catch (IllegalAccessException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    } catch (IllegalArgumentException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    } catch (InvocationTargetException e) {
-      throw new IllegalStateException(msg + e.getMessage(), e);
-    }
-  }
-
-  /**
-   * Swaps the first element of the metastoreUris array with a random element from the
-   * remainder of the array.
-   */
-  private void promoteRandomMetaStoreURI() {
-    if (metastoreUris.length <= 1) {
-      return;
-    }
-    Random rng = new Random();
-    int index = rng.nextInt(metastoreUris.length - 1) + 1;
-    URI tmp = metastoreUris[0];
-    metastoreUris[0] = metastoreUris[index];
-    metastoreUris[index] = tmp;
-  }
-
-  @VisibleForTesting
-  public TTransport getTTransport() {
-    return transport;
-  }
-
-  @Override
-  public boolean isLocalMetaStore() {
-    return localMetaStore;
-  }
-
-  @Override
-  public boolean isCompatibleWith(HiveConf conf) {
-    // Make a copy of currentMetaVars, there is a race condition that
-	// currentMetaVars might be changed during the execution of the method
-    Map<String, String> currentMetaVarsCopy = currentMetaVars;
-    if (currentMetaVarsCopy == null) {
-      return false; // recreate
-    }
-    boolean compatible = true;
-    for (ConfVars oneVar : HiveConf.metaVars) {
-      // Since metaVars are all of different types, use string for comparison
-      String oldVar = currentMetaVarsCopy.get(oneVar.varname);
-      String newVar = conf.get(oneVar.varname, "");
-      if (oldVar == null ||
-          (oneVar.isCaseSensitive() ? !oldVar.equals(newVar) : !oldVar.equalsIgnoreCase(newVar))) {
-        LOG.info("Mestastore configuration " + oneVar.varname +
-            " changed from " + oldVar + " to " + newVar);
-        compatible = false;
-      }
-    }
-    return compatible;
-  }
-
-  @Override
-  public void setHiveAddedJars(String addedJars) {
-    HiveConf.setVar(conf, ConfVars.HIVEADDEDJARS, addedJars);
-  }
-
-  @Override
-  public void reconnect() throws MetaException {
-    if (localMetaStore) {
-      // For direct DB connections we don't yet support reestablishing connections.
-      throw new MetaException("For direct MetaStore DB connections, we don't support retries" +
-          " at the client level.");
-    } else {
-      close();
-      // Swap the first element of the metastoreUris[] with a random element from the rest
-      // of the array. Rationale being that this method will generally be called when the default
-      // connection has died and the default connection is likely to be the first array element.
-      promoteRandomMetaStoreURI();
-      open();
-    }
-  }
-
-  /**
-   * @param dbname
-   * @param tbl_name
-   * @param new_tbl
-   * @throws InvalidOperationException
-   * @throws MetaException
-   * @throws TException
-   * @see
-   *   org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#alter_table(
-   *   java.lang.String, java.lang.String,
-   *   org.apache.hadoop.hive.metastore.api.Table)
-   */
-  @Override
-  public void alter_table(String dbname, String tbl_name, Table new_tbl)
-      throws InvalidOperationException, MetaException, TException {
-    alter_table_with_environmentContext(dbname, tbl_name, new_tbl, null);
-  }
-
-  @Override
-  public void alter_table(String defaultDatabaseName, String tblName, Table table,
-      boolean cascade) throws InvalidOperationException, MetaException, TException {
-    EnvironmentContext environmentContext = new EnvironmentContext();
-    if (cascade) {
-      environmentContext.putToProperties(StatsSetupConst.CASCADE, StatsSetupConst.TRUE);
-    }
-    alter_table_with_environmentContext(defaultDatabaseName, tblName, table, environmentContext);
-  }
-
-  @Override
-  public void alter_table_with_environmentContext(String dbname, String tbl_name, Table new_tbl,
-      EnvironmentContext envContext) throws InvalidOperationException, MetaException, TException {
-    client.alter_table_with_environment_context(dbname, tbl_name, new_tbl, envContext);
-  }
-
-  /**
-   * @param dbname
-   * @param name
-   * @param part_vals
-   * @param newPart
-   * @throws InvalidOperationException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#rename_partition(
-   *      java.lang.String, java.lang.String, java.util.List, org.apache.hadoop.hive.metastore.api.Partition)
-   */
-  @Override
-  public void renamePartition(final String dbname, final String name, final List<String> part_vals, final Partition newPart)
-      throws InvalidOperationException, MetaException, TException {
-    client.rename_partition(dbname, name, part_vals, newPart);
-  }
-
-  private void open() throws MetaException {
-    isConnected = false;
-    TTransportException tte = null;
-    boolean useSSL = conf.getBoolVar(ConfVars.HIVE_METASTORE_USE_SSL);
-    boolean useSasl = conf.getBoolVar(ConfVars.METASTORE_USE_THRIFT_SASL);
-    boolean useFramedTransport = conf.getBoolVar(ConfVars.METASTORE_USE_THRIFT_FRAMED_TRANSPORT);
-    boolean useCompactProtocol = conf.getBoolVar(ConfVars.METASTORE_USE_THRIFT_COMPACT_PROTOCOL);
-    int clientSocketTimeout = (int) conf.getTimeVar(
-        ConfVars.METASTORE_CLIENT_SOCKET_TIMEOUT, TimeUnit.MILLISECONDS);
-
-    for (int attempt = 0; !isConnected && attempt < retries; ++attempt) {
-      for (URI store : metastoreUris) {
-        LOG.info("Trying to connect to metastore with URI " + store);
-
-        try {
-          if (useSSL) {
-            try {
-              String trustStorePath = conf.getVar(ConfVars.HIVE_METASTORE_SSL_TRUSTSTORE_PATH).trim();
-              if (trustStorePath.isEmpty()) {
-                throw new IllegalArgumentException(ConfVars.HIVE_METASTORE_SSL_TRUSTSTORE_PATH.varname
-                    + " Not configured for SSL connection");
-              }
-              String trustStorePassword =
-                  MetastoreConf.getPassword(conf, MetastoreConf.ConfVars.SSL_TRUSTSTORE_PASSWORD);
-
-              // Create an SSL socket and connect
-              transport = HiveAuthUtils.getSSLSocket(store.getHost(), store.getPort(), clientSocketTimeout, trustStorePath, trustStorePassword );
-              LOG.info("Opened an SSL connection to metastore, current connections: " + connCount.incrementAndGet());
-            } catch(IOException e) {
-              throw new IllegalArgumentException(e);
-            } catch(TTransportException e) {
-              tte = e;
-              throw new MetaException(e.toString());
-            }
-          } else {
-            transport = new TSocket(store.getHost(), store.getPort(), clientSocketTimeout);
-          }
-
-          if (useSasl) {
-            // Wrap thrift connection with SASL for secure connection.
-            try {
-              HadoopThriftAuthBridge.Client authBridge =
-                HadoopThriftAuthBridge.getBridge().createClient();
-
-              // check if we should use delegation tokens to authenticate
-              // the call below gets hold of the tokens if they are set up by hadoop
-              // this should happen on the map/reduce tasks if the client added the
-              // tokens into hadoop's credential store in the front end during job
-              // submission.
-              String tokenSig = conf.getVar(ConfVars.METASTORE_TOKEN_SIGNATURE);
-              // tokenSig could be null
-              tokenStrForm = SecurityUtils.getTokenStrForm(tokenSig);
-
-              if(tokenStrForm != null) {
-                LOG.info("HMSC::open(): Found delegation token. Creating DIGEST-based thrift connection.");
-                // authenticate using delegation tokens via the "DIGEST" mechanism
-                transport = authBridge.createClientTransport(null, store.getHost(),
-                    "DIGEST", tokenStrForm, transport,
-                        MetaStoreUtils.getMetaStoreSaslProperties(conf, useSSL));
-              } else {
-                LOG.info("HMSC::open(): Could not find delegation token. Creating KERBEROS-based thrift connection.");
-                String principalConfig =
-                    conf.getVar(HiveConf.ConfVars.METASTORE_KERBEROS_PRINCIPAL);
-                transport = authBridge.createClientTransport(
-                    principalConfig, store.getHost(), "KERBEROS", null,
-                    transport, MetaStoreUtils.getMetaStoreSaslProperties(conf, useSSL));
-              }
-            } catch (IOException ioe) {
-              LOG.error("Couldn't create client transport", ioe);
-              throw new MetaException(ioe.toString());
-            }
-          } else {
-            if (useFramedTransport) {
-              transport = new TFramedTransport(transport);
-            }
-          }
-
-          final TProtocol protocol;
-          if (useCompactProtocol) {
-            protocol = new TCompactProtocol(transport);
-          } else {
-            protocol = new TBinaryProtocol(transport);
-          }
-          client = new ThriftHiveMetastore.Client(protocol);
-          try {
-            if (!transport.isOpen()) {
-              transport.open();
-              LOG.info("Opened a connection to metastore, current connections: " + connCount.incrementAndGet());
-            }
-            isConnected = true;
-          } catch (TTransportException e) {
-            tte = e;
-            if (LOG.isDebugEnabled()) {
-              LOG.warn("Failed to connect to the MetaStore Server...", e);
-            } else {
-              // Don't print full exception trace if DEBUG is not on.
-              LOG.warn("Failed to connect to the MetaStore Server...");
-            }
-          }
-
-          if (isConnected && !useSasl && conf.getBoolVar(ConfVars.METASTORE_EXECUTE_SET_UGI)){
-            // Call set_ugi, only in unsecure mode.
-            try {
-              UserGroupInformation ugi = Utils.getUGI();
-              client.set_ugi(ugi.getUserName(), Arrays.asList(ugi.getGroupNames()));
-            } catch (LoginException e) {
-              LOG.warn("Failed to do login. set_ugi() is not successful, " +
-                       "Continuing without it.", e);
-            } catch (IOException e) {
-              LOG.warn("Failed to find ugi of client set_ugi() is not successful, " +
-                  "Continuing without it.", e);
-            } catch (TException e) {
-              LOG.warn("set_ugi() not successful, Likely cause: new client talking to old server. "
-                  + "Continuing without it.", e);
-            }
-          }
-        } catch (MetaException e) {
-          LOG.error("Unable to connect to metastore with URI " + store
-                    + " in attempt " + attempt, e);
-        }
-        if (isConnected) {
-          break;
-        }
-      }
-      // Wait before launching the next round of connection retries.
-      if (!isConnected && retryDelaySeconds > 0) {
-        try {
-          LOG.info("Waiting " + retryDelaySeconds + " seconds before next connection attempt.");
-          Thread.sleep(retryDelaySeconds * 1000);
-        } catch (InterruptedException ignore) {}
-      }
-    }
-
-    if (!isConnected) {
-      throw new MetaException("Could not connect to meta store using any of the URIs provided." +
-        " Most recent failure: " + StringUtils.stringifyException(tte));
-    }
-
-    snapshotActiveConf();
-
-    LOG.info("Connected to metastore.");
-  }
-
-  private void snapshotActiveConf() {
-    currentMetaVars = new HashMap<String, String>(HiveConf.metaVars.length);
-    for (ConfVars oneVar : HiveConf.metaVars) {
-      currentMetaVars.put(oneVar.varname, conf.get(oneVar.varname, ""));
-    }
-  }
-
-  @Override
-  public String getTokenStrForm() throws IOException {
-    return tokenStrForm;
-   }
-
-  @Override
-  public void close() {
-    isConnected = false;
-    currentMetaVars = null;
-    try {
-      if (null != client) {
-        client.shutdown();
-      }
-    } catch (TException e) {
-      LOG.debug("Unable to shutdown metastore client. Will try closing transport directly.", e);
-    }
-    // Transport would have got closed via client.shutdown(), so we dont need this, but
-    // just in case, we make this call.
-    if ((transport != null) && transport.isOpen()) {
-      transport.close();
-      LOG.info("Closed a connection to metastore, current connections: " + connCount.decrementAndGet());
-    }
-  }
-
-  @Override
-  public void setMetaConf(String key, String value) throws TException {
-    client.setMetaConf(key, value);
-  }
-
-  @Override
-  public String getMetaConf(String key) throws TException {
-    return client.getMetaConf(key);
-  }
-
-  /**
-   * @param new_part
-   * @return the added partition
-   * @throws InvalidObjectException
-   * @throws AlreadyExistsException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#add_partition(org.apache.hadoop.hive.metastore.api.Partition)
-   */
-  @Override
-  public Partition add_partition(Partition new_part)
-      throws InvalidObjectException, AlreadyExistsException, MetaException,
-      TException {
-    return add_partition(new_part, null);
-  }
-
-  public Partition add_partition(Partition new_part, EnvironmentContext envContext)
-      throws InvalidObjectException, AlreadyExistsException, MetaException,
-      TException {
-    Partition p = client.add_partition_with_environment_context(new_part, envContext);
-    return fastpath ? p : deepCopy(p);
-  }
-
-  /**
-   * @param new_parts
-   * @throws InvalidObjectException
-   * @throws AlreadyExistsException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#add_partitions(List)
-   */
-  @Override
-  public int add_partitions(List<Partition> new_parts)
-      throws InvalidObjectException, AlreadyExistsException, MetaException,
-      TException {
-    return client.add_partitions(new_parts);
-  }
-
-  @Override
-  public List<Partition> add_partitions(
-      List<Partition> parts, boolean ifNotExists, boolean needResults)
-      throws InvalidObjectException, AlreadyExistsException, MetaException, TException {
-    if (parts.isEmpty()) {
-      return needResults ? new ArrayList<Partition>() : null;
-    }
-    Partition part = parts.get(0);
-    AddPartitionsRequest req = new AddPartitionsRequest(
-        part.getDbName(), part.getTableName(), parts, ifNotExists);
-    req.setNeedResult(needResults);
-    AddPartitionsResult result = client.add_partitions_req(req);
-    return needResults ? filterHook.filterPartitions(result.getPartitions()) : null;
-  }
-
-  @Override
-  public int add_partitions_pspec(PartitionSpecProxy partitionSpec) throws TException {
-    return client.add_partitions_pspec(partitionSpec.toPartitionSpec());
-  }
-
-  /**
-   * @param table_name
-   * @param db_name
-   * @param part_vals
-   * @return the appended partition
-   * @throws InvalidObjectException
-   * @throws AlreadyExistsException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#append_partition(java.lang.String,
-   *      java.lang.String, java.util.List)
-   */
-  @Override
-  public Partition appendPartition(String db_name, String table_name,
-      List<String> part_vals) throws InvalidObjectException,
-      AlreadyExistsException, MetaException, TException {
-    return appendPartition(db_name, table_name, part_vals, null);
-  }
-
-  public Partition appendPartition(String db_name, String table_name, List<String> part_vals,
-      EnvironmentContext envContext) throws InvalidObjectException, AlreadyExistsException,
-      MetaException, TException {
-    Partition p = client.append_partition_with_environment_context(db_name, table_name,
-        part_vals, envContext);
-    return fastpath ? p : deepCopy(p);
-  }
-
-  @Override
-  public Partition appendPartition(String dbName, String tableName, String partName)
-      throws InvalidObjectException, AlreadyExistsException, MetaException, TException {
-    return appendPartition(dbName, tableName, partName, null);
-  }
-
-  public Partition appendPartition(String dbName, String tableName, String partName,
-      EnvironmentContext envContext) throws InvalidObjectException, AlreadyExistsException,
-      MetaException, TException {
-    Partition p = client.append_partition_by_name_with_environment_context(dbName, tableName,
-        partName, envContext);
-    return fastpath ? p : deepCopy(p);
-  }
-
-  /**
-   * Exchange the partition between two tables
-   * @param partitionSpecs partitions specs of the parent partition to be exchanged
-   * @param destDb the db of the destination table
-   * @param destinationTableName the destination table name
-   * @return new partition after exchanging
-   */
-  @Override
-  public Partition exchange_partition(Map<String, String> partitionSpecs,
-      String sourceDb, String sourceTable, String destDb,
-      String destinationTableName) throws MetaException,
-      NoSuchObjectException, InvalidObjectException, TException {
-    return client.exchange_partition(partitionSpecs, sourceDb, sourceTable,
-        destDb, destinationTableName);
-  }
-
-  /**
-   * Exchange the partitions between two tables
-   * @param partitionSpecs partitions specs of the parent partition to be exchanged
-   * @param destDb the db of the destination table
-   * @param destinationTableName the destination table name
-   * @return new partitions after exchanging
-   */
-  @Override
-  public List<Partition> exchange_partitions(Map<String, String> partitionSpecs,
-      String sourceDb, String sourceTable, String destDb,
-      String destinationTableName) throws MetaException,
-      NoSuchObjectException, InvalidObjectException, TException {
-    return client.exchange_partitions(partitionSpecs, sourceDb, sourceTable,
-        destDb, destinationTableName);
-  }
-
-  @Override
-  public void validatePartitionNameCharacters(List<String> partVals)
-      throws TException, MetaException {
-    client.partition_name_has_valid_characters(partVals, true);
-  }
-
-  /**
-   * Create a new Database
-   * @param db
-   * @throws AlreadyExistsException
-   * @throws InvalidObjectException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#create_database(Database)
-   */
-  @Override
-  public void createDatabase(Database db)
-      throws AlreadyExistsException, InvalidObjectException, MetaException, TException {
-    client.create_database(db);
-  }
-
-  /**
-   * @param tbl
-   * @throws MetaException
-   * @throws NoSuchObjectException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#create_table(org.apache.hadoop.hive.metastore.api.Table)
-   */
-  @Override
-  public void createTable(Table tbl) throws AlreadyExistsException,
-      InvalidObjectException, MetaException, NoSuchObjectException, TException {
-    createTable(tbl, null);
-  }
-
-  public void createTable(Table tbl, EnvironmentContext envContext) throws AlreadyExistsException,
-      InvalidObjectException, MetaException, NoSuchObjectException, TException {
-    HiveMetaHook hook = getHook(tbl);
-    if (hook != null) {
-      hook.preCreateTable(tbl);
-    }
-    boolean success = false;
-    try {
-      // Subclasses can override this step (for example, for temporary tables)
-      create_table_with_environment_context(tbl, envContext);
-      if (hook != null) {
-        hook.commitCreateTable(tbl);
-      }
-      success = true;
-    }
-    finally {
-      if (!success && (hook != null)) {
-        try {
-          hook.rollbackCreateTable(tbl);
-        } catch (Exception e){
-          LOG.error("Create rollback failed with", e);
-        }
-      }
-    }
-  }
-
-  @Override
-  public void createTableWithConstraints(Table tbl,
-    List<SQLPrimaryKey> primaryKeys, List<SQLForeignKey> foreignKeys,
-    List<SQLUniqueConstraint> uniqueConstraints,
-    List<SQLNotNullConstraint> notNullConstraints)
-        throws AlreadyExistsException, InvalidObjectException,
-        MetaException, NoSuchObjectException, TException {
-    HiveMetaHook hook = getHook(tbl);
-    if (hook != null) {
-      hook.preCreateTable(tbl);
-    }
-    boolean success = false;
-    try {
-      // Subclasses can override this step (for example, for temporary tables)
-      client.create_table_with_constraints(tbl, primaryKeys, foreignKeys,
-          uniqueConstraints, notNullConstraints);
-      if (hook != null) {
-        hook.commitCreateTable(tbl);
-      }
-      success = true;
-    } finally {
-      if (!success && (hook != null)) {
-        hook.rollbackCreateTable(tbl);
-      }
-    }
-  }
-
-  @Override
-  public void dropConstraint(String dbName, String tableName, String constraintName) throws
-    NoSuchObjectException, MetaException, TException {
-    client.drop_constraint(new DropConstraintRequest(dbName, tableName, constraintName));
-  }
-
-  @Override
-  public void addPrimaryKey(List<SQLPrimaryKey> primaryKeyCols) throws
-    NoSuchObjectException, MetaException, TException {
-    client.add_primary_key(new AddPrimaryKeyRequest(primaryKeyCols));
-  }
-
-  @Override
-  public void addForeignKey(List<SQLForeignKey> foreignKeyCols) throws
-    NoSuchObjectException, MetaException, TException {
-    client.add_foreign_key(new AddForeignKeyRequest(foreignKeyCols));
-  }
-
-  @Override
-  public void addUniqueConstraint(List<SQLUniqueConstraint> uniqueConstraintCols) throws
-    NoSuchObjectException, MetaException, TException {
-    client.add_unique_constraint(new AddUniqueConstraintRequest(uniqueConstraintCols));
-  }
-
-  @Override
-  public void addNotNullConstraint(List<SQLNotNullConstraint> notNullConstraintCols) throws
-    NoSuchObjectException, MetaException, TException {
-    client.add_not_null_constraint(new AddNotNullConstraintRequest(notNullConstraintCols));
-  }
-
-  /**
-   * @param type
-   * @return true or false
-   * @throws AlreadyExistsException
-   * @throws InvalidObjectException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#create_type(org.apache.hadoop.hive.metastore.api.Type)
-   */
-  public boolean createType(Type type) throws AlreadyExistsException,
-      InvalidObjectException, MetaException, TException {
-    return client.create_type(type);
-  }
-
-  /**
-   * @param name
-   * @throws NoSuchObjectException
-   * @throws InvalidOperationException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#drop_database(java.lang.String, boolean, boolean)
-   */
-  @Override
-  public void dropDatabase(String name)
-      throws NoSuchObjectException, InvalidOperationException, MetaException, TException {
-    dropDatabase(name, true, false, false);
-  }
-
-  @Override
-  public void dropDatabase(String name, boolean deleteData, boolean ignoreUnknownDb)
-      throws NoSuchObjectException, InvalidOperationException, MetaException, TException {
-    dropDatabase(name, deleteData, ignoreUnknownDb, false);
-  }
-
-  @Override
-  public void dropDatabase(String name, boolean deleteData, boolean ignoreUnknownDb, boolean cascade)
-      throws NoSuchObjectException, InvalidOperationException, MetaException, TException {
-    try {
-      getDatabase(name);
-    } catch (NoSuchObjectException e) {
-      if (!ignoreUnknownDb) {
-        throw e;
-      }
-      return;
-    }
-
-    if (cascade) {
-       List<String> tableList = getAllTables(name);
-       for (String table : tableList) {
-         try {
-           // Subclasses can override this step (for example, for temporary tables)
-           dropTable(name, table, deleteData, true);
-         } catch (UnsupportedOperationException e) {
-           // Ignore Index tables, those will be dropped with parent tables
-         }
-        }
-    }
-    client.drop_database(name, deleteData, cascade);
-  }
-
-  /**
-   * @param tbl_name
-   * @param db_name
-   * @param part_vals
-   * @return true or false
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#drop_partition(java.lang.String,
-   *      java.lang.String, java.util.List, boolean)
-   */
-  public boolean dropPartition(String db_name, String tbl_name,
-      List<String> part_vals) throws NoSuchObjectException, MetaException,
-      TException {
-    return dropPartition(db_name, tbl_name, part_vals, true, null);
-  }
-
-  public boolean dropPartition(String db_name, String tbl_name, List<String> part_vals,
-      EnvironmentContext env_context) throws NoSuchObjectException, MetaException, TException {
-    return dropPartition(db_name, tbl_name, part_vals, true, env_context);
-  }
-
-  @Override
-  public boolean dropPartition(String dbName, String tableName, String partName, boolean deleteData)
-      throws NoSuchObjectException, MetaException, TException {
-    return dropPartition(dbName, tableName, partName, deleteData, null);
-  }
-
-  private static EnvironmentContext getEnvironmentContextWithIfPurgeSet() {
-    Map<String, String> warehouseOptions = new HashMap<String, String>();
-    warehouseOptions.put("ifPurge", "TRUE");
-    return new EnvironmentContext(warehouseOptions);
-  }
-
-  /*
-  public boolean dropPartition(String dbName, String tableName, String partName, boolean deleteData, boolean ifPurge)
-      throws NoSuchObjectException, MetaException, TException {
-
-    return dropPartition(dbName, tableName, partName, deleteData,
-                         ifPurge? getEnvironmentContextWithIfPurgeSet() : null);
-  }
-  */
-
-  public boolean dropPartition(String dbName, String tableName, String partName, boolean deleteData,
-      EnvironmentContext envContext) throws NoSuchObjectException, MetaException, TException {
-    return client.drop_partition_by_name_with_environment_context(dbName, tableName, partName,
-        deleteData, envContext);
-  }
-
-  /**
-   * @param db_name
-   * @param tbl_name
-   * @param part_vals
-   * @param deleteData
-   *          delete the underlying data or just delete the table in metadata
-   * @return true or false
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#drop_partition(java.lang.String,
-   *      java.lang.String, java.util.List, boolean)
-   */
-  @Override
-  public boolean dropPartition(String db_name, String tbl_name,
-      List<String> part_vals, boolean deleteData) throws NoSuchObjectException,
-      MetaException, TException {
-    return dropPartition(db_name, tbl_name, part_vals, deleteData, null);
-  }
-
-  @Override
-  public boolean dropPartition(String db_name, String tbl_name,
-      List<String> part_vals, PartitionDropOptions options) throws TException {
-    return dropPartition(db_name, tbl_name, part_vals, options.deleteData,
-                         options.purgeData? getEnvironmentContextWithIfPurgeSet() : null);
-  }
-
-  public boolean dropPartition(String db_name, String tbl_name, List<String> part_vals,
-      boolean deleteData, EnvironmentContext envContext) throws NoSuchObjectException,
-      MetaException, TException {
-    return client.drop_partition_with_environment_context(db_name, tbl_name, part_vals, deleteData,
-        envContext);
-  }
-
-  @Override
-  public List<Partition> dropPartitions(String dbName, String tblName,
-                                        List<ObjectPair<Integer, byte[]>> partExprs, PartitionDropOptions options)
-      throws TException {
-    RequestPartsSpec rps = new RequestPartsSpec();
-    List<DropPartitionsExpr> exprs = new ArrayList<DropPartitionsExpr>(partExprs.size());
-    for (ObjectPair<Integer, byte[]> partExpr : partExprs) {
-      DropPartitionsExpr dpe = new DropPartitionsExpr();
-      dpe.setExpr(partExpr.getSecond());
-      dpe.setPartArchiveLevel(partExpr.getFirst());
-      exprs.add(dpe);
-    }
-    rps.setExprs(exprs);
-    DropPartitionsRequest req = new DropPartitionsRequest(dbName, tblName, rps);
-    req.setDeleteData(options.deleteData);
-    req.setNeedResult(options.returnResults);
-    req.setIfExists(options.ifExists);
-    if (options.purgeData) {
-      LOG.info("Dropped partitions will be purged!");
-      req.setEnvironmentContext(getEnvironmentContextWithIfPurgeSet());
-    }
-    return client.drop_partitions_req(req).getPartitions();
-  }
-
-  @Override
-  public List<Partition> dropPartitions(String dbName, String tblName,
-      List<ObjectPair<Integer, byte[]>> partExprs, boolean deleteData,
-      boolean ifExists, boolean needResult) throws NoSuchObjectException, MetaException, TException {
-
-    return dropPartitions(dbName, tblName, partExprs,
-                          PartitionDropOptions.instance()
-                                              .deleteData(deleteData)
-                                              .ifExists(ifExists)
-                                              .returnResults(needResult));
-
-  }
-
-  @Override
-  public List<Partition> dropPartitions(String dbName, String tblName,
-      List<ObjectPair<Integer, byte[]>> partExprs, boolean deleteData,
-      boolean ifExists) throws NoSuchObjectException, MetaException, TException {
-    // By default, we need the results from dropPartitions();
-    return dropPartitions(dbName, tblName, partExprs,
-                          PartitionDropOptions.instance()
-                                              .deleteData(deleteData)
-                                              .ifExists(ifExists));
-  }
-
-  /**
-   * {@inheritDoc}
-   * @see #dropTable(String, String, boolean, boolean, EnvironmentContext)
-   */
-  @Override
-  public void dropTable(String dbname, String name, boolean deleteData,
-      boolean ignoreUnknownTab) throws MetaException, TException,
-      NoSuchObjectException, UnsupportedOperationException {
-    dropTable(dbname, name, deleteData, ignoreUnknownTab, null);
-  }
-
-  /**
-   * Drop the table and choose whether to save the data in the trash.
-   * @param ifPurge completely purge the table (skipping trash) while removing
-   *                data from warehouse
-   * @see #dropTable(String, String, boolean, boolean, EnvironmentContext)
-   */
-  @Override
-  public void dropTable(String dbname, String name, boolean deleteData,
-      boolean ignoreUnknownTab, boolean ifPurge)
-      throws MetaException, TException, NoSuchObjectException, UnsupportedOperationException {
-    //build new environmentContext with ifPurge;
-    EnvironmentContext envContext = null;
-    if(ifPurge){
-      Map<String, String> warehouseOptions = null;
-      warehouseOptions = new HashMap<String, String>();
-      warehouseOptions.put("ifPurge", "TRUE");
-      envContext = new EnvironmentContext(warehouseOptions);
-    }
-    dropTable(dbname, name, deleteData, ignoreUnknownTab, envContext);
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  @Deprecated
-  public void dropTable(String tableName, boolean deleteData)
-      throws MetaException, UnknownTableException, TException, NoSuchObjectException {
-    dropTable(DEFAULT_DATABASE_NAME, tableName, deleteData, false, null);
-  }
-
-  /**
-   * @see #dropTable(String, String, boolean, boolean, EnvironmentContext)
-   */
-  @Override
-  public void dropTable(String dbname, String name)
-      throws NoSuchObjectException, MetaException, TException {
-    dropTable(dbname, name, true, true, null);
-  }
-
-  /**
-   * Drop the table and choose whether to: delete the underlying table data;
-   * throw if the table doesn't exist; save the data in the trash.
-   *
-   * @param dbname
-   * @param name
-   * @param deleteData
-   *          delete the underlying data or just delete the table in metadata
-   * @param ignoreUnknownTab
-   *          don't throw if the requested table doesn't exist
-   * @param envContext
-   *          for communicating with thrift
-   * @throws MetaException
-   *           could not drop table properly
-   * @throws NoSuchObjectException
-   *           the table wasn't found
-   * @throws TException
-   *           a thrift communication error occurred
-   * @throws UnsupportedOperationException
-   *           dropping an index table is not allowed
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#drop_table(java.lang.String,
-   *      java.lang.String, boolean)
-   */
-  public void dropTable(String dbname, String name, boolean deleteData,
-      boolean ignoreUnknownTab, EnvironmentContext envContext) throws MetaException, TException,
-      NoSuchObjectException, UnsupportedOperationException {
-    Table tbl;
-    try {
-      tbl = getTable(dbname, name);
-    } catch (NoSuchObjectException e) {
-      if (!ignoreUnknownTab) {
-        throw e;
-      }
-      return;
-    }
-    if (isIndexTable(tbl)) {
-      throw new UnsupportedOperationException("Cannot drop index tables");
-    }
-    HiveMetaHook hook = getHook(tbl);
-    if (hook != null) {
-      hook.preDropTable(tbl);
-    }
-    boolean success = false;
-    try {
-      drop_table_with_environment_context(dbname, name, deleteData, envContext);
-      if (hook != null) {
-        hook.commitDropTable(tbl, deleteData || (envContext != null && "TRUE".equals(envContext.getProperties().get("ifPurge"))));
-      }
-      success=true;
-    } catch (NoSuchObjectException e) {
-      if (!ignoreUnknownTab) {
-        throw e;
-      }
-    } finally {
-      if (!success && (hook != null)) {
-        hook.rollbackDropTable(tbl);
-      }
-    }
-  }
-
-  /**
-   * Truncate the table/partitions in the DEFAULT database.
-   * @param dbName
-   *          The db to which the table to be truncate belongs to
-   * @param tableName
-   *          The table to truncate
-   * @param partNames
-   *          List of partitions to truncate. NULL will truncate the whole table/all partitions
-   * @throws MetaException
-   * @throws TException
-   *           Could not truncate table properly.
-   */
-  @Override
-  public void truncateTable(String dbName, String tableName, List<String> partNames) throws MetaException, TException {
-    client.truncate_table(dbName, tableName, partNames);
-  }
-
-  /**
-   * Recycles the files recursively from the input path to the cmroot directory either by copying or moving it.
-   *
-   * @param request Inputs for path of the data files to be recycled to cmroot and
-   *                isPurge flag when set to true files which needs to be recycled are not moved to Trash
-   * @return Response which is currently void
-   */
-  @Override
-  public CmRecycleResponse recycleDirToCmPath(CmRecycleRequest request) throws MetaException, TException {
-    return client.cm_recycle(request);
-  }
-
-  /**
-   * @param type
-   * @return true if the type is dropped
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#drop_type(java.lang.String)
-   */
-  public boolean dropType(String type) throws NoSuchObjectException, MetaException, TException {
-    return client.drop_type(type);
-  }
-
-  /**
-   * @param name
-   * @return map of types
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_type_all(java.lang.String)
-   */
-  public Map<String, Type> getTypeAll(String name) throws MetaException,
-      TException {
-    Map<String, Type> result = null;
-    Map<String, Type> fromClient = client.get_type_all(name);
-    if (fromClient != null) {
-      result = new LinkedHashMap<String, Type>();
-      for (String key : fromClient.keySet()) {
-        result.put(key, deepCopy(fromClient.get(key)));
-      }
-    }
-    return result;
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> getDatabases(String databasePattern)
-    throws MetaException {
-    try {
-      return filterHook.filterDatabases(client.get_databases(databasePattern));
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> getAllDatabases() throws MetaException {
-    try {
-      return filterHook.filterDatabases(client.get_all_databases());
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  /**
-   * @param tbl_name
-   * @param db_name
-   * @param max_parts
-   * @return list of partitions
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   */
-  @Override
-  public List<Partition> listPartitions(String db_name, String tbl_name,
-      short max_parts) throws NoSuchObjectException, MetaException, TException {
-    List<Partition> parts = client.get_partitions(db_name, tbl_name, max_parts);
-    return fastpath ? parts : deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  @Override
-  public PartitionSpecProxy listPartitionSpecs(String dbName, String tableName, int maxParts) throws TException {
-    return PartitionSpecProxy.Factory.get(filterHook.filterPartitionSpecs(
-        client.get_partitions_pspec(dbName, tableName, maxParts)));
-  }
-
-  @Override
-  public List<Partition> listPartitions(String db_name, String tbl_name,
-      List<String> part_vals, short max_parts)
-      throws NoSuchObjectException, MetaException, TException {
-    List<Partition> parts = client.get_partitions_ps(db_name, tbl_name, part_vals, max_parts);
-    return fastpath ? parts : deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  @Override
-  public List<Partition> listPartitionsWithAuthInfo(String db_name,
-      String tbl_name, short max_parts, String user_name, List<String> group_names)
-       throws NoSuchObjectException, MetaException, TException {
-    List<Partition> parts = client.get_partitions_with_auth(db_name, tbl_name, max_parts,
-        user_name, group_names);
-    return fastpath ? parts :deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  @Override
-  public List<Partition> listPartitionsWithAuthInfo(String db_name,
-      String tbl_name, List<String> part_vals, short max_parts,
-      String user_name, List<String> group_names) throws NoSuchObjectException,
-      MetaException, TException {
-    List<Partition> parts = client.get_partitions_ps_with_auth(db_name,
-        tbl_name, part_vals, max_parts, user_name, group_names);
-    return fastpath ? parts : deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  /**
-   * Get list of partitions matching specified filter
-   * @param db_name the database name
-   * @param tbl_name the table name
-   * @param filter the filter string,
-   *    for example "part1 = \"p1_abc\" and part2 &lt;= "\p2_test\"". Filtering can
-   *    be done only on string partition keys.
-   * @param max_parts the maximum number of partitions to return,
-   *    all partitions are returned if -1 is passed
-   * @return list of partitions
-   * @throws MetaException
-   * @throws NoSuchObjectException
-   * @throws TException
-   */
-  @Override
-  public List<Partition> listPartitionsByFilter(String db_name, String tbl_name,
-      String filter, short max_parts) throws MetaException,
-         NoSuchObjectException, TException {
-    List<Partition> parts = client.get_partitions_by_filter(db_name, tbl_name, filter, max_parts);
-    return fastpath ? parts :deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  @Override
-  public PartitionSpecProxy listPartitionSpecsByFilter(String db_name, String tbl_name,
-                                                       String filter, int max_parts) throws MetaException,
-         NoSuchObjectException, TException {
-    return PartitionSpecProxy.Factory.get(filterHook.filterPartitionSpecs(
-        client.get_part_specs_by_filter(db_name, tbl_name, filter, max_parts)));
-  }
-
-  @Override
-  public boolean listPartitionsByExpr(String db_name, String tbl_name, byte[] expr,
-      String default_partition_name, short max_parts, List<Partition> result)
-          throws TException {
-    assert result != null;
-    PartitionsByExprRequest req = new PartitionsByExprRequest(
-        db_name, tbl_name, ByteBuffer.wrap(expr));
-    if (default_partition_name != null) {
-      req.setDefaultPartitionName(default_partition_name);
-    }
-    if (max_parts >= 0) {
-      req.setMaxParts(max_parts);
-    }
-    PartitionsByExprResult r = null;
-    try {
-      r = client.get_partitions_by_expr(req);
-    } catch (TApplicationException te) {
-      // TODO: backward compat for Hive <= 0.12. Can be removed later.
-      if (te.getType() != TApplicationException.UNKNOWN_METHOD
-          && te.getType() != TApplicationException.WRONG_METHOD_NAME) {
-        throw te;
-      }
-      throw new IncompatibleMetastoreException(
-          "Metastore doesn't support listPartitionsByExpr: " + te.getMessage());
-    }
-    if (fastpath) {
-      result.addAll(r.getPartitions());
-    } else {
-      r.setPartitions(filterHook.filterPartitions(r.getPartitions()));
-      // TODO: in these methods, do we really need to deepcopy?
-      deepCopyPartitions(r.getPartitions(), result);
-    }
-    return !r.isSetHasUnknownPartitions() || r.isHasUnknownPartitions(); // Assume the worst.
-  }
-
-  /**
-   * @param name
-   * @return the database
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_database(java.lang.String)
-   */
-  @Override
-  public Database getDatabase(String name) throws NoSuchObjectException,
-      MetaException, TException {
-    Database d = client.get_database(name);
-    return fastpath ? d :deepCopy(filterHook.filterDatabase(d));
-  }
-
-  /**
-   * @param tbl_name
-   * @param db_name
-   * @param part_vals
-   * @return the partition
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_partition(java.lang.String,
-   *      java.lang.String, java.util.List)
-   */
-  @Override
-  public Partition getPartition(String db_name, String tbl_name,
-      List<String> part_vals) throws NoSuchObjectException, MetaException, TException {
-    Partition p = client.get_partition(db_name, tbl_name, part_vals);
-    return fastpath ? p : deepCopy(filterHook.filterPartition(p));
-  }
-
-  @Override
-  public List<Partition> getPartitionsByNames(String db_name, String tbl_name,
-      List<String> part_names) throws NoSuchObjectException, MetaException, TException {
-    List<Partition> parts = client.get_partitions_by_names(db_name, tbl_name, part_names);
-    return fastpath ? parts : deepCopyPartitions(filterHook.filterPartitions(parts));
-  }
-
-  @Override
-  public PartitionValuesResponse listPartitionValues(PartitionValuesRequest request)
-      throws MetaException, TException, NoSuchObjectException {
-    return client.get_partition_values(request);
-  }
-
-  @Override
-  public Partition getPartitionWithAuthInfo(String db_name, String tbl_name,
-      List<String> part_vals, String user_name, List<String> group_names)
-      throws MetaException, UnknownTableException, NoSuchObjectException,
-      TException {
-    Partition p = client.get_partition_with_auth(db_name, tbl_name, part_vals, user_name,
-        group_names);
-    return fastpath ? p : deepCopy(filterHook.filterPartition(p));
-  }
-
-  /**
-   * @param name
-   * @param dbname
-   * @return the table
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   * @throws NoSuchObjectException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_table(java.lang.String,
-   *      java.lang.String)
-   */
-  @Override
-  public Table getTable(String dbname, String name) throws MetaException,
-      TException, NoSuchObjectException {
-    GetTableRequest req = new GetTableRequest(dbname, name);
-    req.setCapabilities(version);
-    Table t = client.get_table_req(req).getTable();
-    return fastpath ? t : deepCopy(filterHook.filterTable(t));
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  @Deprecated
-  public Table getTable(String tableName) throws MetaException, TException,
-      NoSuchObjectException {
-    Table t = getTable(DEFAULT_DATABASE_NAME, tableName);
-    return fastpath ? t : filterHook.filterTable(t);
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<Table> getTableObjectsByName(String dbName, List<String> tableNames)
-      throws MetaException, InvalidOperationException, UnknownDBException, TException {
-    GetTablesRequest req = new GetTablesRequest(dbName);
-    req.setTblNames(tableNames);
-    req.setCapabilities(version);
-    List<Table> tabs = client.get_table_objects_by_name_req(req).getTables();
-    return fastpath ? tabs : deepCopyTables(filterHook.filterTables(tabs));
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> listTableNamesByFilter(String dbName, String filter, short maxTables)
-      throws MetaException, TException, InvalidOperationException, UnknownDBException {
-    return filterHook.filterTableNames(dbName,
-        client.get_table_names_by_filter(dbName, filter, maxTables));
-  }
-
-  /**
-   * @param name
-   * @return the type
-   * @throws MetaException
-   * @throws TException
-   * @throws NoSuchObjectException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_type(java.lang.String)
-   */
-  public Type getType(String name) throws NoSuchObjectException, MetaException, TException {
-    return deepCopy(client.get_type(name));
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> getTables(String dbname, String tablePattern) throws MetaException {
-    try {
-      return filterHook.filterTableNames(dbname, client.get_tables(dbname, tablePattern));
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> getTables(String dbname, String tablePattern, TableType tableType) throws MetaException {
-    try {
-      return filterHook.filterTableNames(dbname, client.get_tables_by_type(dbname, tablePattern, tableType.toString()));
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  @Override
-  public List<TableMeta> getTableMeta(String dbPatterns, String tablePatterns, List<String> tableTypes)
-      throws MetaException {
-    try {
-      return filterNames(client.get_table_meta(dbPatterns, tablePatterns, tableTypes));
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  private List<TableMeta> filterNames(List<TableMeta> metas) throws MetaException {
-    Map<String, TableMeta> sources = new LinkedHashMap<>();
-    Map<String, List<String>> dbTables = new LinkedHashMap<>();
-    for (TableMeta meta : metas) {
-      sources.put(meta.getDbName() + "." + meta.getTableName(), meta);
-      List<String> tables = dbTables.get(meta.getDbName());
-      if (tables == null) {
-        dbTables.put(meta.getDbName(), tables = new ArrayList<String>());
-      }
-      tables.add(meta.getTableName());
-    }
-    List<TableMeta> filtered = new ArrayList<>();
-    for (Map.Entry<String, List<String>> entry : dbTables.entrySet()) {
-      for (String table : filterHook.filterTableNames(entry.getKey(), entry.getValue())) {
-        filtered.add(sources.get(entry.getKey() + "." + table));
-      }
-    }
-    return filtered;
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<String> getAllTables(String dbname) throws MetaException {
-    try {
-      return filterHook.filterTableNames(dbname, client.get_all_tables(dbname));
-    } catch (Exception e) {
-      MetaStoreUtils.logAndThrowMetaException(e);
-    }
-    return null;
-  }
-
-  @Override
-  public boolean tableExists(String databaseName, String tableName) throws MetaException,
-      TException, UnknownDBException {
-    try {
-      GetTableRequest req = new GetTableRequest(databaseName, tableName);
-      req.setCapabilities(version);
-      return filterHook.filterTable(client.get_table_req(req).getTable()) != null;
-    } catch (NoSuchObjectException e) {
-      return false;
-    }
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  @Deprecated
-  public boolean tableExists(String tableName) throws MetaException,
-      TException, UnknownDBException {
-    return tableExists(DEFAULT_DATABASE_NAME, tableName);
-  }
-
-  @Override
-  public List<String> listPartitionNames(String dbName, String tblName,
-      short max) throws NoSuchObjectException, MetaException, TException {
-    return filterHook.filterPartitionNames(dbName, tblName,
-        client.get_partition_names(dbName, tblName, max));
-  }
-
-  @Override
-  public List<String> listPartitionNames(String db_name, String tbl_name,
-      List<String> part_vals, short max_parts)
-      throws MetaException, TException, NoSuchObjectException {
-    return filterHook.filterPartitionNames(db_name, tbl_name,
-        client.get_partition_names_ps(db_name, tbl_name, part_vals, max_parts));
-  }
-
-  /**
-   * Get number of partitions matching specified filter
-   * @param db_name the database name
-   * @param tbl_name the table name
-   * @param filter the filter string,
-   *    for example "part1 = \"p1_abc\" and part2 &lt;= "\p2_test\"". Filtering can
-   *    be done only on string partition keys.
-   * @return number of partitions
-   * @throws MetaException
-   * @throws NoSuchObjectException
-   * @throws TException
-   */
-  @Override
-  public int getNumPartitionsByFilter(String db_name, String tbl_name,
-                                      String filter) throws MetaException,
-          NoSuchObjectException, TException {
-    return client.get_num_partitions_by_filter(db_name, tbl_name, filter);
-  }
-
-  @Override
-  public void alter_partition(String dbName, String tblName, Partition newPart)
-      throws InvalidOperationException, MetaException, TException {
-    client.alter_partition_with_environment_context(dbName, tblName, newPart, null);
-  }
-
-  @Override
-  public void alter_partition(String dbName, String tblName, Partition newPart, EnvironmentContext environmentContext)
-      throws InvalidOperationException, MetaException, TException {
-    client.alter_partition_with_environment_context(dbName, tblName, newPart, environmentContext);
-  }
-
-  @Override
-  public void alter_partitions(String dbName, String tblName, List<Partition> newParts)
-      throws InvalidOperationException, MetaException, TException {
-    client.alter_partitions_with_environment_context(dbName, tblName, newParts, null);
-  }
-
-  @Override
-  public void alter_partitions(String dbName, String tblName, List<Partition> newParts, EnvironmentContext environmentContext)
-  throws InvalidOperationException, MetaException, TException {
-    client.alter_partitions_with_environment_context(dbName, tblName, newParts, environmentContext);
-}
-
-  @Override
-  public void alterDatabase(String dbName, Database db)
-      throws MetaException, NoSuchObjectException, TException {
-    client.alter_database(dbName, db);
-  }
-  /**
-   * @param db
-   * @param tableName
-   * @throws UnknownTableException
-   * @throws UnknownDBException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_fields(java.lang.String,
-   *      java.lang.String)
-   */
-  @Override
-  public List<FieldSchema> getFields(String db, String tableName)
-      throws MetaException, TException, UnknownTableException,
-      UnknownDBException {
-    List<FieldSchema> fields = client.get_fields(db, tableName);
-    return fastpath ? fields : deepCopyFieldSchemas(fields);
-  }
-
-  /**
-   * create an index
-   * @param index the index object
-   * @param indexTable which stores the index data
-   * @throws InvalidObjectException
-   * @throws MetaException
-   * @throws NoSuchObjectException
-   * @throws TException
-   * @throws AlreadyExistsException
-   */
-  @Override
-  public void createIndex(Index index, Table indexTable) throws AlreadyExistsException, InvalidObjectException, MetaException, NoSuchObjectException, TException {
-    client.add_index(index, indexTable);
-  }
-
-  /**
-   * @param dbname
-   * @param base_tbl_name
-   * @param idx_name
-   * @param new_idx
-   * @throws InvalidOperationException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#alter_index(java.lang.String,
-   *      java.lang.String, java.lang.String, org.apache.hadoop.hive.metastore.api.Index)
-   */
-  @Override
-  public void alter_index(String dbname, String base_tbl_name, String idx_name, Index new_idx)
-      throws InvalidOperationException, MetaException, TException {
-    client.alter_index(dbname, base_tbl_name, idx_name, new_idx);
-  }
-
-  /**
-   * @param dbName
-   * @param tblName
-   * @param indexName
-   * @return the index
-   * @throws MetaException
-   * @throws UnknownTableException
-   * @throws NoSuchObjectException
-   * @throws TException
-   */
-  @Override
-  public Index getIndex(String dbName, String tblName, String indexName)
-      throws MetaException, UnknownTableException, NoSuchObjectException,
-      TException {
-    return deepCopy(filterHook.filterIndex(client.get_index_by_name(dbName, tblName, indexName)));
-  }
-
-  /**
-   * list indexes of the give base table
-   * @param dbName
-   * @param tblName
-   * @param max
-   * @return the list of indexes
-   * @throws NoSuchObjectException
-   * @throws MetaException
-   * @throws TException
-   */
-  @Override
-  public List<String> listIndexNames(String dbName, String tblName, short max)
-      throws MetaException, TException {
-    return filterHook.filterIndexNames(dbName, tblName, client.get_index_names(dbName, tblName, max));
-  }
-
-  /**
-   * list all the index names of the give base table.
-   *
-   * @param dbName
-   * @param tblName
-   * @param max
-   * @return list of indexes
-   * @throws MetaException
-   * @throws TException
-   */
-  @Override
-  public List<Index> listIndexes(String dbName, String tblName, short max)
-      throws NoSuchObjectException, MetaException, TException {
-    return filterHook.filterIndexes(client.get_indexes(dbName, tblName, max));
-  }
-
-  @Override
-  public List<SQLPrimaryKey> getPrimaryKeys(PrimaryKeysRequest req)
-    throws MetaException, NoSuchObjectException, TException {
-    return client.get_primary_keys(req).getPrimaryKeys();
-  }
-
-  @Override
-  public List<SQLForeignKey> getForeignKeys(ForeignKeysRequest req) throws MetaException,
-    NoSuchObjectException, TException {
-    return client.get_foreign_keys(req).getForeignKeys();
-  }
-
-  @Override
-  public List<SQLUniqueConstraint> getUniqueConstraints(UniqueConstraintsRequest req)
-    throws MetaException, NoSuchObjectException, TException {
-    return client.get_unique_constraints(req).getUniqueConstraints();
-  }
-
-  @Override
-  public List<SQLNotNullConstraint> getNotNullConstraints(NotNullConstraintsRequest req)
-    throws MetaException, NoSuchObjectException, TException {
-    return client.get_not_null_constraints(req).getNotNullConstraints();
-  }
-
-
-  /** {@inheritDoc} */
-  @Override
-  @Deprecated
-  //use setPartitionColumnStatistics instead
-  public boolean updateTableColumnStatistics(ColumnStatistics statsObj)
-    throws NoSuchObjectException, InvalidObjectException, MetaException, TException,
-    InvalidInputException{
-    return client.update_table_column_statistics(statsObj);
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  @Deprecated
-  //use setPartitionColumnStatistics instead
-  public boolean updatePartitionColumnStatistics(ColumnStatistics statsObj)
-    throws NoSuchObjectException, InvalidObjectException, MetaException, TException,
-    InvalidInputException{
-    return client.update_partition_column_statistics(statsObj);
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public boolean setPartitionColumnStatistics(SetPartitionsStatsRequest request)
-    throws NoSuchObjectException, InvalidObjectException, MetaException, TException,
-    InvalidInputException{
-    return client.set_aggr_stats_for(request);
-  }
-
-  @Override
-  public void flushCache() {
-    try {
-      client.flushCache();
-    } catch (TException e) {
-      // Not much we can do about it honestly
-      LOG.warn("Got error flushing the cache", e);
-    }
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public List<ColumnStatisticsObj> getTableColumnStatistics(String dbName, String tableName,
-      List<String> colNames) throws NoSuchObjectException, MetaException, TException,
-      InvalidInputException, InvalidObjectException {
-    return client.get_table_statistics_req(
-        new TableStatsRequest(dbName, tableName, colNames)).getTableStats();
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public Map<String, List<ColumnStatisticsObj>> getPartitionColumnStatistics(
-      String dbName, String tableName, List<String> partNames, List<String> colNames)
-          throws NoSuchObjectException, MetaException, TException {
-    return client.get_partitions_statistics_req(
-        new PartitionsStatsRequest(dbName, tableName, colNames, partNames)).getPartStats();
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public boolean deletePartitionColumnStatistics(String dbName, String tableName, String partName,
-    String colName) throws NoSuchObjectException, InvalidObjectException, MetaException,
-    TException, InvalidInputException
-  {
-    return client.delete_partition_column_statistics(dbName, tableName, partName, colName);
-  }
-
-  /** {@inheritDoc} */
-  @Override
-  public boolean deleteTableColumnStatistics(String dbName, String tableName, String colName)
-    throws NoSuchObjectException, InvalidObjectException, MetaException, TException,
-    InvalidInputException
-  {
-    return client.delete_table_column_statistics(dbName, tableName, colName);
-  }
-
-  /**
-   * @param db
-   * @param tableName
-   * @throws UnknownTableException
-   * @throws UnknownDBException
-   * @throws MetaException
-   * @throws TException
-   * @see org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore.Iface#get_schema(java.lang.String,
-   *      java.lang.String)
-   */
-  @Override
-  public List<FieldSchema> getSchema(String db, String tableName)
-      throws MetaException, TException, UnknownTableException,
-      UnknownDBException {
-      EnvironmentContext envCxt = null;
-      String addedJars = conf.getVar(ConfVars.HIVEADDEDJARS);
-      if(org.apache.commons.lang.StringUtils.isNotBlank(addedJars)) {
-         Map<String, String> props = new HashMap<String, String>();
-         props.put("hive.added.jars.path", addedJars);
-         envCxt = new EnvironmentContext(props);
-       }
-
-    List<FieldSchema> fields = client.get_schema_with_environment_context(db, tableName, envCxt);
-    return fastpath ? fields : deepCopyFieldSchemas(fields);
-  }
-
-  @Override
-  public String getConfigValue(String name, String defaultValue)
-      throws TException, ConfigValSecurityException {
-    return client.get_config_value(name, defaultValue);
-  }
-
-  @Override
-  public Partition getPartition(String db, String tableName, String partName)
-      throws MetaException, TException, UnknownTableException, NoSuchObjectException {
-    Partition p = client.get_partition_by_name(db, tableName, partName);
-    return fastpath ? p : deepCopy(filterHook.filterPartition(p));
-  }
-
-  public Partition appendPartitionByName(String dbName, String tableName, String partName)
-      throws InvalidObjectException, AlreadyExistsException, MetaException, TException {
-    return appendPartitionByName(dbName, tableName, partName, null);
-  }
-
-  public Partition appendPartitionByName(String dbName, String tableName, String partName,
-      EnvironmentContext envContext) throws InvalidObjectException, AlreadyExistsException,
-      MetaException, TException {
-    Partition p = client.append_partition_by_name_with_environment_context(dbName, tableName,
-        partName, envContext);
-    return fastpath ? p : deepCopy(p);
-  }
-
-  public boolean dropPartitionByName(String dbName, String tableName, String partName,
-      boolean deleteData) throws NoSuchObjectException, MetaException, TException {
-    return dropPartitionByName(dbName, tableName, partName, deleteData, null);
-  }
-
-  public boolean dropPartitionByName(String dbName, String tableName, String partName,
-      boolean deleteData, EnvironmentContext envContext) throws NoSuchObjectException,
-      MetaException, TException {
-    return client.drop_partition_by_name_with_environment_context(dbName, tableName, partName,
-        deleteData, envContext);
-  }
-
-  private HiveMetaHook getHook(Table tbl) throws MetaException {
-    if (hookLoader == null) {
-      return null;
-    }
-    return hookLoader.getHook(tbl);
-  }
-
-  @Override
-  public List<String> partitionNameToVals(String name) throws MetaException, TException {
-    return client.partition_name_to_vals(name);
-  }
-
-  @Override
-  public Map<String, String> partitionNameToSpec(String name) throws MetaException, TException{
-    return client.partition_name_to_spec(name);
-  }
-
-  /**
-   * @param partition
-   * @return
-   */
-  private Partition deepCopy(Partition partition) {
-    Partition copy = null;
-    if (partition != null) {
-      copy = new Partition(partition);
-    }
-    return copy;
-  }
-
-  private Database deepCopy(Database database) {
-    Database copy = null;
-    if (database != null) {
-      copy = new Database(database);
-    }
-    return copy;
-  }
-
-  protected Table deepCopy(Table table) {
-    Table copy = null;
-    if (table != null) {
-      copy = new Table(table);
-    }
-    return copy;
-  }
-
-  private Index deepCopy(Index index) {
-    Index copy = null;
-    if (index != null) {
-      copy = new Index(index);
-    }
-    return copy;
-  }
-
-  private Type deepCopy(Type type) {
-    Type copy = null;
-    if (type != null) {
-      copy = new Type(type);
-    }
-    return copy;
-  }
-
-  private FieldSchema deepCopy(FieldSchema schema) {
-    FieldSchema copy = null;
-    if (schema != null) {
-      copy = new FieldSchema(schema);
-    }
-    return copy;
-  }
-
-  private Function deepCopy(Function func) {
-    Function copy = null;
-    if (func != null) {
-      copy = new Function(func);
-    }
-    return copy;
-  }
-
-  protected PrincipalPrivilegeSet deepCopy(PrincipalPrivilegeSet pps) {
-    PrincipalPrivilegeSet copy = null;
-    if (pps != null) {
-      copy = new PrincipalPrivilegeSet(pps);
-    }
-    return copy;
-  }
-
-  private List<Partition> deepCopyPartitions(List<Partition> partitions) {
-    return deepCopyPartitions(partitions, null);
-  }
-
-  private List<Partition> deepCopyPartitions(
-      Collection<Partition> src, List<Partition> dest) {
-    if (src == null) {
-      return dest;
-    }
-    if (dest == null) {
-      dest = new ArrayList<Partition>(src.size());
-    }
-    for (Partition part : src) {
-      dest.add(deepCopy(part));
-    }
-    return dest;
-  }
-
-  private List<Table> deepCopyTables(List<Table> tables) {
-    List<Table> copy = null;
-    if (tables != null) {
-      copy = new ArrayList<Table>();
-      for (Table tab : tables) {
-        copy.add(deepCopy(tab));
-      }
-    }
-    return copy;
-  }
-
-  protected List<FieldSchema> deepCopyFieldSchemas(List<FieldSchema> schemas) {
-    List<FieldSchema> copy = null;
-    if (schemas != null) {
-      copy = new ArrayList<FieldSchema>();
-      for (FieldSchema schema : schemas) {
-        copy.add(deepCopy(schema));
-      }
-    }
-    return copy;
-  }
-
-  @Override
-  public boolean dropIndex(String dbName, String tblName, String name,
-      boolean deleteData) throws NoSuchObjectException, MetaException,
-      TException {
-    return client.drop_index_by_name(dbName, tblName, name, deleteData);
-  }
-
-  @Override
-  public boolean grant_role(String roleName, String userName,
-      PrincipalType principalType, String grantor, PrincipalType grantorType,
-      boolean grantOption) throws MetaException, TException {
-    GrantRevokeRoleRequest req = new GrantRevokeRoleRequest();
-    req.setRequestType(GrantRevokeType.GRANT);
-    req.setRoleName(roleName);
-    req.setPrincipalName(userName);
-    req.setPrincipalType(principalType);
-    req.setGrantor(grantor);
-    req.setGrantorType(grantorType);
-    req.setGrantOption(grantOption);
-    GrantRevokeRoleResponse res = client.grant_revoke_role(req);
-    if (!res.isSetSuccess()) {
-      throw new MetaException("GrantRevokeResponse missing success field");
-    }
-    return res.isSuccess();
-  }
-
-  @Override
-  public boolean create_role(Role role)
-      throws MetaException, TException {
-    return client.create_role(role);
-  }
-
-  @Override
-  public boolean drop_role(String roleName) throws MetaException, TException {
-    return client.drop_role(roleName);
-  }
-
-  @Override
-  public List<Role> list_roles(String principalName,
-      PrincipalType principalType) throws MetaException, TException {
-    return client.list_roles(principalName, principalType);
-  }
-
-  @Override
-  public List<String> listRoleNames() throws MetaException, TException {
-    return client.get_role_names();
-  }
-
-  @Override
-  public GetPrincipalsInRoleResponse get_principals_in_role(GetPrincipalsInRoleRequest req)
-      throws MetaException, TException {
-    return client.get_principals_in_role(req);
-  }
-
-  @Override
-  public GetRoleGrantsForPrincipalResponse get_role_grants_for_principal(
-      GetRoleGrantsForPrincipalRequest getRolePrincReq) throws MetaException, TException {
-    return client.get_role_grants_for_principal(getRolePrincReq);
-  }
-
-  @Override
-  public boolean grant_privileges(PrivilegeBag privileges)
-      throws MetaException, TException {
-    GrantRevokePrivilegeRequest req = new GrantRevokePrivilegeRequest();
-    req.setRequestType(GrantRevokeType.GRANT);
-    req.setPrivileges(privileges);
-    GrantRevokePrivilegeResponse res = client.grant_revoke_privileges(req);
-    if (!res.isSetSuccess()) {
-      throw new MetaException("GrantRevokePrivilegeResponse missing success field");
-    }
-    return res.isSuccess();
-  }
-
-  @Override
-  public boolean revoke_role(String roleName, String userName,
-      PrincipalType principalType, boolean grantOption) throws MetaException, TException {
-    GrantRevokeRoleRequest req = new GrantRevokeRoleRequest();
-    req.setRequestType(GrantRevokeType.REVOKE);
-    req.setRoleName(roleName);
-    req.setPrincipalName(userName);
-    req.setPrincipalType(principalType);
-    req.setGrantOption(grantOption);
-    GrantRevokeRoleResponse res = client.grant_revoke_role(req);
-    if (!res.isSetSuccess()) {
-      throw new MetaException("GrantRevokeResponse missing success field");
-    }
-    return res.isSuccess();
-  }
-
-  @Override
-  public boolean revoke_privileges(PrivilegeBag privileges, boolean grantOption) throws MetaException,
-      TException {
-    GrantRevokePrivilegeRequest req = new GrantRevokePrivilegeRequest();
-    req.setRequestType(GrantRevokeType.REVOKE);
-    req.setPrivileges(privileges);
-    req.setRevokeGrantOption(grantOption);
-    GrantRevokePrivilegeResponse res = client.grant_revoke_privileges(req);
-    if (!res.isSetSuccess()) {
-      throw new MetaException("GrantRevokePrivilegeResponse missing success field");
-    }
-    return res.isSuccess();
-  }
-
-  @Override
-  public PrincipalPrivilegeSet get_privilege_set(HiveObjectRef hiveObject,
-      String userName, List<String> groupNames) throws MetaException,
-      TException {
-    return client.get_privilege_set(hiveObject, userName, groupNames);
-  }
-
-  @Override
-  public List<HiveObjectPrivilege> list_privileges(String principalName,
-      PrincipalType principalType, HiveObjectRef hiveObject)
-      throws MetaException, TException {
-    return client.list_privileges(principalName, principalType, hiveObject);
-  }
-
-  public String getDelegationToken(String renewerKerberosPrincipalName) throws
-  MetaException, TException, IOException {
-    //a convenience method that makes the intended owner for the delegation
-    //token request the current user
-    String owner = conf.getUser();
-    return getDelegationToken(owner, renewerKerberosPrincipalName);
-  }
-
-  @Override
-  public String getDelegationToken(String owner, String renewerKerberosPrincipalName) throws
-  MetaException, TException {
-    // This is expected to be a no-op, so we will return null when we use local metastore.
-    if (localMetaStore) {
-      return null;
-    }
-    return client.get_delegation_token(owner, renewerKerberosPrincipalName);
-  }
-
-  @Override
-  public long renewDelegationToken(String tokenStrForm) throws MetaException, TException {
-    if (localMetaStore) {
-      return 0;
-    }
-    return client.renew_delegation_token(tokenStrForm);
-
-  }
-
-  @Override
-  public void cancelDelegationToken(String tokenStrForm) throws MetaException, TException {
-    if (localMetaStore) {
-      return;
-    }
-    client.cancel_delegation_token(tokenStrForm);
-  }
-
-  @Override
-  public boolean addToken(String tokenIdentifier, String delegationToken) throws TException {
-     return client.add_token(tokenIdentifier, delegationToken);
-  }
-
-  @Override
-  public boolean removeToken(String tokenIdentifier) throws TException {
-    return client.remove_token(tokenIdentifier);
-  }
-
-  @Override
-  public String getToken(String tokenIdentifier) throws TException {
-    return client.get_token(tokenIdentifier);
-  }
-
-  @Override
-  public List<String> getAllTokenIdentifiers() throws TException {
-    return client.get_all_token_identifiers();
-  }
-
-  @Override
-  public int addMasterKey(String key) throws MetaException, TException {
-    return client.add_master_key(key);
-  }
-
-  @Override
-  public void updateMasterKey(Integer seqNo, String key)
-      throws NoSuchObjectException, MetaException, TException {
-    client.update_master_key(seqNo, key);
-  }
-
-  @Override
-  public boolean removeMasterKey(Integer keySeq) throws TException {
-    return client.remove_master_key(keySeq);
-  }
-
-  @Override
-  public String[] getMasterKeys() throws TException {
-    List<String> keyList = client.get_master_keys();
-    return keyList.toArray(new String[keyList.size()]);
-  }
-
-  @Override
-  public ValidTxnList getValidTxns() throws TException {
-    return TxnUtils.createValidReadTxnList(client.get_open_txns(), 0);
-  }
-
-  @Override
-  public ValidTxnList getValidTxns(long currentTxn) throws TException {
-    return TxnUtils.createValidReadTxnList(client.get_open_txns(), currentTxn);
-  }
-
-  @Override
-  public long openTxn(String user) throws TException {
-    OpenTxnsResponse txns = openTxns(user, 1);
-    return txns.getTxn_ids().get(0);
-  }
-
-  @Override
-  public OpenTxnsResponse openTxns(String user, int numTxns) throws TException {
-    String hostname = null;
-    try {
-      hostname = InetAddress.getLocalHost().getHostName();
-    } catch (UnknownHostException e) {
-      LOG.error("Unable to resolve my host name " + e.getMessage());
-      throw new RuntimeException(e);
-    }
-    return client.open_txns(new OpenTxnRequest(numTxns, user, hostname));
-  }
-
-  @Override
-  public void rollbackTxn(long txnid) throws NoSuchTxnException, TException {
-    client.abort_txn(new AbortTxnRequest(txnid));
-  }
-
-  @Override
-  public void commitTxn(long txnid)
-      throws NoSuchTxnException, TxnAbortedException, TException {
-    client.commit_txn(new CommitTxnRequest(txnid));
-  }
-
-  @Override
-  public GetOpenTxnsInfoResponse showTxns() throws TException {
-    return client.get_open_txns_info();
-  }
-
-  @Override
-  public void abortTxns(List<Long> txnids) throws NoSuchTxnException, TException {
-    client.abort_txns(new AbortTxnsRequest(txnids));
-  }
-
-  @Override
-  public LockResponse lock(LockRequest request)
-      throws NoSuchTxnException, TxnAbortedException, TException {
-    return client.lock(request);
-  }
-
-  @Override
-  public LockResponse checkLock(long lockid)
-      throws NoSuchTxnException, TxnAbortedException, NoSuchLockException,
-      TException {
-    return client.check_lock(new CheckLockRequest(lockid));
-  }
-
-  @Override
-  public void unlock(long lockid)
-      throws NoSuchLockException, TxnOpenException, TException {
-    client.unlock(new UnlockRequest(lockid));
-  }
-
-  @Override
-  @Deprecated
-  public ShowLocksResponse showLocks() throws TException {
-    return client.show_locks(new ShowLocksRequest());
-  }
-
-  @Override
-  public ShowLocksResponse showLocks(ShowLocksRequest request) throws TException {
-    return client.show_locks(request);
-  }
-
-  @Override
-  public void heartbeat(long txnid, long lockid)
-      throws NoSuchLockException, NoSuchTxnException, TxnAbortedException,
-      TException {
-    HeartbeatRequest hb = new HeartbeatRequest();
-    hb.setLockid(lockid);
-    hb.setTxnid(txnid);
-    client.heartbeat(hb);
-  }
-
-  @Override
-  public HeartbeatTxnRangeResponse heartbeatTxnRange(long min, long max)
-    throws NoSuchTxnException, TxnAbortedException, TException {
-    HeartbeatTxnRangeRequest rqst = new HeartbeatTxnRangeRequest(min, max);
-    return client.heartbeat_txn_range(rqst);
-  }
-
-  @Override
-  @Deprecated
-  public void compact(String dbname, String tableName, String partitionName,  CompactionType type)
-      throws TException {
-    CompactionRequest cr = new CompactionRequest();
-    if (dbname == null) cr.setDbname(DEFAULT_DATABASE_NAME);
-    else cr.setDbname(dbname);
-    cr.setTablename(tableName);
-    if (partitionName != null) cr.setPartitionname(partitionName);
-    cr.setType(type);
-    client.compact(cr);
-  }
-  @Deprecated
-  @Override
-  public void compact(String dbname, String tableName, String partitionName, CompactionType type,
-                      Map<String, String> tblproperties) throws TException {
-    compact2(dbname, tableName, partitionName, type, tblproperties);
-  }
-
-  @Override
-  public CompactionResponse compact2(String dbname, String tableName, String partitionName, CompactionType type,
-                      Map<String, String> tblproperties) throws TException {
-    CompactionRequest cr = new CompactionRequest();
-    if (dbname == null) cr.setDbname(DEFAULT_DATABASE_NAME);
-    else cr.setDbname(dbname);
-    cr.setTablename(tableName);
-    if (partitionName != null) cr.setPartitionname(partitionName);
-    cr.setType(type);
-    cr.setProperties(tblproperties);
-    return client.compact2(cr);
-  }
-  @Override
-  public ShowCompactResponse showCompactions() throws TException {
-    return client.show_compact(new ShowCompactRequest());
-  }
-
-  @Deprecated
-  @Override
-  public void addDynamicPartitions(long txnId, String dbName, String tableName,
-                                   List<String> partNames) throws TException {
-    client.add_dynamic_partitions(new AddDynamicPartitions(txnId, dbName, tableName, partNames));
-  }
-  @Override
-  public void addDynamicPartitions(long txnId, String dbName, String tableName,
-                                   List<String> partNames, DataOperationType operationType) throws TException {
-    AddDynamicPartitions adp = new AddDynamicPartitions(txnId, dbName, tableName, partNames);
-    adp.setOperationType(operationType);
-    client.add_dynamic_partitions(adp);
-  }
-
-  @Override
-  public void insertTable(Table table, boolean overwrite) throws MetaException {
-    boolean failed = true;
-    HiveMetaHook hook = getHook(table);
-    if (hook == null || !(hook instanceof DefaultHiveMetaHook)) {
-      return;
-    }
-    DefaultHiveMetaHook hiveMetaHook = (DefaultHiveMetaHook) hook;
-    try {
-      hiveMetaHook.commitInsertTable(table, overwrite);
-      failed = false;
-    }
-    finally {
-      if (failed) {
-        hiveMetaHook.rollbackInsertTable(table, overwrite);
-      }
-    }
-  }
-
-  @InterfaceAudience.LimitedPrivate({"HCatalog"})
-  @Override
-  public NotificationEventResponse getNextNotification(long lastEventId, int maxEvents,
-                             

<TRUNCATED>

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