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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #574: DRILL-4726: Dynamic UDFs support
Date Wed, 07 Sep 2016 20:59:27 GMT
Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/574#discussion_r77902655
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/CreateFunctionHandler.java
---
    @@ -0,0 +1,195 @@
    +/**
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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.drill.exec.planner.sql.handlers;
    +
    +import com.google.common.collect.Lists;
    +import com.google.common.io.Files;
    +import org.apache.calcite.sql.SqlCharStringLiteral;
    +import org.apache.calcite.sql.SqlNode;
    +import org.apache.commons.io.FileUtils;
    +import org.apache.drill.common.exceptions.DrillRuntimeException;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.exec.ExecConstants;
    +import org.apache.drill.exec.exception.FunctionValidationException;
    +import org.apache.drill.exec.exception.VersionMismatchException;
    +import org.apache.drill.exec.expr.fn.RemoteFunctionRegistry;
    +import org.apache.drill.exec.physical.PhysicalPlan;
    +import org.apache.drill.exec.planner.sql.DirectPlan;
    +import org.apache.drill.exec.planner.sql.parser.SqlCreateFunction;
    +import org.apache.drill.exec.proto.UserBitShared.Func;
    +import org.apache.drill.exec.proto.UserBitShared.Jar;
    +import org.apache.drill.exec.proto.UserBitShared.Registry;
    +import org.apache.drill.exec.store.sys.store.DataChangeVersion;
    +import org.apache.drill.exec.util.JarUtil;
    +import org.apache.drill.exec.work.foreman.ForemanSetupException;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.FileUtil;
    +import org.apache.hadoop.fs.Path;
    +
    +import java.io.File;
    +import java.io.IOException;
    +import java.util.List;
    +import java.util.UUID;
    +
    +public class CreateFunctionHandler extends DefaultSqlHandler {
    +
    +  private static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CreateFunctionHandler.class);
    +
    +  public CreateFunctionHandler(SqlHandlerConfig config) {
    +    super(config);
    +  }
    +
    +  /**
    +   * Creates UDFs dynamically.
    +   *
    +   * @return - Single row indicating list of registered UDFs, raise exception otherwise
    +   */
    +  @Override
    +  public PhysicalPlan getPlan(SqlNode sqlNode) throws ForemanSetupException, IOException
{
    +    if (context.getOption(ExecConstants.DYNAMIC_UDF_SUPPORT_ENABLED).bool_val) {
    +      SqlCreateFunction node = unwrap(sqlNode, SqlCreateFunction.class);
    +      String jarName = ((SqlCharStringLiteral) node.getJar()).toValue();
    +      String sourceName = JarUtil.getSourceName(jarName);
    +
    +      RemoteFunctionRegistry remoteRegistry = context.getRemoteFunctionRegistry();
    +      FileSystem fs = remoteRegistry.getFs();
    +      Path tmpDir = new Path(remoteRegistry.getTmpArea(), UUID.randomUUID().toString());
    +      File localTmpDir = Files.createTempDir();
    +
    +      boolean inProgress = false;
    +      try {
    +        final String action = remoteRegistry.addToJars(jarName, RemoteFunctionRegistry.Action.REGISTRATION);
    +        if (!(inProgress = action == null)) {
    +          return DirectPlan.createDirectPlan(context, false,
    +              String.format("Jar with %s name is used. Action: %s", jarName, action));
    +        }
    +
    +        // verify that binary and source exist
    +        Path remoteBinary = new Path(remoteRegistry.getStagingArea(), jarName);
    +        Path remoteSource = new Path(remoteRegistry.getStagingArea(), sourceName);
    +        if (!fs.exists(remoteBinary) || !fs.exists(remoteSource)) {
    +          return DirectPlan.createDirectPlan(context, false,
    +              String.format("Binary [%s] or source [%s] is absent in udf staging area
[%s].", jarName, sourceName, remoteRegistry.getStagingArea().toUri().getPath()));
    +        }
    +
    +        // backup binary & source (copy to udf tmp directory)
    +        fs.mkdirs(tmpDir);
    +        Path tmpBinary = new Path(tmpDir, jarName);
    +        Path tmpSource = new Path(tmpDir, sourceName);
    +
    +        FileUtil.copy(fs, remoteBinary, fs, tmpBinary, false, fs.getConf());
    +        FileUtil.copy(fs, remoteSource, fs, tmpSource, false, fs.getConf());
    +
    +        // copy binary to local fs, we don't need source for validation
    +        Path localBinary = new Path(new Path(localTmpDir.toURI()), jarName);
    +        fs.copyToLocalFile(tmpBinary, localBinary);
    +
    +        // validate functions locally
    +        List<Func> functions;
    +        try {
    +          functions = context.getFunctionRegistry().validate(localBinary);
    +        } catch (FunctionValidationException ex) {
    +          return DirectPlan.createDirectPlan(context, false, ex.getMessage());
    +        }
    +
    +        if (functions.size() == 0) {
    +          return DirectPlan.createDirectPlan(context, false,
    +              String.format("Jar %s does not contain functions", jarName));
    +        }
    +
    +        // validate and register remotely
    +        Jar jar = Jar.newBuilder().setName(jarName).addAllFunction(functions).build();
    +        String error = register(remoteRegistry, jar, tmpBinary, tmpSource, remoteRegistry.getRetryTimes());
    +
    +        if (error != null) {
    +          return DirectPlan.createDirectPlan(context, false, error);
    +        }
    +
    +        // remove jars from staging area
    +        try {
    +          fs.delete(remoteBinary, false);
    --- End diff --
    
    Really a comment for another file, but I thought of it here...
    
    When we register a function, how do we handle race conditions:
    
    If we do ZK first, then the fn may not yet exist in DFS for a client that reads ZK before
the move is made.
    
    If we move the jar first, then crash, how do we clean up the "orphan" jar file?
    
    We could use a retry to handle the first case (ZK first, then move file.)
    
    What does this implementation use?


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