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From zg...@apache.org
Subject hbase git commit: HBASE-18297 Provide a AsyncAdminBuilder to create new AsyncAdmin instance
Date Wed, 05 Jul 2017 02:08:46 GMT
Repository: hbase
Updated Branches:
  refs/heads/branch-2 29ec74936 -> 507f5fb84


HBASE-18297 Provide a AsyncAdminBuilder to create new AsyncAdmin instance


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/507f5fb8
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/507f5fb8
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/507f5fb8

Branch: refs/heads/branch-2
Commit: 507f5fb84414a8f1a3364926ba3559fb2845e95b
Parents: 29ec749
Author: Guanghao Zhang <zghao@apache.org>
Authored: Wed Jul 5 09:46:52 2017 +0800
Committer: Guanghao Zhang <zghao@apache.org>
Committed: Wed Jul 5 10:10:05 2017 +0800

----------------------------------------------------------------------
 .../hadoop/hbase/client/AsyncAdminBuilder.java  |  93 ++++++++
 .../hbase/client/AsyncAdminBuilderBase.java     |  77 +++++++
 .../hadoop/hbase/client/AsyncConnection.java    |  43 +++-
 .../hbase/client/AsyncConnectionImpl.java       |  19 +-
 .../hadoop/hbase/client/RawAsyncHBaseAdmin.java |  12 +-
 .../hbase/client/TestAsyncAdminBuilder.java     | 214 +++++++++++++++++++
 6 files changed, 440 insertions(+), 18 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilder.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilder.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilder.java
new file mode 100644
index 0000000..d706949
--- /dev/null
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilder.java
@@ -0,0 +1,93 @@
+/**
+ * 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.hbase.client;
+
+import static org.apache.hadoop.hbase.client.ConnectionUtils.retries2Attempts;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * For creating {@link AsyncAdmin}. The implementation should have default configurations
set before
+ * returning the builder to user. So users are free to only set the configs they care about
to
+ * create a new AsyncAdmin instance.
+ */
+@InterfaceAudience.Public
+public interface AsyncAdminBuilder<T extends AsyncAdmin> {
+
+  /**
+   * Set timeout for a whole admin operation. Operation timeout and max attempt times(or
max retry
+   * times) are both limitations for retrying, we will stop retrying when we reach any of
the
+   * limitations.
+   * @param timeout
+   * @param unit
+   * @return this for invocation chaining
+   */
+  AsyncAdminBuilder<T> setOperationTimeout(long timeout, TimeUnit unit);
+
+  /**
+   * Set timeout for each rpc request.
+   * @param timeout
+   * @param unit
+   * @return this for invocation chaining
+   */
+  AsyncAdminBuilder<T> setRpcTimeout(long timeout, TimeUnit unit);
+
+  /**
+   * Set the base pause time for retrying. We use an exponential policy to generate sleep
time when
+   * retrying.
+   * @param timeout
+   * @param unit
+   * @return this for invocation chaining
+   */
+  AsyncAdminBuilder<T> setRetryPause(long timeout, TimeUnit unit);
+
+  /**
+   * Set the max retry times for an admin operation. Usually it is the max attempt times
minus 1.
+   * Operation timeout and max attempt times(or max retry times) are both limitations for
retrying,
+   * we will stop retrying when we reach any of the limitations.
+   * @param maxRetries
+   * @return this for invocation chaining
+   */
+  default AsyncAdminBuilder<T> setMaxRetries(int maxRetries) {
+    return setMaxAttempts(retries2Attempts(maxRetries));
+  }
+
+  /**
+   * Set the max attempt times for an admin operation. Usually it is the max retry times
plus 1.
+   * Operation timeout and max attempt times(or max retry times) are both limitations for
retrying,
+   * we will stop retrying when we reach any of the limitations.
+   * @param maxAttempts
+   * @return this for invocation chaining
+   */
+  AsyncAdminBuilder<T> setMaxAttempts(int maxAttempts);
+
+  /**
+   * Set the number of retries that are allowed before we start to log.
+   * @param startLogErrorsCnt
+   * @return this for invocation chaining
+   */
+  AsyncAdminBuilder<T> setStartLogErrorsCnt(int startLogErrorsCnt);
+
+  /**
+   * Create a {@link AsyncAdmin} instance.
+   * @return a {@link AsyncAdmin} instance
+   */
+  T build();
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilderBase.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilderBase.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilderBase.java
new file mode 100644
index 0000000..013e8d7
--- /dev/null
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminBuilderBase.java
@@ -0,0 +1,77 @@
+/**
+ * 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.hbase.client;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * Base class for all asynchronous admin builders.
+ */
+@InterfaceAudience.Private
+abstract class AsyncAdminBuilderBase<T extends AsyncAdmin> implements AsyncAdminBuilder<T>
{
+
+  protected long rpcTimeoutNs;
+
+  protected long operationTimeoutNs;
+
+  protected long pauseNs;
+
+  protected int maxAttempts;
+
+  protected int startLogErrorsCnt;
+
+  AsyncAdminBuilderBase(AsyncConnectionConfiguration connConf) {
+    this.rpcTimeoutNs = connConf.getRpcTimeoutNs();
+    this.operationTimeoutNs = connConf.getOperationTimeoutNs();
+    this.pauseNs = connConf.getPauseNs();
+    this.maxAttempts = connConf.getMaxRetries();
+    this.startLogErrorsCnt = connConf.getStartLogErrorsCnt();
+  }
+
+  @Override
+  public AsyncAdminBuilder<T> setOperationTimeout(long timeout, TimeUnit unit) {
+    this.operationTimeoutNs = unit.toNanos(timeout);
+    return this;
+  }
+
+  @Override
+  public AsyncAdminBuilder<T> setRpcTimeout(long timeout, TimeUnit unit) {
+    this.rpcTimeoutNs = unit.toNanos(timeout);
+    return this;
+  }
+
+  @Override
+  public AsyncAdminBuilder<T> setRetryPause(long timeout, TimeUnit unit) {
+    this.pauseNs = unit.toNanos(timeout);
+    return this;
+  }
+
+  @Override
+  public AsyncAdminBuilder<T> setMaxAttempts(int maxAttempts) {
+    this.maxAttempts = maxAttempts;
+    return this;
+  }
+
+  @Override
+  public AsyncAdminBuilder<T> setStartLogErrorsCnt(int startLogErrorsCnt) {
+    this.startLogErrorsCnt = startLogErrorsCnt;
+    return this;
+  }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java
index 22ed064..04ef78e 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java
@@ -96,17 +96,44 @@ public interface AsyncConnection extends Closeable {
   AsyncTableBuilder<AsyncTable> getTableBuilder(TableName tableName, ExecutorService
pool);
 
   /**
-   * Retrieve an AsyncAdmin implementation to administer an HBase cluster. The returned
-   * {@code CompletableFuture} will be finished directly in the rpc framework's callback
thread, so
-   * typically you should not do any time consuming work inside these methods.
-   * @return an AsyncAdmin instance for cluster administration
+   * Retrieve an {@link AsyncAdmin} implementation to administer an HBase cluster.
+   * <p>
+   * The returned instance will use default configs. Use {@link #getAdminBuilder()} if you
want to
+   * customize some configs.
+   * <p>
+   * The admin operation's returned {@code CompletableFuture} will be finished directly in
the rpc
+   * framework's callback thread, so typically you should not do any time consuming work
inside
+   * these methods.
+   * @return an {@link AsyncAdmin} instance for cluster administration
+   */
+  default AsyncAdmin getAdmin() {
+    return getAdminBuilder().build();
+  }
+
+  /**
+   * Returns an {@link AsyncAdminBuilder} for creating {@link AsyncAdmin}.
+   * <p>
+   * The admin operation's returned {@code CompletableFuture} will be finished directly in
the rpc
+   * framework's callback thread, so typically you should not do any time consuming work
inside
+   * these methods.
    */
-  AsyncAdmin getAdmin();
+  AsyncAdminBuilder<RawAsyncHBaseAdmin> getAdminBuilder();
+
+  /**
+   * Retrieve an {@link AsyncAdmin} implementation to administer an HBase cluster.
+   * <p>
+   * The returned instance will use default configs. Use {@link #getAdminBuilder(ExecutorService)}
+   * if you want to customize some configs.
+   * @param pool the thread pool to use for executing callback
+   * @return an {@link AsyncAdmin} instance for cluster administration
+   */
+  default AsyncAdmin getAdmin(ExecutorService pool) {
+    return getAdminBuilder(pool).build();
+  }
 
   /**
-   * Retrieve an AsyncAdmin implementation to administer an HBase cluster.
+   * Returns an {@link AsyncAdminBuilder} for creating {@link AsyncAdmin}.
    * @param pool the thread pool to use for executing callback
-   * @return an AsyncAdmin instance for cluster administration
    */
-  AsyncAdmin getAdmin(ExecutorService pool);
+  AsyncAdminBuilder<AsyncHBaseAdmin> getAdminBuilder(ExecutorService pool);
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
index c170bce..5dd40cc 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java
@@ -278,12 +278,23 @@ class AsyncConnectionImpl implements AsyncConnection {
   }
 
   @Override
-  public AsyncAdmin getAdmin() {
-    return new RawAsyncHBaseAdmin(this);
+  public AsyncAdminBuilder<RawAsyncHBaseAdmin> getAdminBuilder() {
+    return new AsyncAdminBuilderBase<RawAsyncHBaseAdmin>(connConf) {
+      @Override
+      public RawAsyncHBaseAdmin build() {
+        return new RawAsyncHBaseAdmin(AsyncConnectionImpl.this, this);
+      }
+    };
   }
 
   @Override
-  public AsyncAdmin getAdmin(ExecutorService pool) {
-    return new AsyncHBaseAdmin(new RawAsyncHBaseAdmin(this), pool);
+  public AsyncAdminBuilder<AsyncHBaseAdmin> getAdminBuilder(ExecutorService pool) {
+    return new AsyncAdminBuilderBase<AsyncHBaseAdmin>(connConf) {
+      @Override
+      public AsyncHBaseAdmin build() {
+        RawAsyncHBaseAdmin rawAdmin = new RawAsyncHBaseAdmin(AsyncConnectionImpl.this, this);
+        return new AsyncHBaseAdmin(rawAdmin, pool);
+      }
+    };
   }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java
index fcfdf93..179fd7d 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java
@@ -212,14 +212,14 @@ public class RawAsyncHBaseAdmin implements AsyncAdmin {
 
   private final NonceGenerator ng;
 
-  RawAsyncHBaseAdmin(AsyncConnectionImpl connection) {
+  RawAsyncHBaseAdmin(AsyncConnectionImpl connection, AsyncAdminBuilderBase<?> builder)
{
     this.connection = connection;
     this.metaTable = connection.getRawTable(META_TABLE_NAME);
-    this.rpcTimeoutNs = connection.connConf.getRpcTimeoutNs();
-    this.operationTimeoutNs = connection.connConf.getOperationTimeoutNs();
-    this.pauseNs = connection.connConf.getPauseNs();
-    this.maxAttempts = connection.connConf.getMaxRetries();
-    this.startLogErrorsCnt = connection.connConf.getStartLogErrorsCnt();
+    this.rpcTimeoutNs = builder.rpcTimeoutNs;
+    this.operationTimeoutNs = builder.operationTimeoutNs;
+    this.pauseNs = builder.pauseNs;
+    this.maxAttempts = builder.maxAttempts;
+    this.startLogErrorsCnt = builder.startLogErrorsCnt;
     this.ng = connection.getNonceGenerator();
   }
 

http://git-wip-us.apache.org/repos/asf/hbase/blob/507f5fb8/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminBuilder.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminBuilder.java
b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminBuilder.java
new file mode 100644
index 0000000..ea25ee4
--- /dev/null
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncAdminBuilder.java
@@ -0,0 +1,214 @@
+/**
+ * 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.hbase.client;
+
+import static org.apache.hadoop.hbase.client.AsyncProcess.START_LOG_ERRORS_AFTER_COUNT_KEY;
+import static org.apache.hadoop.hbase.NamespaceDescriptor.DEFAULT_NAMESPACE_NAME_STR;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Supplier;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
+import org.apache.hadoop.hbase.coprocessor.MasterCoprocessorEnvironment;
+import org.apache.hadoop.hbase.coprocessor.MasterObserver;
+import org.apache.hadoop.hbase.coprocessor.ObserverContext;
+import org.apache.hadoop.hbase.testclassification.ClientTests;
+import org.apache.hadoop.hbase.testclassification.LargeTests;
+import org.apache.hadoop.hbase.util.Threads;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+@Category({ LargeTests.class, ClientTests.class })
+public class TestAsyncAdminBuilder {
+
+  private static final Log LOG = LogFactory.getLog(TestAsyncAdminBuilder.class);
+  private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
+  private static AsyncConnection ASYNC_CONN;
+
+  @Parameter
+  public Supplier<AsyncAdminBuilder<?>> getAdminBuilder;
+
+  private static AsyncAdminBuilder<RawAsyncHBaseAdmin> getRawAsyncAdminBuilder() {
+    return ASYNC_CONN.getAdminBuilder();
+  }
+
+  private static AsyncAdminBuilder<AsyncHBaseAdmin> getAsyncAdminBuilder() {
+    return ASYNC_CONN.getAdminBuilder(ForkJoinPool.commonPool());
+  }
+
+  @Parameters
+  public static List<Object[]> params() {
+    return Arrays.asList(new Supplier<?>[] { TestAsyncAdminBuilder::getRawAsyncAdminBuilder
},
+      new Supplier<?>[] { TestAsyncAdminBuilder::getAsyncAdminBuilder });
+  }
+
+  private static final int DEFAULT_RPC_TIMEOUT = 10000;
+  private static final int DEFAULT_OPERATION_TIMEOUT = 30000;
+  private static final int DEFAULT_RETRIES_NUMBER = 2;
+
+  @Before
+  public void setUp() throws Exception {
+    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_RPC_TIMEOUT_KEY, DEFAULT_RPC_TIMEOUT);
+    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_OPERATION_TIMEOUT,
+      DEFAULT_OPERATION_TIMEOUT);
+    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER,
+      DEFAULT_RETRIES_NUMBER);
+    TEST_UTIL.getConfiguration().setInt(START_LOG_ERRORS_AFTER_COUNT_KEY, 0);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    IOUtils.closeQuietly(ASYNC_CONN);
+    TEST_UTIL.shutdownMiniCluster();
+  }
+
+  @Test
+  public void testRpcTimeout() throws Exception {
+    TEST_UTIL.getConfiguration().set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY,
+      TestRpcTimeoutCoprocessor.class.getName());
+    TEST_UTIL.startMiniCluster(2);
+    ASYNC_CONN = ConnectionFactory.createAsyncConnection(TEST_UTIL.getConfiguration()).get();
+
+    try {
+      getAdminBuilder.get().setRpcTimeout(DEFAULT_RPC_TIMEOUT / 2, TimeUnit.MILLISECONDS).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+      fail("We expect an exception here");
+    } catch (Exception e) {
+      // expected
+    }
+
+    try {
+      getAdminBuilder.get().setRpcTimeout(DEFAULT_RPC_TIMEOUT * 2, TimeUnit.MILLISECONDS).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+    } catch (Exception e) {
+      fail("The Operation should succeed, unexpected exception: " + e.getMessage());
+    }
+  }
+
+  @Test
+  public void testOperationTimeout() throws Exception {
+    // set retry number to 100 to make sure that this test only be affected by operation
timeout
+    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 100);
+    TEST_UTIL.getConfiguration().set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY,
+      TestOperationTimeoutCoprocessor.class.getName());
+    TEST_UTIL.startMiniCluster(2);
+    ASYNC_CONN = ConnectionFactory.createAsyncConnection(TEST_UTIL.getConfiguration()).get();
+
+    try {
+      getAdminBuilder.get()
+          .setOperationTimeout(DEFAULT_OPERATION_TIMEOUT / 2, TimeUnit.MILLISECONDS).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+      fail("We expect an exception here");
+    } catch (Exception e) {
+      // expected
+    }
+
+    try {
+      getAdminBuilder.get()
+          .setOperationTimeout(DEFAULT_OPERATION_TIMEOUT * 2, TimeUnit.MILLISECONDS).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+    } catch (Exception e) {
+      fail("The Operation should succeed, unexpected exception: " + e.getMessage());
+    }
+  }
+
+  @Test
+  public void testMaxRetries() throws Exception {
+    // set operation timeout to 300s to make sure that this test only be affected by retry
number
+    TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_OPERATION_TIMEOUT, 300000);
+    TEST_UTIL.getConfiguration().set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY,
+      TestMaxRetriesCoprocessor.class.getName());
+    TEST_UTIL.startMiniCluster(2);
+    ASYNC_CONN = ConnectionFactory.createAsyncConnection(TEST_UTIL.getConfiguration()).get();
+
+    try {
+      getAdminBuilder.get().setMaxRetries(DEFAULT_RETRIES_NUMBER / 2).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+      fail("We expect an exception here");
+    } catch (Exception e) {
+      // expected
+    }
+
+    try {
+      getAdminBuilder.get().setMaxRetries(DEFAULT_RETRIES_NUMBER * 2).build()
+          .getNamespaceDescriptor(DEFAULT_NAMESPACE_NAME_STR).get();
+    } catch (Exception e) {
+      fail("The Operation should succeed, unexpected exception: " + e.getMessage());
+    }
+  }
+
+  public static class TestRpcTimeoutCoprocessor implements MasterObserver {
+    public TestRpcTimeoutCoprocessor() {
+    }
+
+    @Override
+    public void preGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment>
ctx,
+        String namespace) throws IOException {
+      Threads.sleep(DEFAULT_RPC_TIMEOUT);
+    }
+  }
+
+  public static class TestOperationTimeoutCoprocessor implements MasterObserver {
+    AtomicLong sleepTime = new AtomicLong(0);
+
+    public TestOperationTimeoutCoprocessor() {
+    }
+
+    @Override
+    public void preGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment>
ctx,
+        String namespace) throws IOException {
+      Threads.sleep(DEFAULT_RPC_TIMEOUT / 2);
+      if (sleepTime.addAndGet(DEFAULT_RPC_TIMEOUT / 2) < DEFAULT_OPERATION_TIMEOUT) {
+        throw new IOException("call fail");
+      }
+    }
+  }
+
+  public static class TestMaxRetriesCoprocessor implements MasterObserver {
+    AtomicLong retryNum = new AtomicLong(0);
+
+    public TestMaxRetriesCoprocessor() {
+    }
+
+    @Override
+    public void preGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment>
ctx,
+        String namespace) throws IOException {
+      if (retryNum.getAndIncrement() < DEFAULT_RETRIES_NUMBER) {
+        throw new IOException("call fail");
+      }
+    }
+  }
+}
\ No newline at end of file


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