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From t...@apache.org
Subject svn commit: r1308637 - in /hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs: ./ dev-support/ src/main/bin/ src/main/java/org/apache/hadoop/hdfs/tools/ src/main/proto/ src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/
Date Tue, 03 Apr 2012 00:59:03 GMT
Author: todd
Date: Tue Apr  3 00:59:02 2012
New Revision: 1308637

URL: http://svn.apache.org/viewvc?rev=1308637&view=rev
Log:
HDFS-2185. HDFS portion of ZK-based FailoverController. Contributed by Todd Lipcon.

Added:
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java
Modified:
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs
    hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java

Added: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt?rev=1308637&view=auto
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt
(added)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt
Tue Apr  3 00:59:02 2012
@@ -0,0 +1,7 @@
+Changes for HDFS-3042 branch.
+
+This change list will be merged into the trunk CHANGES.txt when the HDFS-3042
+branch is merged.
+------------------------------
+
+HDFS-2185. HDFS portion of ZK-based FailoverController (todd)

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml?rev=1308637&r1=1308636&r2=1308637&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
(original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
Tue Apr  3 00:59:02 2012
@@ -6,6 +6,9 @@
        <Package name="org.apache.hadoop.hdfs.protocol.proto" />
      </Match>
      <Match>
+       <Package name="org.apache.hadoop.hdfs.server.namenode.ha.proto" />
+     </Match>
+     <Match>
        <Bug pattern="EI_EXPOSE_REP" />
      </Match>
      <Match>

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml?rev=1308637&r1=1308636&r2=1308637&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/pom.xml Tue Apr  3 00:59:02
2012
@@ -110,6 +110,33 @@
       <artifactId>ant</artifactId>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.zookeeper</groupId>
+      <artifactId>zookeeper</artifactId>
+      <version>3.4.2</version>
+      <exclusions>
+        <exclusion>
+          <!-- otherwise seems to drag in junit 3.8.1 via jline -->
+          <groupId>junit</groupId>
+          <artifactId>junit</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.sun.jdmk</groupId>
+          <artifactId>jmxtools</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.sun.jmx</groupId>
+          <artifactId>jmxri</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.zookeeper</groupId>
+      <artifactId>zookeeper</artifactId>
+      <version>3.4.2</version>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs?rev=1308637&r1=1308636&r2=1308637&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs (original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/bin/hdfs Tue
Apr  3 00:59:02 2012
@@ -30,6 +30,7 @@ function print_usage(){
   echo "  namenode -format     format the DFS filesystem"
   echo "  secondarynamenode    run the DFS secondary namenode"
   echo "  namenode             run the DFS namenode"
+  echo "  zkfc                 run the ZK Failover Controller daemon"
   echo "  datanode             run a DFS datanode"
   echo "  dfsadmin             run a DFS admin client"
   echo "  haadmin              run a DFS HA admin client"
@@ -71,6 +72,9 @@ fi
 if [ "$COMMAND" = "namenode" ] ; then
   CLASS='org.apache.hadoop.hdfs.server.namenode.NameNode'
   HADOOP_OPTS="$HADOOP_OPTS $HADOOP_NAMENODE_OPTS"
+elif [ "$COMMAND" = "zkfc" ] ; then
+  CLASS='org.apache.hadoop.hdfs.tools.DFSZKFailoverController'
+  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_ZKFC_OPTS"
 elif [ "$COMMAND" = "secondarynamenode" ] ; then
   CLASS='org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode'
   HADOOP_OPTS="$HADOOP_OPTS $HADOOP_SECONDARYNAMENODE_OPTS"

Added: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java?rev=1308637&view=auto
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java
(added)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java
Tue Apr  3 00:59:02 2012
@@ -0,0 +1,115 @@
+/**
+ * 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.hdfs.tools;
+
+import java.net.InetSocketAddress;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ha.HAServiceTarget;
+import org.apache.hadoop.ha.ZKFailoverController;
+import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.HAUtil;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+import org.apache.hadoop.hdfs.server.namenode.ha.proto.HAZKInfoProtos.ActiveNodeInfo;
+import org.apache.hadoop.util.StringUtils;
+import org.apache.hadoop.util.ToolRunner;
+
+import com.google.common.base.Preconditions;
+import com.google.protobuf.InvalidProtocolBufferException;
+
+@InterfaceAudience.Private
+public class DFSZKFailoverController extends ZKFailoverController {
+
+  private static final Log LOG =
+    LogFactory.getLog(DFSZKFailoverController.class);
+  private NNHAServiceTarget localTarget;
+  private Configuration localNNConf;
+
+  @Override
+  protected HAServiceTarget dataToTarget(byte[] data) {
+    ActiveNodeInfo proto;
+    try {
+      proto = ActiveNodeInfo.parseFrom(data);
+    } catch (InvalidProtocolBufferException e) {
+      throw new RuntimeException("Invalid data in ZK: " +
+          StringUtils.byteToHexString(data));
+    }
+    NNHAServiceTarget ret = new NNHAServiceTarget(
+        getConf(), proto.getNameserviceId(), proto.getNamenodeId());
+    InetSocketAddress addressFromProtobuf = new InetSocketAddress(
+        proto.getHostname(), proto.getPort());
+    
+    if (!addressFromProtobuf.equals(ret.getAddress())) {
+      throw new RuntimeException("Mismatched address stored in ZK for " +
+          ret + ": Stored protobuf was " + proto + ", address from our own " +
+          "configuration for this NameNode was " + ret.getAddress());
+    }
+    return ret;
+  }
+
+  @Override
+  protected byte[] targetToData(HAServiceTarget target) {
+    InetSocketAddress addr = target.getAddress();
+    return ActiveNodeInfo.newBuilder()
+      .setHostname(addr.getHostName())
+      .setPort(addr.getPort())
+      .setNameserviceId(localTarget.getNameServiceId())
+      .setNamenodeId(localTarget.getNameNodeId())
+      .build()
+      .toByteArray();
+  }
+  
+  @Override
+  public void setConf(Configuration conf) {
+    // Use HdfsConfiguration here to force hdfs-site.xml to load
+    localNNConf = new HdfsConfiguration(conf);
+    
+    String nsId = DFSUtil.getNamenodeNameServiceId(conf);
+
+    if (!HAUtil.isHAEnabled(localNNConf, nsId)) {
+      throw new HadoopIllegalArgumentException(
+          "HA is not enabled for this namenode.");
+    }
+    String nnId = HAUtil.getNameNodeId(localNNConf, nsId);
+    NameNode.initializeGenericKeys(localNNConf, nsId, nnId);
+    
+    localTarget = new NNHAServiceTarget(localNNConf, nsId, nnId);
+    
+    super.setConf(localNNConf);
+    LOG.info("Failover controller configured for NameNode " +
+        nsId + "." + nnId);
+  }
+
+  @Override
+  public HAServiceTarget getLocalTarget() {
+    Preconditions.checkState(localTarget != null,
+        "setConf() should have already been called");
+    return localTarget;
+  }
+  
+  public static void main(String args[])
+      throws Exception {
+    System.exit(ToolRunner.run(
+        new DFSZKFailoverController(), args));
+  }
+}

Modified: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java?rev=1308637&r1=1308636&r2=1308637&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java
(original)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/NNHAServiceTarget.java
Tue Apr  3 00:59:02 2012
@@ -20,11 +20,11 @@ package org.apache.hadoop.hdfs.tools;
 import java.net.InetSocketAddress;
 
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ha.BadFencingConfigurationException;
 import org.apache.hadoop.ha.HAServiceTarget;
 import org.apache.hadoop.ha.NodeFencer;
 import org.apache.hadoop.hdfs.DFSUtil;
-import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.net.NetUtils;
 
@@ -38,11 +38,13 @@ public class NNHAServiceTarget extends H
   private final InetSocketAddress addr;
   private NodeFencer fencer;
   private BadFencingConfigurationException fenceConfigError;
+  private final String nnId;
+  private final String nsId;
 
-  public NNHAServiceTarget(HdfsConfiguration conf,
+  public NNHAServiceTarget(Configuration localNNConf,
       String nsId, String nnId) {
     String serviceAddr = 
-      DFSUtil.getNamenodeServiceAddr(conf, nsId, nnId);
+      DFSUtil.getNamenodeServiceAddr(localNNConf, nsId, nnId);
     if (serviceAddr == null) {
       throw new IllegalArgumentException(
           "Unable to determine service address for namenode '" + nnId + "'");
@@ -50,10 +52,12 @@ public class NNHAServiceTarget extends H
     this.addr = NetUtils.createSocketAddr(serviceAddr,
         NameNode.DEFAULT_PORT);
     try {
-      this.fencer = NodeFencer.create(conf);
+      this.fencer = NodeFencer.create(localNNConf);
     } catch (BadFencingConfigurationException e) {
       this.fenceConfigError = e;
     }
+    this.nnId = nnId;
+    this.nsId = nsId;
   }
 
   /**
@@ -69,6 +73,10 @@ public class NNHAServiceTarget extends H
     if (fenceConfigError != null) {
       throw fenceConfigError;
     }
+    if (fencer == null) {
+      throw new BadFencingConfigurationException(
+          "No fencer configured for " + this);
+    }
   }
   
   @Override
@@ -81,4 +89,11 @@ public class NNHAServiceTarget extends H
     return "NameNode at " + addr;
   }
 
+  public String getNameServiceId() {
+    return this.nsId;
+  }
+  
+  public String getNameNodeId() {
+    return this.nnId;
+  }
 }

Added: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto?rev=1308637&view=auto
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto
(added)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/HAZKInfo.proto
Tue Apr  3 00:59:02 2012
@@ -0,0 +1,27 @@
+/**
+ * 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.
+ */
+option java_package = "org.apache.hadoop.hdfs.server.namenode.ha.proto";
+option java_outer_classname = "HAZKInfoProtos";
+
+message ActiveNodeInfo {
+  required string nameserviceId = 1;
+  required string namenodeId = 2;
+
+  required string hostname = 3;
+  required int32 port = 4;
+}

Added: hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java?rev=1308637&view=auto
==============================================================================
--- hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java
(added)
+++ hadoop/common/branches/HDFS-3042/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java
Tue Apr  3 00:59:02 2012
@@ -0,0 +1,181 @@
+/**
+ * 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.hdfs.server.namenode.ha;
+
+import static org.junit.Assert.*;
+
+import java.io.File;
+import java.util.concurrent.TimeoutException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.ha.NodeFencer;
+import org.apache.hadoop.ha.ZKFailoverController;
+import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
+import org.apache.hadoop.ha.TestNodeFencer.AlwaysSucceedFencer;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.MiniDFSNNTopology;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+import org.apache.hadoop.hdfs.tools.DFSZKFailoverController;
+import org.apache.hadoop.test.GenericTestUtils;
+import org.apache.hadoop.test.MultithreadedTestUtil.TestContext;
+import org.apache.hadoop.test.MultithreadedTestUtil.TestingThread;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+
+import com.google.common.base.Supplier;
+
+public class TestDFSZKFailoverController extends ClientBase {
+  private Configuration conf;
+  private MiniDFSCluster cluster;
+  private TestContext ctx;
+  private ZKFCThread thr1, thr2;
+  private FileSystem fs;
+  
+  @Override
+  public void setUp() throws Exception {
+    // build.test.dir is used by zookeeper
+    new File(System.getProperty("build.test.dir", "build")).mkdirs();
+    super.setUp();
+  }
+
+  @Before
+  public void setup() throws Exception {
+    conf = new Configuration();
+    conf.set(ZKFailoverController.ZK_QUORUM_KEY, hostPort);
+    conf.set(NodeFencer.CONF_METHODS_KEY,
+        AlwaysSucceedFencer.class.getName());
+
+    MiniDFSNNTopology topology = new MiniDFSNNTopology()
+    .addNameservice(new MiniDFSNNTopology.NSConf("ns1")
+        .addNN(new MiniDFSNNTopology.NNConf("nn1").setIpcPort(10001))
+        .addNN(new MiniDFSNNTopology.NNConf("nn2").setIpcPort(10002)));
+    cluster = new MiniDFSCluster.Builder(conf)
+        .nnTopology(topology)
+        .numDataNodes(0)
+        .build();
+    cluster.waitActive();
+
+    ctx = new TestContext();
+    ctx.addThread(thr1 = new ZKFCThread(ctx, 0));
+    assertEquals(0, thr1.zkfc.run(new String[]{"-formatZK"}));
+
+    thr1.start();
+    waitForHAState(0, HAServiceState.ACTIVE);
+    
+    ctx.addThread(thr2 = new ZKFCThread(ctx, 1));
+    thr2.start();
+    
+    fs = HATestUtil.configureFailoverFs(cluster, conf);
+  }
+  
+  @After
+  public void shutdown() throws Exception {
+    cluster.shutdown();
+    
+    if (thr1 != null) {
+      thr1.interrupt();
+    }
+    if (thr2 != null) {
+      thr2.interrupt();
+    }
+    if (ctx != null) {
+      ctx.stop();
+    }
+  }
+  
+  /**
+   * Test that automatic failover is triggered by shutting the
+   * active NN down.
+   */
+  @Test(timeout=30000)
+  public void testFailoverAndBackOnNNShutdown() throws Exception {
+    Path p1 = new Path("/dir1");
+    Path p2 = new Path("/dir2");
+    
+    // Write some data on the first NN
+    fs.mkdirs(p1);
+    // Shut it down, causing automatic failover
+    cluster.shutdownNameNode(0);
+    // Data should still exist. Write some on the new NN
+    assertTrue(fs.exists(p1));
+    fs.mkdirs(p2);
+    assertEquals(AlwaysSucceedFencer.getLastFencedService().getAddress(),
+        thr1.zkfc.getLocalTarget().getAddress());
+    
+    // Start the first node back up
+    cluster.restartNameNode(0);
+    // This should have no effect -- the new node should be STANDBY.
+    waitForHAState(0, HAServiceState.STANDBY);
+    assertTrue(fs.exists(p1));
+    assertTrue(fs.exists(p2));
+    // Shut down the second node, which should failback to the first
+    cluster.shutdownNameNode(1);
+    waitForHAState(0, HAServiceState.ACTIVE);
+
+    // First node should see what was written on the second node while it was down.
+    assertTrue(fs.exists(p1));
+    assertTrue(fs.exists(p2));
+    assertEquals(AlwaysSucceedFencer.getLastFencedService().getAddress(),
+        thr2.zkfc.getLocalTarget().getAddress());
+  }
+  
+  private void waitForHAState(int nnidx, final HAServiceState state)
+      throws TimeoutException, InterruptedException {
+    final NameNode nn = cluster.getNameNode(nnidx);
+    GenericTestUtils.waitFor(new Supplier<Boolean>() {
+      @Override
+      public Boolean get() {
+        try {
+          return nn.getRpcServer().getServiceStatus().getState() == state;
+        } catch (Exception e) {
+          e.printStackTrace();
+          return false;
+        }
+      }
+    }, 50, 5000);
+  }
+
+  /**
+   * Test-thread which runs a ZK Failover Controller corresponding
+   * to a given NameNode in the minicluster.
+   */
+  private class ZKFCThread extends TestingThread {
+    private final DFSZKFailoverController zkfc;
+
+    public ZKFCThread(TestContext ctx, int idx) {
+      super(ctx);
+      this.zkfc = new DFSZKFailoverController();
+      zkfc.setConf(cluster.getConfiguration(idx));
+    }
+
+    @Override
+    public void doWork() throws Exception {
+      try {
+        assertEquals(0, zkfc.run(new String[0]));
+      } catch (InterruptedException ie) {
+        // Interrupted by main thread, that's OK.
+      }
+    }
+  }
+
+}



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