HDFS-3412. Fix findbugs warnings in auto-HA branch. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-3042@1338817 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml

@@ -290,5 +290,9 @@
       <!-- protobuf generated code -->
       <Class name="~org\.apache\.hadoop\.ha\.proto\.HAServiceProtocolProtos.*"/>
     </Match>
+    <Match>
+      <!-- protobuf generated code -->
+      <Class name="~org\.apache\.hadoop\.ha\.proto\.ZKFCProtocolProtos.*"/>
+    </Match>
 
  </FindBugsFilter>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ZKFailoverController.java

@@ -44,7 +44,6 @@
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.PolicyProvider;
 import org.apache.hadoop.util.StringUtils;
-import org.apache.hadoop.util.Tool;
 import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.ZooDefs.Ids;
 import org.apache.hadoop.util.ToolRunner;
@@ -56,7 +55,7 @@
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 @InterfaceAudience.LimitedPrivate("HDFS")
-public abstract class ZKFailoverController implements Tool {
+public abstract class ZKFailoverController {
 
   static final Log LOG = LogFactory.getLog(ZKFailoverController.class);
   
@@ -93,15 +92,14 @@ public abstract class ZKFailoverController implements Tool {
   /** Cannot connect to ZooKeeper */
   static final int ERR_CODE_NO_ZK = 6;
   
-  private Configuration conf;
+  protected Configuration conf;
   private String zkQuorum;
+  protected final HAServiceTarget localTarget;
 
   private HealthMonitor healthMonitor;
   private ActiveStandbyElector elector;
   protected ZKFCRpcServer rpcServer;
 
-  private HAServiceTarget localTarget;
-
   private State lastHealthState = State.INITIALIZING;
 
   /** Set if a fatal error occurs */
@@ -123,15 +121,13 @@ public abstract class ZKFailoverController implements Tool {
   private ActiveAttemptRecord lastActiveAttemptRecord;
   private Object activeAttemptRecordLock = new Object();
 
-  @Override
-  public void setConf(Configuration conf) {
+  protected ZKFailoverController(Configuration conf, HAServiceTarget localTarget) {
+    this.localTarget = localTarget;
     this.conf = conf;
-    localTarget = getLocalTarget();
   }
   
 
   protected abstract byte[] targetToData(HAServiceTarget target);
-  protected abstract HAServiceTarget getLocalTarget();
   protected abstract HAServiceTarget dataToTarget(byte[] data);
   protected abstract void loginAsFCUser() throws IOException;
   protected abstract void checkRpcAdminAccess()
@@ -147,12 +143,10 @@ protected abstract void checkRpcAdminAccess()
    */
   protected abstract String getScopeInsideParentNode();
 
-  @Override
-  public Configuration getConf() {
-    return conf;
+  public HAServiceTarget getLocalTarget() {
+    return localTarget;
   }
   
-  @Override
   public int run(final String[] args) throws Exception {
     if (!localTarget.isAutoFailoverEnabled()) {
       LOG.fatal("Automatic failover is not enabled for " + localTarget + "." +
@@ -792,10 +786,16 @@ public void run() {
    * by the HealthMonitor.
    */
   @VisibleForTesting
-  State getLastHealthState() {
+  synchronized State getLastHealthState() {
     return lastHealthState;
   }
 
+  private synchronized void setLastHealthState(HealthMonitor.State newState) {
+    LOG.info("Local service " + localTarget +
+        " entered state: " + newState);
+    lastHealthState = newState;
+  }
+  
   @VisibleForTesting
   ActiveStandbyElector getElectorForTests() {
     return elector;
@@ -836,9 +836,11 @@ public void fenceOldActive(byte[] data) {
     
     @Override
     public String toString() {
+      synchronized (ZKFailoverController.this) {
         return "Elector callbacks for " + localTarget;
       }
     }
+  }
   
   /**
    * Callbacks from HealthMonitor
@@ -846,9 +848,7 @@ public String toString() {
   class HealthCallbacks implements HealthMonitor.Callback {
     @Override
     public void enteredState(HealthMonitor.State newState) {
-      LOG.info("Local service " + localTarget +
-          " entered state: " + newState);
-      lastHealthState = newState;
+      setLastHealthState(newState);
       recheckElectability();
     }
   }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/MiniZKFCCluster.java

@@ -253,8 +253,7 @@ private class DummyZKFCThread extends TestingThread {
 
     public DummyZKFCThread(TestContext ctx, DummyHAService svc) {
       super(ctx);
-      this.zkfc = new DummyZKFC(svc);
-      zkfc.setConf(conf);
+      this.zkfc = new DummyZKFC(conf, svc);
     }
 
     @Override
@@ -276,7 +275,8 @@ static class DummyZKFC extends ZKFailoverController {
       SCOPED_PARENT_ZNODE + "/" + ActiveStandbyElector.LOCK_FILENAME;
     private final DummyHAService localTarget;
     
-    public DummyZKFC(DummyHAService localTarget) {
+    public DummyZKFC(Configuration conf, DummyHAService localTarget) {
+      super(conf, localTarget);
       this.localTarget = localTarget;
     }
 
@@ -291,11 +291,6 @@ protected HAServiceTarget dataToTarget(byte[] data) {
       return DummyHAService.getInstance(index);
     }
 
-    @Override
-    protected HAServiceTarget getLocalTarget() {
-      return localTarget;
-    }
-
     @Override
     protected void loginAsFCUser() throws IOException {
     }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestZKFailoverController.java

@@ -112,13 +112,12 @@ public void testNoZK() throws Exception {
   public void testFormatOneClusterLeavesOtherClustersAlone() throws Exception {
     DummyHAService svc = cluster.getService(1);
 
-    DummyZKFC zkfcInOtherCluster = new DummyZKFC(cluster.getService(1)) {
+    DummyZKFC zkfcInOtherCluster = new DummyZKFC(conf, cluster.getService(1)) {
       @Override
       protected String getScopeInsideParentNode() {
         return "other-scope";
       }
     };
-    zkfcInOtherCluster.setConf(conf);
     
     // Run without formatting the base dir,
     // should barf
@@ -580,8 +579,7 @@ public void testOneOfEverything() throws Exception {
   }
 
   private int runFC(DummyHAService target, String ... args) throws Exception {
-    DummyZKFC zkfc = new DummyZKFC(target);
-    zkfc.setConf(conf);
+    DummyZKFC zkfc = new DummyZKFC(conf, target);
     return zkfc.run(args);
   }
 

hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-3042.txt

@@ -13,3 +13,5 @@ HDFS-3223. add zkfc to hadoop-daemon.sh script (todd)
 HDFS-3261. TestHASafeMode fails on HDFS-3042 branch (todd)
 
 HDFS-3159. Document NN auto-failover setup and configuration (todd)
+
+HDFS-3412. Fix findbugs warnings in auto-HA branch (todd)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java

@@ -34,6 +34,7 @@
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.HAUtil;
 import org.apache.hadoop.hdfs.HDFSPolicyProvider;
+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.ipc.Server;
@@ -42,10 +43,9 @@
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.AccessControlList;
 import org.apache.hadoop.security.authorize.PolicyProvider;
+import org.apache.hadoop.util.GenericOptionsParser;
 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
@@ -53,9 +53,9 @@ public class DFSZKFailoverController extends ZKFailoverController {
 
   private static final Log LOG =
     LogFactory.getLog(DFSZKFailoverController.class);
-  private NNHAServiceTarget localTarget;
-  private Configuration localNNConf;
   private AccessControlList adminAcl;
+  /* the same as superclass's localTarget, but with the more specfic NN type */
+  private final NNHAServiceTarget localNNTarget;
 
   @Override
   protected HAServiceTarget dataToTarget(byte[] data) {
@@ -67,7 +67,7 @@ protected HAServiceTarget dataToTarget(byte[] data) {
           StringUtils.byteToHexString(data));
     }
     NNHAServiceTarget ret = new NNHAServiceTarget(
-        getConf(), proto.getNameserviceId(), proto.getNamenodeId());
+        conf, proto.getNameserviceId(), proto.getNamenodeId());
     InetSocketAddress addressFromProtobuf = new InetSocketAddress(
         proto.getHostname(), proto.getPort());
     
@@ -89,15 +89,15 @@ protected byte[] targetToData(HAServiceTarget target) {
       .setHostname(addr.getHostName())
       .setPort(addr.getPort())
       .setZkfcPort(target.getZKFCAddress().getPort())
-      .setNameserviceId(localTarget.getNameServiceId())
-      .setNamenodeId(localTarget.getNameNodeId())
+      .setNameserviceId(localNNTarget.getNameServiceId())
+      .setNamenodeId(localNNTarget.getNameNodeId())
       .build()
       .toByteArray();
   }
   
   @Override
   protected InetSocketAddress getRpcAddressToBindTo() {
-    int zkfcPort = getZkfcPort(localNNConf);
+    int zkfcPort = getZkfcPort(conf);
     return new InetSocketAddress(localTarget.getAddress().getAddress(),
           zkfcPort);
   }
@@ -113,9 +113,8 @@ static int getZkfcPort(Configuration conf) {
         DFSConfigKeys.DFS_HA_ZKFC_PORT_DEFAULT);
   }
   
-  @Override
-  public void setConf(Configuration conf) {
-    localNNConf = DFSHAAdmin.addSecurityConfiguration(conf);
+  public static DFSZKFailoverController create(Configuration conf) {
+    Configuration localNNConf = DFSHAAdmin.addSecurityConfiguration(conf);
     String nsId = DFSUtil.getNamenodeNameServiceId(conf);
 
     if (!HAUtil.isHAEnabled(localNNConf, nsId)) {
@@ -126,47 +125,50 @@ public void setConf(Configuration conf) {
     NameNode.initializeGenericKeys(localNNConf, nsId, nnId);
     DFSUtil.setGenericConf(localNNConf, nsId, nnId, ZKFC_CONF_KEYS);
     
-    localTarget = new NNHAServiceTarget(localNNConf, nsId, nnId);
+    NNHAServiceTarget localTarget = new NNHAServiceTarget(
+        localNNConf, nsId, nnId);
+    return new DFSZKFailoverController(localNNConf, localTarget);
+  }
 
+  private DFSZKFailoverController(Configuration conf,
+      NNHAServiceTarget localTarget) {
+    super(conf, localTarget);
+    this.localNNTarget = localTarget;
     // Setup ACLs
     adminAcl = new AccessControlList(
         conf.get(DFSConfigKeys.DFS_ADMIN, " "));
-    
-    super.setConf(localNNConf);
     LOG.info("Failover controller configured for NameNode " +
-        nsId + "." + nnId);
-  }
+        localTarget);
+}
   
   
   @Override
   protected void initRPC() throws IOException {
     super.initRPC();
-    localTarget.setZkfcPort(rpcServer.getAddress().getPort());
-  }
-
-  @Override
-  public HAServiceTarget getLocalTarget() {
-    Preconditions.checkState(localTarget != null,
-        "setConf() should have already been called");
-    return localTarget;
+    localNNTarget.setZkfcPort(rpcServer.getAddress().getPort());
   }
 
   @Override
   public void loginAsFCUser() throws IOException {
-    InetSocketAddress socAddr = NameNode.getAddress(localNNConf);
-    SecurityUtil.login(getConf(), DFS_NAMENODE_KEYTAB_FILE_KEY,
+    InetSocketAddress socAddr = NameNode.getAddress(conf);
+    SecurityUtil.login(conf, DFS_NAMENODE_KEYTAB_FILE_KEY,
         DFS_NAMENODE_USER_NAME_KEY, socAddr.getHostName());
   }
   
   @Override
   protected String getScopeInsideParentNode() {
-    return localTarget.getNameServiceId();
+    return localNNTarget.getNameServiceId();
   }
 
   public static void main(String args[])
       throws Exception {
-    System.exit(ToolRunner.run(
-        new DFSZKFailoverController(), args));
+    
+    GenericOptionsParser parser = new GenericOptionsParser(
+        new HdfsConfiguration(), args);
+    DFSZKFailoverController zkfc = DFSZKFailoverController.create(
+        parser.getConfiguration());
+    
+    System.exit(zkfc.run(parser.getRemainingArgs()));
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDFSZKFailoverController.java

@@ -193,8 +193,8 @@ private class ZKFCThread extends TestingThread {
 
     public ZKFCThread(TestContext ctx, int idx) {
       super(ctx);
-      this.zkfc = new DFSZKFailoverController();
-      zkfc.setConf(cluster.getConfiguration(idx));
+      this.zkfc = DFSZKFailoverController.create(
+          cluster.getConfiguration(idx));
     }
 
     @Override