HDFS-3432. TestDFSZKFailoverController tries to fail over too early. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-3042@1339434 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -22,6 +22,7 @@ import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 
+import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -43,7 +44,8 @@ import com.google.common.base.Preconditions;
  * Classes which need callbacks should implement the {@link Callback}
  * interface.
  */
-class HealthMonitor {
+@InterfaceAudience.Private
+public class HealthMonitor {
   private static final Log LOG = LogFactory.getLog(
       HealthMonitor.class);
 
@@ -75,7 +77,8 @@ class HealthMonitor {
   private HAServiceStatus lastServiceState = new HAServiceStatus(
       HAServiceState.INITIALIZING);
   
-  enum State {
+  @InterfaceAudience.Private
+  public enum State {
     /**
      * The health monitor is still starting up.
      */

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

@@ -170,11 +170,7 @@ public class MiniZKFCCluster {
    */
   public void waitForHealthState(int idx, State state)
       throws Exception {
-    ZKFailoverController zkfc = thrs[idx].zkfc; 
-    while (zkfc.getLastHealthState() != state) {
-      ctx.checkException();
-      Thread.sleep(50);
-    }
+    ZKFCTestUtil.waitForHealthState(thrs[idx].zkfc, state, ctx);
   }
 
   /**

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

@@ -0,0 +1,34 @@
+/**
+ * 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.ha;
+
+import org.apache.hadoop.test.MultithreadedTestUtil;
+
+public class ZKFCTestUtil {
+  
+  public static void waitForHealthState(ZKFailoverController zkfc,
+      HealthMonitor.State state,
+      MultithreadedTestUtil.TestContext ctx) throws Exception {
+    while (zkfc.getLastHealthState() != state) {
+      if (ctx != null) {
+        ctx.checkException();
+      }
+      Thread.sleep(50);
+    }
+  }
+}

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

@@ -15,3 +15,5 @@ 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)
+
+HDFS-3432. TestDFSZKFailoverController tries to fail over too early (todd)

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

@@ -26,6 +26,8 @@ import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.ha.ClientBaseWithFixes;
+import org.apache.hadoop.ha.HealthMonitor;
+import org.apache.hadoop.ha.ZKFCTestUtil;
 import org.apache.hadoop.ha.ZKFailoverController;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.ha.TestNodeFencer.AlwaysSucceedFencer;
@@ -91,6 +93,12 @@ public class TestDFSZKFailoverController extends ClientBaseWithFixes {
     ctx.addThread(thr2 = new ZKFCThread(ctx, 1));
     thr2.start();
     
+    // Wait for the ZKFCs to fully start up
+    ZKFCTestUtil.waitForHealthState(thr1.zkfc,
+        HealthMonitor.State.SERVICE_HEALTHY, ctx);
+    ZKFCTestUtil.waitForHealthState(thr2.zkfc,
+        HealthMonitor.State.SERVICE_HEALTHY, ctx);
+    
     fs = HATestUtil.configureFailoverFs(cluster, conf);
   }
   
@@ -160,10 +168,12 @@ public class TestDFSZKFailoverController extends ClientBaseWithFixes {
   public void testManualFailoverWithDFSHAAdmin() throws Exception {
     DFSHAAdmin tool = new DFSHAAdmin();
     tool.setConf(conf);
-    tool.run(new String[]{"-failover", "nn1", "nn2"});
+    assertEquals(0, 
+        tool.run(new String[]{"-failover", "nn1", "nn2"}));
     waitForHAState(0, HAServiceState.STANDBY);
     waitForHAState(1, HAServiceState.ACTIVE);
-    tool.run(new String[]{"-failover", "nn2", "nn1"});
+    assertEquals(0,
+        tool.run(new String[]{"-failover", "nn2", "nn1"}));
     waitForHAState(0, HAServiceState.ACTIVE);
     waitForHAState(1, HAServiceState.STANDBY);
   }