MAPREDUCE-6927. MR job should only set tracking url if history was successfully written. Contributed by Eric Badger

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java

@@ -63,6 +63,7 @@ import org.apache.hadoop.mapreduce.v2.jobhistory.FileNameIndexUtils;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JobHistoryUtils;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JobIndexInfo;
+import org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.util.StringUtils;
@@ -1404,7 +1405,12 @@ public class JobHistoryEventHandler extends AbstractService
         qualifiedDoneFile =
             doneDirFS.makeQualified(new Path(doneDirPrefixPath,
                 doneJobHistoryFileName));
-        moveToDoneNow(qualifiedLogFile, qualifiedDoneFile);
+        if(moveToDoneNow(qualifiedLogFile, qualifiedDoneFile)) {
+          String historyUrl = MRWebAppUtil.getApplicationWebURLOnJHSWithScheme(
+              getConfig(), context.getApplicationID());
+          context.setHistoryUrl(historyUrl);
+          LOG.info("Set historyUrl to " + historyUrl);
+        }
       }
 
       // Move confFile to Done Folder
@@ -1610,7 +1616,7 @@ public class JobHistoryEventHandler extends AbstractService
     }
   }
 
-  private void moveTmpToDone(Path tmpPath) throws IOException {
+  protected void moveTmpToDone(Path tmpPath) throws IOException {
     if (tmpPath != null) {
       String tmpFileName = tmpPath.getName();
       String fileName = getFileNameFromTmpFN(tmpFileName);
@@ -1622,7 +1628,9 @@ public class JobHistoryEventHandler extends AbstractService
   
   // TODO If the FS objects are the same, this should be a rename instead of a
   // copy.
-  private void moveToDoneNow(Path fromPath, Path toPath) throws IOException {
+  protected boolean moveToDoneNow(Path fromPath, Path toPath)
+      throws IOException {
+    boolean success = false;
     // check if path exists, in case of retries it may not exist
     if (stagingDirFS.exists(fromPath)) {
       LOG.info("Copying " + fromPath.toString() + " to " + toPath.toString());
@@ -1631,13 +1639,18 @@ public class JobHistoryEventHandler extends AbstractService
       boolean copied = FileUtil.copy(stagingDirFS, fromPath, doneDirFS, toPath,
           false, getConfig());
 
-      if (copied)
-        LOG.info("Copied to done location: " + toPath);
-      else 
-        LOG.info("copy failed");
       doneDirFS.setPermission(toPath, new FsPermission(
           JobHistoryUtils.HISTORY_INTERMEDIATE_FILE_PERMISSIONS));
+      if (copied) {
+        LOG.info("Copied from: " + fromPath.toString()
+            + " to done location: " + toPath.toString());
+        success = true;
+      } else {
+        LOG.info("Copy failed from: " + fromPath.toString()
+            + " to done location: " + toPath.toString());
+      }
     }
+    return success;
   }
 
   private String getTempFileName(String srcFile) {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/AppContext.java

@@ -69,4 +69,8 @@ public interface AppContext {
   String getNMHostname();
 
   TaskAttemptFinishingMonitor getTaskAttemptFinishingMonitor();
+
+  String getHistoryUrl();
+
+  void setHistoryUrl(String historyUrl);
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java

@@ -1078,6 +1078,7 @@ public class MRAppMaster extends CompositeService {
     private final ClientToAMTokenSecretManager clientToAMTokenSecretManager;
     private TimelineClient timelineClient = null;
     private TimelineV2Client timelineV2Client = null;
+    private String historyUrl = null;
 
     private final TaskAttemptFinishingMonitor taskAttemptFinishingMonitor;
 
@@ -1197,6 +1198,16 @@ public class MRAppMaster extends CompositeService {
     public TimelineV2Client getTimelineV2Client() {
       return timelineV2Client;
     }
+
+    @Override
+    public String getHistoryUrl() {
+      return historyUrl;
+    }
+
+    @Override
+    public void setHistoryUrl(String historyUrl) {
+      this.historyUrl = historyUrl;
+    }
   }
 
   @SuppressWarnings("unchecked")

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMCommunicator.java

@@ -215,9 +215,7 @@ public abstract class RMCommunicator extends AbstractService
     }
     LOG.info("Setting job diagnostics to " + sb.toString());
 
-    String historyUrl =
-        MRWebAppUtil.getApplicationWebURLOnJHSWithScheme(getConfig(),
-            context.getApplicationID());
+    String historyUrl = context.getHistoryUrl();
     LOG.info("History url is " + historyUrl);
     FinishApplicationMasterRequest request =
         FinishApplicationMasterRequest.newInstance(finishState,

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/jobhistory/TestJobHistoryEventHandler.java

@@ -21,6 +21,9 @@ package org.apache.hadoop.mapreduce.jobhistory;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
@@ -62,6 +65,7 @@ import org.apache.hadoop.mapreduce.v2.app.job.JobStateInternal;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig;
 import org.apache.hadoop.mapreduce.v2.jobhistory.JobHistoryUtils;
 import org.apache.hadoop.mapreduce.v2.util.MRBuilderUtils;
+import org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil;
 import org.apache.hadoop.security.authorize.AccessControlList;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
@@ -920,6 +924,104 @@ public class TestJobHistoryEventHandler {
         jheh.lastEventHandled.getHistoryEvent()
         instanceof JobUnsuccessfulCompletionEvent);
   }
+
+  @Test (timeout=50000)
+  public void testSetTrackingURLAfterHistoryIsWritten() throws Exception {
+    TestParams t = new TestParams(true);
+    Configuration conf = new Configuration();
+
+    JHEvenHandlerForTest realJheh =
+        new JHEvenHandlerForTest(t.mockAppContext, 0, false);
+    JHEvenHandlerForTest jheh = spy(realJheh);
+    jheh.init(conf);
+
+    try {
+      jheh.start();
+      handleEvent(jheh, new JobHistoryEvent(t.jobId, new AMStartedEvent(
+          t.appAttemptId, 200, t.containerId, "nmhost", 3000, 4000, -1)));
+      verify(jheh, times(0)).processDoneFiles(any(JobId.class));
+      verify(t.mockAppContext, times(0)).setHistoryUrl(any(String.class));
+
+      // Job finishes and successfully writes history
+      handleEvent(jheh, new JobHistoryEvent(t.jobId, new JobFinishedEvent(
+          TypeConverter.fromYarn(t.jobId), 0, 0, 0, 0, 0, new Counters(),
+          new Counters(), new Counters())));
+
+      verify(jheh, times(1)).processDoneFiles(any(JobId.class));
+      String historyUrl = MRWebAppUtil.getApplicationWebURLOnJHSWithScheme(
+          conf, t.mockAppContext.getApplicationID());
+      verify(t.mockAppContext, times(1)).setHistoryUrl(historyUrl);
+    } finally {
+      jheh.stop();
+    }
+  }
+
+  @Test (timeout=50000)
+  public void testDontSetTrackingURLIfHistoryWriteFailed() throws Exception {
+    TestParams t = new TestParams(true);
+    Configuration conf = new Configuration();
+
+    JHEvenHandlerForTest realJheh =
+        new JHEvenHandlerForTest(t.mockAppContext, 0, false);
+    JHEvenHandlerForTest jheh = spy(realJheh);
+    jheh.init(conf);
+
+    try {
+      jheh.start();
+      doReturn(false).when(jheh).moveToDoneNow(any(Path.class),
+          any(Path.class));
+      doNothing().when(jheh).moveTmpToDone(any(Path.class));
+      handleEvent(jheh, new JobHistoryEvent(t.jobId, new AMStartedEvent(
+          t.appAttemptId, 200, t.containerId, "nmhost", 3000, 4000, -1)));
+      verify(jheh, times(0)).processDoneFiles(any(JobId.class));
+      verify(t.mockAppContext, times(0)).setHistoryUrl(any(String.class));
+
+      // Job finishes, but doesn't successfully write history
+      handleEvent(jheh, new JobHistoryEvent(t.jobId, new JobFinishedEvent(
+          TypeConverter.fromYarn(t.jobId), 0, 0, 0, 0, 0, new Counters(),
+          new Counters(), new Counters())));
+      verify(jheh, times(1)).processDoneFiles(any(JobId.class));
+      verify(t.mockAppContext, times(0)).setHistoryUrl(any(String.class));
+
+    } finally {
+      jheh.stop();
+    }
+  }
+  @Test (timeout=50000)
+  public void testDontSetTrackingURLIfHistoryWriteThrows() throws Exception {
+    TestParams t = new TestParams(true);
+    Configuration conf = new Configuration();
+
+    JHEvenHandlerForTest realJheh =
+        new JHEvenHandlerForTest(t.mockAppContext, 0, false);
+    JHEvenHandlerForTest jheh = spy(realJheh);
+    jheh.init(conf);
+
+    try {
+      jheh.start();
+      doThrow(new YarnRuntimeException(new IOException()))
+          .when(jheh).processDoneFiles(any(JobId.class));
+      handleEvent(jheh, new JobHistoryEvent(t.jobId, new AMStartedEvent(
+          t.appAttemptId, 200, t.containerId, "nmhost", 3000, 4000, -1)));
+      verify(jheh, times(0)).processDoneFiles(any(JobId.class));
+      verify(t.mockAppContext, times(0)).setHistoryUrl(any(String.class));
+
+      // Job finishes, but doesn't successfully write history
+      try {
+        handleEvent(jheh, new JobHistoryEvent(t.jobId, new JobFinishedEvent(
+            TypeConverter.fromYarn(t.jobId), 0, 0, 0, 0, 0, new Counters(),
+            new Counters(), new Counters())));
+        throw new RuntimeException(
+            "processDoneFiles didn't throw, but should have");
+      } catch (YarnRuntimeException yre) {
+        // Exception expected, do nothing
+      }
+      verify(jheh, times(1)).processDoneFiles(any(JobId.class));
+      verify(t.mockAppContext, times(0)).setHistoryUrl(any(String.class));
+    } finally {
+      jheh.stop();
+    }
+  }
 }
 
 class JHEvenHandlerForTest extends JobHistoryEventHandler {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MockAppContext.java

@@ -154,4 +154,14 @@ public class MockAppContext implements AppContext {
       return null;
   }
 
+  @Override
+  public String getHistoryUrl() {
+    return null;
+  }
+
+  @Override
+  public void setHistoryUrl(String historyUrl) {
+    return;
+  }
+
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestRuntimeEstimators.java

@@ -896,5 +896,15 @@ public class TestRuntimeEstimators {
     public TaskAttemptFinishingMonitor getTaskAttemptFinishingMonitor() {
       return null;
     }
+
+    @Override
+    public String getHistoryUrl() {
+      return null;
+    }
+
+    @Override
+    public void setHistoryUrl(String historyUrl) {
+      return;
+    }
   }
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/JobHistory.java

@@ -407,4 +407,14 @@ public class JobHistory extends AbstractService implements HistoryContext {
   public TaskAttemptFinishingMonitor getTaskAttemptFinishingMonitor() {
     return null;
   }
+
+  @Override
+  public String getHistoryUrl() {
+    return null;
+  }
+
+  @Override
+  public void setHistoryUrl(String historyUrl) {
+    return;
+  }
 }