YARN-4313. Race condition in MiniMRYarnCluster when getting history

server address. Contributed by Jian He

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/MiniMRYarnCluster.java

@@ -190,6 +190,7 @@ public class MiniMRYarnCluster extends MiniYARNCluster {
     public JobHistoryServerWrapper() {
       super(JobHistoryServerWrapper.class.getName());
     }
+    private volatile boolean jhsStarted = false;
 
     @Override
     public synchronized void serviceStart() throws Exception {
@@ -211,9 +212,11 @@ public class MiniMRYarnCluster extends MiniYARNCluster {
         new Thread() {
           public void run() {
             historyServer.start();
+            jhsStarted = true;
           };
         }.start();
-        while (historyServer.getServiceState() == STATE.INITED) {
+
+        while (!jhsStarted) {
           LOG.info("Waiting for HistoryServer to start...");
           Thread.sleep(1500);
         }

hadoop-yarn-project/CHANGES.txt

@@ -1144,6 +1144,9 @@ Release 2.7.2 - UNRELEASED
     YARN-4183. Enabling generic application history forces every job to get a
     timeline service delegation token (Mit Desai via jeagles)
 
+    YARN-4313. Race condition in MiniMRYarnCluster when getting history server
+    address. (Jian He via xgong)
+
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES