YARN-3010. Fixed findbugs warning in AbstractYarnScheduler. Contributed by Yi Liu

hadoop-yarn-project/CHANGES.txt

@@ -328,6 +328,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2230. Fixed few configs description in yarn-default.xml. (Vijay Bhat
     via jianhe)
 
+    YARN-3010. Fixed findbugs warning in AbstractYarnScheduler. (Yi Liu via
+    jianhe)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/AbstractYarnScheduler.java

@@ -189,8 +189,8 @@ protected void initMaximumResourceCapability(Resource maximumAllocation) {
     }
   }
 
-  protected void containerLaunchedOnNode(ContainerId containerId,
-                                         SchedulerNode node) {
+  protected synchronized void containerLaunchedOnNode(
+      ContainerId containerId, SchedulerNode node) {
     // Get the application for the finished container
     SchedulerApplicationAttempt application = getCurrentAttemptForContainer
         (containerId);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java

@@ -249,7 +249,8 @@ public CapacitySchedulerConfiguration getConfiguration() {
   }
 
   @Override
-  public RMContainerTokenSecretManager getContainerTokenSecretManager() {
+  public synchronized RMContainerTokenSecretManager 
+  getContainerTokenSecretManager() {
     return this.rmContext.getContainerTokenSecretManager();
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java

@@ -1232,7 +1232,7 @@ public void handle(SchedulerEvent event) {
     }
   }
 
-  private String resolveReservationQueueName(String queueName,
+  private synchronized String resolveReservationQueueName(String queueName,
       ApplicationId applicationId, ReservationId reservationID) {
     FSQueue queue = queueMgr.getQueue(queueName);
     if ((queue == null) || !allocConf.isReservable(queue.getQueueName())) {