Github user sihuazhou commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5931#discussion_r184831311
  
    --- Diff: 
flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java ---
    @@ -293,21 +293,16 @@ public void startNewWorker(ResourceProfile 
resourceProfile) {
        }
     
        @Override
    -   public boolean stopWorker(YarnWorkerNode workerNode) {
    -           if (workerNode != null) {
    -                   Container container = workerNode.getContainer();
    -                   log.info("Stopping container {}.", container.getId());
    -                   // release the container on the node manager
    -                   try {
    -                           
nodeManagerClient.stopContainer(container.getId(), container.getNodeId());
    -                   } catch (Throwable t) {
    -                           log.warn("Error while calling YARN Node Manager 
to stop container", t);
    -                   }
    -                   
resourceManagerClient.releaseAssignedContainer(container.getId());
    -                   workerNodeMap.remove(workerNode.getResourceID());
    -           } else {
    -                   log.error("Can not find container for null 
workerNode.");
    +   public boolean stopWorker(final YarnWorkerNode workerNode) {
    +           final Container container = workerNode.getContainer();
    +           log.info("Stopping container {}.", container.getId());
    +           try {
    +                   nodeManagerClient.stopContainer(container.getId(), 
container.getNodeId());
    +           } catch (final Exception e) {
    +                   log.warn("Error while calling YARN Node Manager to stop 
container", e);
    --- End diff --
    
    Previous version was the `Throwable` here, currently changed to 
`Exception`, what the reason here? Beside, if we change here from `Throwable` 
-> `Exception` then maybe we should also change the other places where have a 
similar operation with `nodeManagerClient` like here, e.g. 
    
    
![image](https://user-images.githubusercontent.com/7480427/39389518-e609686c-4abb-11e8-99df-b0cd013a58ef.png)



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