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

    https://github.com/apache/twill/pull/58#discussion_r132322316
  
    --- Diff: 
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
 ---
    @@ -239,14 +359,8 @@ protected void doStop() throws Exception {
         LOG.info("Stop application master with spec: {}",
                  
TwillRuntimeSpecificationAdapter.create().toJson(twillRuntimeSpec));
     
    -    if (eventHandler != null) {
    -      try {
    -        // call event handler destroy. If there is error, only log and not 
affected stop sequence.
    -        eventHandler.destroy();
    -      } catch (Throwable t) {
    -        LOG.warn("Exception when calling {}.destroy()", 
eventHandler.getClass().getName(), t);
    -      }
    -    }
    +    // call event handler destroy
    +    eventHandler.destroy();
    --- End diff --
    
    Shouldn't call `destroy()` here anymore. It should be called after call 
other calls to the event handler, as it is acted as a cleanup call.


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