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Posted to yarn-dev@hadoop.apache.org by "Chengbing Liu (JIRA)" <ji...@apache.org> on 2015/02/09 13:52:35 UTC

[jira] [Created] (YARN-3160) Non-atomic operation on nodeUpdateQueue in RMNodeImpl

Chengbing Liu created YARN-3160:
-----------------------------------

             Summary: Non-atomic operation on nodeUpdateQueue in RMNodeImpl
                 Key: YARN-3160
                 URL: https://issues.apache.org/jira/browse/YARN-3160
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.7.0
            Reporter: Chengbing Liu
            Assignee: Chengbing Liu


{code:title=Bar.java|borderStyle=solid}
while(nodeUpdateQueue.peek() != null){
  latestContainerInfoList.add(nodeUpdateQueue.poll());
}
{code}
The above code brings potential risk of adding null value to {{latestContainerInfoList}}. Since {{ConcurrentLinkedQueue}} implements a wait-free algorithm, we can directly poll the queue, before checking whether the value is null.



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