zhihai xu created YARN-2324:
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             Summary: Race condition in continuousScheduling for FairScheduler
                 Key: YARN-2324
                 URL: https://issues.apache.org/jira/browse/YARN-2324
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: zhihai xu


Race condition in continuousScheduling for FairScheduler.
removeNode can run when continuousScheduling is called in schedulingThread. If 
the node is removed from nodes, nodes.get(n2) and getFSSchedulerNode(nodeId) 
will be null. So we need add lock to remove the NPE/race conditions.



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