lujie created YARN-8164:

             Summary: Fix an Potential NPE 
                 Key: YARN-8164
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: lujie

We have developed a static analysis tool 
[NPEDetector|] to find some potential 
NPE. Our analysis shows that some callees may return null in corner case(e.g. 
node crash , IO exception), some of their callers have  _!=null_ check but some 
do not have.

Callee FairScheduler#getAppsInQueue can return null
public List<ApplicationAttemptId> getAppsInQueue(String queueName) {
    FSQueue queue = queueMgr.getQueue(queueName);
   if (queue == null) {
      return null;//here
it has 4 callers, three of them have null checker, one dost not have. In this 
issue we post a patch which can add  !=null  based on existed !=null  check.

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