lujie created HDFS-13452:
----------------------------

             Summary: Two Potential NPE 
                 Key: HDFS-13452
                 URL: https://issues.apache.org/jira/browse/HDFS-13452
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: lujie


Callee ZKUtil#listChildrenAndWatchForNewChildren may return null, it has 8 
callers, 6 of the caller have null checker like:
{code:java}
List<String> children = ZKUtil.listChildrenAndWatchForNewChildren(zkw, 
zkw.znodePaths.rsZNode);
if (children == null) {
    return Collections.emptyList();
}
{code}
but another two callers do not have null 
checker:RSGroupInfoManagerImpl#retrieveGroupListFromZookeeper,ZKProcedureMemberRpcs#watchForAbortedProcedures.
 

We attach the patch to fix this probelm.(We found this bug by  tool 
[NPEDetector|https://github.com/lujiefsi/NPEDetector])



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