lujie created HDFS-13452:

             Summary: Two Potential NPE 
                 Key: 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:
List<String> children = ZKUtil.listChildrenAndWatchForNewChildren(zkw, 
if (children == null) {
    return Collections.emptyList();
but another two callers do not have null 

We attach the patch to fix this probelm.(We found this bug by  tool 

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