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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