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Posted to hdfs-dev@hadoop.apache.org by "lujie (JIRA)" <ji...@apache.org> on 2018/04/15 12:19:00 UTC
[jira] [Created] (HDFS-13452) Two Potential NPE
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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