[jira] [Created] (ZOOKEEPER-1755) Concurrent operations of four letter 'dump' ephemeral command and killSession causing NPE

["Rakesh R (JIRA)" <ji...@apache.org>]

Rakesh R created ZOOKEEPER-1755:
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             Summary: Concurrent operations of four letter 'dump' ephemeral command and killSession causing NPE
                 Key: ZOOKEEPER-1755
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1755
             Project: ZooKeeper
          Issue Type: Bug
    Affects Versions: 3.4.5, 3.5.0
            Reporter: Rakesh R
            Assignee: Rakesh R


Potential problem occurs, when executing four letter 'dump' command and at the meantime zkserver has triggered session closure and removing the related information from the DataTree.

Please see the exception:
{code}
java.lang.NullPointerException
	at org.apache.zookeeper.server.DataTree.dumpEphemerals(DataTree.java:1278)
	at org.apache.zookeeper.server.DataTreeTest$1.run(DataTreeTest.java:82)
{code}

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