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https://issues.apache.org/jira/browse/ZOOKEEPER-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899390#comment-13899390
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Raul Gutierrez Segales commented on ZOOKEEPER-1755:
---------------------------------------------------
Nice patch [~rakeshr].
Trivial nits:
{noformat}
+ LOG.info("Create " + count + " sessions and its ephemeral nodes");
...
+ LOG.error("Received exception while dumpEphemerals!", e);
...
+ LOG.debug("Killing " + count
+ + " ZooKeeper client sessions and its ephemeral nodes");
{noformat}
extrapolation instead of concatenation.
> 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
> Components: server
> Affects Versions: 3.4.5
> Reporter: Rakesh R
> Assignee: Rakesh R
> Fix For: 3.4.7, 3.5.0
>
> Attachments: 0001-ZOOKEEPER-1755-branch-3_4.patch,
> 0001-ZOOKEEPER-1755-trunk-version.patch
>
>
> 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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