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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1816) ClientCnxn.close() should block until threads have died
Date Tue, 08 Nov 2016 04:08:58 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15646422#comment-15646422

Hadoop QA commented on ZOOKEEPER-1816:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 440e0923dd9e3be533a196fdd6ada960860ca7f6.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 19 new Findbugs (version 3.0.1) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/3529//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/3529//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/3529//console

This message is automatically generated.

> ClientCnxn.close() should block until threads have died
> -------------------------------------------------------
>                 Key: ZOOKEEPER-1816
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1816
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.3.6, 3.4.5
>            Reporter: Jared Winick
>            Priority: Minor
>             Fix For: 3.4.10
>         Attachments: ZOOKEEPER-1816.patch
> In the testing of ACCUMULO-1379 and ACCUMULO-1858 it was seen that the non-blocking behavior
of ClientCnxn.close(), and therefore ZooKeeper.close(), can cause a race condition when undeploying
an application running in a Java container such as JBoss or Tomcat. As the close() method
returns without joining on the sendThread and eventThread, those threads continue to execute/cleanup
while the container is cleaning up the application's resources. If the container has unloaded
classes by the time this code runs
> {code}
> ZooTrace.logTraceMessage(LOG, ZooTrace.getTextTraceLevel(), "SendThread exitedloop.");
> {code}
> A "java.lang.NoClassDefFoundError: org/apache/zookeeper/server/ZooTrace" can be seen.

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