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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1448) Node+Quota creation in transaction log can crash leader startup
Date Thu, 05 Sep 2013 21:43:52 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759501#comment-13759501

Hadoop QA commented on ZOOKEEPER-1448:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1519655.

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

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +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 does not introduce any new Findbugs (version 1.3.9) 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/1556//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/1556//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/1556//console

This message is automatically generated.
> Node+Quota creation in transaction log can crash leader startup
> ---------------------------------------------------------------
>                 Key: ZOOKEEPER-1448
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1448
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.5
>            Reporter: Botond Hejj
>            Assignee: Flavio Junqueira
>            Priority: Critical
>             Fix For: 3.5.0, 3.4.6
>         Attachments: ZOOKEEPER-1448_branch3.3.patch, ZOOKEEPER-1448.patch, ZOOKEEPER-1448.patch,
ZOOKEEPER-1448.patch, ZOOKEEPER-1448.patch, ZOOKEEPER-1448.patch, ZOOKEEPER-1448-trunk.patch
> Hi,
> I've found a bug in zookeeper related to quota creation which can shutdown zookeeper
leader on startup.
> Steps to reproduce:
> 1. create /quota_bug
> 2. setquota -n 10000 /quota_bug
> 3. stop the whole ensemble (the previous operations should be in the transaction log)
> 4. start all the servers
> 5. the elected leader will shutdown with an exception (Missing stat node for count /zookeeper/quota/quota_bug/zookeeper_
> stats)
> I've debugged a bit what happening and I found the following problem:
> On startup each server loads the last snapshot and replays the last transaction log.
While doing this it fills up the pTrie variable of the DataTree with the path of the nodes
which have quota.
> After the leader is elected the leader servers loads the snapshot and last transaction
log but it doesn't clean up the pTrie variable. This means it still contains the "/quota_bug"
path. Now when the "create /quota_bug" is processed from the transaction log the DataTree
already thinks that the quota nodes ("/zookeeper/quota/quota_bug/zookeeper_limits" and "/zookeeper/quota/quota_bug/zookeeper_stats")
are created but those node creation actually comes later in the transaction log. This leads
to the missing stat node exception.
> I think clearing the pTrie should solve this problem.

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