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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2946) DeadLocks in RMStateStore<->ZKRMStateStore
Date Tue, 23 Dec 2014 12:50:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256945#comment-14256945
] 

Hadoop QA commented on YARN-2946:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12688829/0003-YARN-2946.patch
  against trunk revision 5caebba.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 15 new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/6174//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-YARN-Build/6174//artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/6174//console

This message is automatically generated.

> DeadLocks in RMStateStore<->ZKRMStateStore
> ------------------------------------------
>
>                 Key: YARN-2946
>                 URL: https://issues.apache.org/jira/browse/YARN-2946
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Rohith
>            Assignee: Rohith
>            Priority: Blocker
>         Attachments: 0001-YARN-2946.patch, 0001-YARN-2946.patch, 0002-YARN-2946.patch,
0003-YARN-2946.patch, 0003-YARN-2946.patch, RM_BeforeFix_Deadlock_cycle_1.png, RM_BeforeFix_Deadlock_cycle_2.png,
TestYARN2946.java
>
>
> Found one deadlock in ZKRMStateStore.
> # Initial stage zkClient is null because of zk disconnected event.
> # When ZKRMstatestore#runWithCheck()  wait(zkSessionTimeout) for zkClient to re establish
zookeeper connection either via synconnected or expired event, it is highly possible that
any other thred can obtain lock on {{ZKRMStateStore.this}} from state machine transition events.
This cause Deadlock in ZKRMStateStore.



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