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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2946) DeadLocks in RMStateStore<->ZKRMStateStore
Date Wed, 24 Dec 2014 06:23:14 GMT

    [ https://issues.apache.org/jira/browse/YARN-2946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258030#comment-14258030

Rohith commented on YARN-2946:

Looking into last one year, there many deadlock issues reported!! It would be great if by
default HadoopQA can integrate JCarder tool or any other tool for identifying suspecious deadlock
cycles. Can it be integrated to QA? any thoughts in community?

> 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, 0004-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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