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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-2946) Deadlock in ZKRMStateStore
Date Thu, 11 Dec 2014 15:30:13 GMT

     [ https://issues.apache.org/jira/browse/YARN-2946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rohith updated YARN-2946:
-------------------------
    Attachment: 0001-YARN-2946.patch

> Deadlock in ZKRMStateStore
> --------------------------
>
>                 Key: YARN-2946
>                 URL: https://issues.apache.org/jira/browse/YARN-2946
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Rohith
>            Assignee: Rohith
>            Priority: Blocker
>         Attachments: 0001-YARN-2946.patch, 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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