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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5694) ZKRMStateStore can prevent the transition to standby in branch-2.7 if the ZK node is unreachable
Date Fri, 09 Dec 2016 07:56:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734622#comment-15734622

Brahma Reddy Battula commented on YARN-5694:

[~jianhe] can you update changes.txt for branch-2.7

> ZKRMStateStore can prevent the transition to standby in branch-2.7 if the ZK node is
> ------------------------------------------------------------------------------------------------
>                 Key: YARN-5694
>                 URL: https://issues.apache.org/jira/browse/YARN-5694
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.3
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>              Labels: oct16-medium
>             Fix For: 2.6.5, 2.7.4
>         Attachments: YARN-5694.001.patch, YARN-5694.002.patch, YARN-5694.003.patch, YARN-5694.004.patch,
YARN-5694.004.patch, YARN-5694.005.patch, YARN-5694.006.patch, YARN-5694.007.patch, YARN-5694.008.patch,
YARN-5694.branch-2.6.001.patch, YARN-5694.branch-2.6.002.patch, YARN-5694.branch-2.7.001.patch,
YARN-5694.branch-2.7.002.patch, YARN-5694.branch-2.7.004.patch, YARN-5694.branch-2.7.005.patch
> {{ZKRMStateStore.doStoreMultiWithRetries()}} holds the lock while trying to talk to ZK.
 If the connection fails, it will retry while still holding the lock.  The retries are intended
to be strictly time limited, but in the case that the ZK node is unreachable, the time limit
fails, resulting in the thread holding the lock for over an hour.  Transitioning the RM to
standby requires that same lock, so in exactly the case that the RM should be transitioning
to standby, the {{VerifyActiveStatusThread}} blocks it from happening.

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