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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1641) ZK store should attempt a write periodically to ensure it is still Active
Date Thu, 13 Feb 2014 11:15:45 GMT

    [ https://issues.apache.org/jira/browse/YARN-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13900234#comment-13900234
] 

Hudson commented on YARN-1641:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #480 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/480/])
YARN-1641. ZK store should attempt a write periodically to ensure it is still Active. (kasha)
(kasha: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1567628)
* /hadoop/common/trunk/hadoop-yarn-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/RMStateStore.java
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestZKRMStateStore.java


> ZK store should attempt a write periodically to ensure it is still Active
> -------------------------------------------------------------------------
>
>                 Key: YARN-1641
>                 URL: https://issues.apache.org/jira/browse/YARN-1641
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.3.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>             Fix For: 2.4.0
>
>         Attachments: yarn-1641-1.patch, yarn-1641-2.patch
>
>
> Fencing in ZK store kicks in when the RM tries to write something to the store. If the
RM doesn't write anything to the store, it doesn't get fenced and can continue to assume being
the Active. 
> By periodically writing a file (say, every RM_ZK_TIMEOUT_MS seconds), we can ensure it
gets fenced.



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