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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-231) Add persistent store implementation for RMStateStore
Date Tue, 20 Nov 2012 18:40:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501367#comment-13501367
] 

Bikas Saha commented on YARN-231:
---------------------------------

Both store have a similar design. Each app data and attempt data is stored in its own znode/file.
The names of the znodes/files are the app and attempt id's. This creates discrete units of
writes for each store operation and reduces potential areas of contention for downstream HA
work.
For loading the stored state, each app and attempt is parsed into its object. Attempts are
then placed into collections for their corresponding apps and orphans are discarded.
                
> Add persistent store implementation for RMStateStore
> ----------------------------------------------------
>
>                 Key: YARN-231
>                 URL: https://issues.apache.org/jira/browse/YARN-231
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>         Attachments: YARN-231.1.patch
>
>
> Add stores that write RM state data to ZooKeeper and FileSystem 

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