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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2268) Disallow formatting the RMStateStore when there is an RM running
Date Wed, 22 Apr 2015 06:56:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-2268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14506544#comment-14506544

Rohith commented on YARN-2268:

Thanks [~vinodkv] and [~xgong] pinching in.
Trying to understand the approach, and some doubts
# Where does the lock file has been created? Is it in StateStore or HDFS or local file system?
If statestore/HDFS, there would be many error handling scenario's would occure like if RM
is killed then lock file remains in the statestore. This makes no other RM commands to execute.
Creating file in HDFS require additional dependencies on HDFS in RM.

> Disallow formatting the RMStateStore when there is an RM running
> ----------------------------------------------------------------
>                 Key: YARN-2268
>                 URL: https://issues.apache.org/jira/browse/YARN-2268
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Rohith
>         Attachments: 0001-YARN-2268.patch
> YARN-2131 adds a way to format the RMStateStore. However, it can be a problem if we format
the store while an RM is actively using it. It would be nice to fail the format if there is
an RM running and using this store. 

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