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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6300) Allows to run multiple balancer simultaneously
Date Wed, 30 Apr 2014 04:35:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13985155#comment-13985155
] 

Rakesh R commented on HDFS-6300:
--------------------------------

Could someone help me to validate the scenario and the proposed fix. The problem I could see
is, fs.create(BALANCER_ID_PATH) is allowing to do OVER_WRITE=true, when another balancer comes
its not getting the 'AlreadyBeingCreatedException' and start perform balancing.
Thanks,
Rakesh

> Allows to run multiple balancer simultaneously
> ----------------------------------------------
>
>                 Key: HDFS-6300
>                 URL: https://issues.apache.org/jira/browse/HDFS-6300
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>             Fix For: 2.5.0
>
>         Attachments: HDFS-6300.patch
>
>
> Javadoc of "Balancer.java" says, it will not allow to run second balancer if the first
one is in progress. But I've noticed multiple can run together and balancer.id implementation
is not safe guarding.
> {code}
>  * <li>Another balancer is running. Exiting...
> {code}



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