[jira] [Commented] (HDFS-6300) Prevent multiple balancers from running simultaneously

["Rakesh R (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-6300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14541302#comment-14541302 ] 

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

Thanks [~szetszwo]. Attached another patch addressing the previous comments. Also, I've tried one more test case to simulate the case where another balancer successfully performs {{append}} operation and gone ahead with balancing. Kindly review the patch again.

> Prevent multiple balancers from running simultaneously
> ------------------------------------------------------
>
>                 Key: HDFS-6300
>                 URL: https://issues.apache.org/jira/browse/HDFS-6300
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>            Priority: Critical
>              Labels: BB2015-05-RFC
>         Attachments: HDFS-6300-001.patch, HDFS-6300-002.patch, HDFS-6300-003.patch, HDFS-6300-004.patch, 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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