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https://issues.apache.org/jira/browse/HDFS-6300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14534186#comment-14534186
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Rakesh R commented on HDFS-6300:
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Thanks [~vinayrpet] for the review comments. Yes you are correct, the test is
flaky. I've modified the test case to ensure the {{first balancer}} is running
when triggering the {{second balancer}}. Kindly take a look at the patch again.
> Shouldn't 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 & mover
> Reporter: Rakesh R
> Assignee: Rakesh R
> Labels: BB2015-05-RFC
> Attachments: HDFS-6300-001.patch, HDFS-6300-002.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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