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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12007) StochasticBalancer should avoid putting user regions on master
Date Fri, 19 Sep 2014 15:43:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140753#comment-14140753
] 

Jimmy Xiang commented on HBASE-12007:
-------------------------------------

bq. We have two mechanisms for distributing regions on a cluster?
Regions on master are handled with balanceMasterRegions which is internal to the balancer.
bq. In branch-1, master can carry regions? DIdn't we disable that for branch-1?
Yes, it still can, if configured. It doesn't host any region by default.
bq. Or is it not possible to undo M being a RS?
Very hard, and it is useful for most of use cases.
bq. We could assign to backup master?
Yes, that's right.

> StochasticBalancer should avoid putting user regions on master
> --------------------------------------------------------------
>
>                 Key: HBASE-12007
>                 URL: https://issues.apache.org/jira/browse/HBASE-12007
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>         Attachments: hbase-12007.patch
>
>
> We should enhance how StochasticBalancer picks up a random server so that it can avoid
putting user regions on master, because regions on master are handled differently in a separate
method.



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