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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10873) Control number of regions assigned to backup masters
Date Fri, 18 Apr 2014 00:02:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973598#comment-13973598
] 

Jimmy Xiang commented on HBASE-10873:
-------------------------------------

[~enis], what do you think? Are you ok to get this patch in? Thanks.

> Control number of regions assigned to backup masters
> ----------------------------------------------------
>
>                 Key: HBASE-10873
>                 URL: https://issues.apache.org/jira/browse/HBASE-10873
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.99.0
>
>         Attachments: hbase-10873.patch, hbase-10873_v2.patch
>
>
> By default, a backup master is treated just like another regionserver. So it can host
as many regions as other regionserver does. When the backup master becomes the active one,
region balancer needs to move those user regions on this master to other region servers. To
minimize the impact, it's better not to assign too many regions on backup masters. It may
not be good to leave the backup masters idle and not host any region either.
> We should make this adjustable so that users can control how many regions to assign to
each backup master.



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