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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 Mon, 21 Apr 2014 21:15:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13976050#comment-13976050
] 

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

bq. In that case, we do not even need this issue?
This patch makes it possible to put some load on backup masters. So that users can make adjustments
per their need.  I hope we don't need this issue, if not for the region moving concern during
master failover.

bq. I'm not sure how we currently keep backup masters 'clear'.  Wouldn't we want it done in
the LB?
Yes, it's done in the LB.



> 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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