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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10873) Control number of regions assigned to backup masters
Date Tue, 15 Apr 2014 20:42:15 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jimmy Xiang updated HBASE-10873:
--------------------------------

    Status: Patch Available  (was: Open)

Attached patch v2 that addressed Matteo's review comments. 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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