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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10873) Control number of regions assigned to backup masters
Date Mon, 21 Apr 2014 20:39:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13976006#comment-13976006
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Enis Soztutar commented on HBASE-10873:
---------------------------------------

bq. Sounds like you'd like us to replicate the old deploy layout Enis Soztutar but with option
to move to the 'new'.
Yes. Least amount of surprises. Since we are right now defaulting to master having no user
level regions, we should also default to backup masters not having any user level regions.

It may be ok to change the defaults so that both active and backup masters have normal region
load (weight 1), but I think we should be consistent for region loads of active and backup
masters. Since META is already shared in 0.98- setups, it should be fine to have master be
just another region server. In that case, we do not even need this issue? 


> 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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