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https://issues.apache.org/jira/browse/HBASE-10873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974271#comment-13974271
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Enis Soztutar commented on HBASE-10873:
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bq. I think that's the issue we'd like to enhance. We want the region server
hosting meta doesn't host too many heavy regions so that we can improve the
meta availability, right?
We already have separate priority handlers and separate wal, etc in place
right? Plus the active master right now only hosts system tables, so this is
not a problem for backup masters right? Are you concerned with the failover?
bq. Currently, we already support all or nothing. With this patch, it will make
it more flexible so that users don't have to leave those backup masters totally
idle, they don't need to worry too much about region movement/data locality in
case each region server hosts many regions.
Fair enough, but configuring this for a cluster is still not clear. What value
should we default? What value should a 20 node cluster use, etc. It might be ok
if we default to backups not hosting any regions. Then if the user prefers to
use the capacity, they can explicitly request so.
> 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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