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https://issues.apache.org/jira/browse/HBASE-17784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15982298#comment-15982298
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Guangxu Cheng commented on HBASE-17784:
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bq.Shouldn't we correct these misplaced regions when balancing?
Load balancer can correct these misplaced regions.
But there may be the following problems.
1. If the Load Balancer is not enabled, we need to manually trigger it.
2. By default, the load balancer is executed once for 5 minutes, regions are
deployed in the incorrect group in this period, which is inconsistent with the
system.
It may also affect the stability of other groups
3. The load balancer may trigger more region migration, and these regions may
not need to move.
It is a better choice to check and move regions to the correct group when
starting master, which also makes the system more robust.
> Check if the regions are deployed in the correct group, and move it to the
> correct group when starting master
> -------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-17784
> URL: https://issues.apache.org/jira/browse/HBASE-17784
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Guangxu Cheng
> Assignee: Guangxu Cheng
> Fix For: 2.0.0
>
> Attachments: HBASE-17784-v1.patch
>
>
> During move_servers_rsgroups/move_tables_rsgroups, if master crashes, it may
> lead to some of the regions did not move to correct group.
> So when restart master, we should fix it.
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