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https://issues.apache.org/jira/browse/HBASE-22738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902965#comment-16902965
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Guanghao Zhang commented on HBASE-22738:
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In my option, rs group feature is enabled as default in future. So there will
have a overall cluster balancer to fix the wrong assigns. And availability is
more important than the correctness of regions location. So if no regionservers
in group, fallback to default rsgroup. If no regionservers in default rsgroup,
fallback to any rsgroup which have online regionservers. Maybe sort them by
regionserver number or load.
> Fallback to default group to choose RS when there are no RS in current group
> ----------------------------------------------------------------------------
>
> Key: HBASE-22738
> URL: https://issues.apache.org/jira/browse/HBASE-22738
> Project: HBase
> Issue Type: Bug
> Reporter: Guanghao Zhang
> Priority: Major
>
> We configure one regionserver for hbase system table. But when rolling
> upgrade, you need move the region to other regionservers. But because there
> are no other regionservers in this group, you cannot move the region...
>
>
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