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https://issues.apache.org/jira/browse/HBASE-23035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931047#comment-16931047
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Guanghao Zhang commented on HBASE-23035:
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bq. You mean the RS is back online immediately?
Yes
bq. the default behavior in the old time, is to assign regions to all the live
servers to make them online soon...
Yes. This issue plan to change to the old behavior.
> Retain region to the last RegionServer make the failover slower
> ---------------------------------------------------------------
>
> Key: HBASE-23035
> URL: https://issues.apache.org/jira/browse/HBASE-23035
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0, 2.3.0, 2.2.1, 2.1.6
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Priority: Major
>
> Now if one RS crashed, the regions will try to use the old location for the
> region deploy. But one RS only have 3 threads to open region by default. If a
> RS have hundreds of regions, the failover is very slower. Assign to same RS
> may have good locality if the Datanode is deploied on same host. But slower
> failover make the availability worse. And the locality is not big deal when
> deploy HBase on cloud.
> This was introduced by HBASE-18946.
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