[jira] [Commented] (HBASE-23035) Retain region to the last RegionServer make the failover slower

["Bo Cui (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-23035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17174189#comment-17174189 ] 

Bo Cui commented on HBASE-23035:
--------------------------------

{quote}And the locality is not big deal when deploy HBase on cloud.
{quote}
[~zghao]

hi, but some hbase cluster is not on the cloud, 

> 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: Improvement
>    Affects Versions: 3.0.0-alpha-1, 2.3.0, 2.2.1, 2.1.6
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.3.0, 2.1.7, 2.2.2
>
>
> 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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