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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13316) Reduce the downtime on panned moves of regions
Date Mon, 23 Mar 2015 17:12:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376214#comment-14376214
] 

Elliott Clark commented on HBASE-13316:
---------------------------------------

Is there a way to move the warm up call into a thread pool so that bulk assign doesn't have
a blocking call done in serial?
Is there an issue if warm up is running while an open for that region is sent?

Nits:
There are a bunch of * imports. We generally try and stay away from those.
There are javadoc @params that aren't filled out. Either remove them or fill them out.

> Reduce the downtime on panned moves of regions
> ----------------------------------------------
>
>                 Key: HBASE-13316
>                 URL: https://issues.apache.org/jira/browse/HBASE-13316
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer
>    Affects Versions: 2.0.0, 1.0.1, 1.1.1
>            Reporter: Sameet Agarwal
>            Assignee: Sameet Agarwal
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: PlannedFailover.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> The current behavior of a region move shuts down a region and then starts is up in another
regionserver. This causes increased latency and possibly timeouts till the new region's cache
is fully warmed up. We can make a region move less disruptive by warming the cache in the
destination region server before shutting dow the old region.
>  



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