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https://issues.apache.org/jira/browse/HBASE-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302862#comment-14302862
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hongyu bi commented on HBASE-12957:
-----------------------------------
IMO, isSuccessfulScan is called to make sure the target region is online and
serving ,or it'll throw
TableNotFoundException/TableNotEnabledException/NotServingRegionException.It's
not have to make sure we find the first item.
please correct me if wrong.
thanks stack:)
> region_mover#isSuccessfulScan may extremely slow on region with lots of
> expired data
> ------------------------------------------------------------------------------------
>
> Key: HBASE-12957
> URL: https://issues.apache.org/jira/browse/HBASE-12957
> Project: HBase
> Issue Type: Improvement
> Components: scripts
> Reporter: hongyu bi
> Priority: Minor
> Attachments: HBASE-12957-v0.patch
>
>
> region_mover will call isSuccessfulScan when region has moved to make sure
> it's healthy, however , if the moved region has lots of expired data
> region_mover#isSuccessfulScan will take a long time to finish ,that may even
> exceed "lease timeout".So I made isSuccessfulScan a get-like scan to achieve
> faster response in that case.
> workaround:before graceful_stop/rolling_restart ，call major_compact on the
> table with small TTL
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