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https://issues.apache.org/jira/browse/HBASE-21251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16647851#comment-16647851
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Guanghao Zhang commented on HBASE-21251:
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We used this tool in our cluster but the cliend side time of moving one region
is 10 seconds. I didn't use a profiling tool to analyze why it is too slow...
Just read the code and refactor. And I test the new implemeantion in our
cluster. The time of moving one region reduced from 10 seconds to 0.6 seconds...
> Refactor RegionMover
> --------------------
>
> Key: HBASE-21251
> URL: https://issues.apache.org/jira/browse/HBASE-21251
> Project: HBase
> Issue Type: Improvement
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Priority: Major
> Fix For: 3.0.0, 2.2.0, 2.1.1
>
> Attachments: HBASE-21251.master.001.patch,
> HBASE-21251.master.002.patch, HBASE-21251.master.003.patch,
> HBASE-21251.master.004.patch
>
>
> 1. Move connection and admin to RegionMover's member variables. No need
> create connection many times.
> 2. use try-with-resource to reduce code
> 3. use ServerName instead of String
> 4. don't use Deprecated method
> 5. remove duplicate code
> ......
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