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https://issues.apache.org/jira/browse/HBASE-8803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704504#comment-13704504
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Jean-Marc Spaggiari commented on HBASE-8803:
--------------------------------------------
Hi Nick, I will for sure give it a try! Most probably this evening. So you can
expect a feedback tomorrow morning. For the recommendations, I think the
default value is a good start. You can go higher if you node is able to handle
it. I tried with 20 and 30 and it worked, but it was not twice or 3 times
faster than 10. Only got an extra +20%. Also, it will depend on the region
size. For small regions, more threads will be better. For big regions, you will
be limited by the network anyway....
> region_mover.rb should move multiple regions at a time
> ------------------------------------------------------
>
> Key: HBASE-8803
> URL: https://issues.apache.org/jira/browse/HBASE-8803
> Project: HBase
> Issue Type: Bug
> Components: Usability
> Affects Versions: 0.98.0, 0.94.8, 0.95.1
> Reporter: Jean-Marc Spaggiari
> Assignee: Jean-Marc Spaggiari
> Fix For: 0.98.0, 0.95.2, 0.94.10
>
> Attachments: HBASE-8803-v0-trunk.patch, HBASE-8803-v1-0.94.patch,
> HBASE-8803-v1-trunk.patch, HBASE-8803-v2-0.94.patch
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> When there is many regions in a cluster, rolling_restart can take hours
> because region_mover is moving the regions one by one.
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