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https://issues.apache.org/jira/browse/HBASE-3610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003822#comment-13003822
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stack commented on HBASE-3610:
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+1 assuming you've tested it Nicolas.
> Improve RegionSplitter Performance
> ----------------------------------
>
> Key: HBASE-3610
> URL: https://issues.apache.org/jira/browse/HBASE-3610
> Project: HBase
> Issue Type: Improvement
> Reporter: Nicolas Spiegelberg
> Assignee: Nicolas Spiegelberg
> Priority: Trivial
> Attachments: 0001-HBASE-3610-Improve-RegionSplitter-performance.patch
>
>
> When running RegionSplitter on a 100-node cluster with 900 regions (and
> plenty of data), the utility took around 72 hours to run. Analysis revealed
> two major bottlenecks:
> 1. We are serialized on the logical split (i.e. waiting for the split request
> to be registered). Parallelizing this step will align configured and actual
> outstanding splits.
> 2. Outstanding splits are modeled like a queue. Changing this to a list with
> a scanner will allow handling splits that finish out of order.
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