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https://issues.apache.org/jira/browse/HBASE-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902258#action_12902258
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Jonathan Gray commented on HBASE-2405:
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this is for free with the new master, already implemented in the branch.
opens/closes are multi-threaded.
> Close, split, open of regions in RegionServer are run by a single thread only.
> ------------------------------------------------------------------------------
>
> Key: HBASE-2405
> URL: https://issues.apache.org/jira/browse/HBASE-2405
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: nsre.txt
>
>
> JGray and Karthik observed yesterday that a regoin open message arrived at
> the regionserver but that the regionserver worker thread did not get around
> to the actually opening until 45 seconds later (region offline for 45
> seconds). We only run a single Worker thread in a regoinserver processing
> open, close, and splits. In this case, a long running close (or two) held up
> the worker thread. We need to run more than a single worker. A pool of
> workers? Should opens be prioritized?
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