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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2405) Close, split, open of regions in RegionServer are run by a single thread only.
Date Wed, 25 Aug 2010 00:10:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902184#action_12902184
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Jean-Daniel Cryans commented on HBASE-2405:
-------------------------------------------

Jon, do you still want to do this as part of HBASE-2485 in the scope of 0.90? IMO we already
have enough.

> 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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