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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2405) Close, split, open of regions in RegionServer are run by a single thread only.
Date Tue, 06 Apr 2010 00:36:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853618#action_12853618
] 

Jonathan Gray commented on HBASE-2405:
--------------------------------------

Do we need to shuffle open/close compactions and flushes via a shared thread pool w/ current
compactions and flushes?  This kind of thing needs to be configurable and strictly enforced
imo

> 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: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.20.4, 0.21.0
>
>         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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