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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2010/06/02 02:07:36 UTC

[jira] Commented: (HBASE-2405) Close, split, open of regions in RegionServer are run by a single thread only.

    [ https://issues.apache.org/jira/browse/HBASE-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874325#action_12874325 ] 

stack commented on HBASE-2405:
------------------------------

Just to say I ran into a recent issue where a region that was taking a very long time to open -- bug -- blocked the opening of all those behind it.

> 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: 0.21.0
>
>         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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