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Date: Sat, 6 Aug 2011 14:07:27 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4015) Refactor the TimeoutMonitor to make
 it less racy
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    [ https://issues.apache.org/jira/browse/HBASE-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13080407#comment-13080407 ] 

Ted Yu commented on HBASE-4015:
-------------------------------

The verification of state is what I was thinking.
Good job Ramkrishna.

> Refactor the TimeoutMonitor to make it less racy
> ------------------------------------------------
>
>                 Key: HBASE-4015
>                 URL: https://issues.apache.org/jira/browse/HBASE-4015
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.90.3
>            Reporter: Jean-Daniel Cryans
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 0.92.0
>
>         Attachments: Timeoutmonitor with state diagrams.pdf
>
>
> The current implementation of the TimeoutMonitor acts like a race condition generator, mostly making things worse rather than better. It does it's own thing for a while without caring for what's happening in the rest of the master.
> The first thing that needs to happen is that the regions should not be processed in one big batch, because that sometimes can take minutes to process (meanwhile a region that timed out opening might have opened, then what happens is it will be reassigned by the TimeoutMonitor generating the never ending PENDING_OPEN situation).
> Those operations should also be done more atomically, although I'm not sure how to do it in a scalable way in this case.

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