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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4015) Refactor the TimeoutMonitor to make it less racy
Date Fri, 19 Aug 2011 15:23:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ramkrishna.s.vasudevan updated HBASE-4015:
------------------------------------------

    Attachment: HBASE-4015_2_trunk.patch

> 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: HBASE-4015_1_trunk.patch, HBASE-4015_2_trunk.patch, 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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