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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3159) Double play of OpenedRegionHandler for a single region; fails second time through and aborts Master
Date Thu, 28 Oct 2010 21:33:26 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray updated HBASE-3159:
---------------------------------

    Attachment: HBASE-3159-FINAL.patch

Patch committed.

> Double play of OpenedRegionHandler for a single region; fails second time through and
aborts Master
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3159
>                 URL: https://issues.apache.org/jira/browse/HBASE-3159
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Blocker
>             Fix For: 0.90.0
>
>         Attachments: HBASE-3159-FINAL.patch, hbase-meta-dupe-opened-master-only.txt,
hbase-meta-dupe-opened.txt, master-root-assign-abort.log, rs_death_on_meta_open_no_root.txt,
TestRollingRestart-v4.patch
>
>
> Here is master log with annotations: http://people.apache.org/~stack/master.txt
> Region in question is:
> b8827a67a9d446f345095d25e1f375f7
> The running code is doctored in that I've added in a bit of logging -- zk in particular
-- and I've also removed what I thought was a provocation of this condition, reassign inside
in an assign if server has gone away when we try the open rpc (Turns out we have the condition
even w/o this code in place).
> The log starts where the region in question timesout in RIT.
> We assign it to 186.
> Notice how we see 'Handling transition' for this region TWICE.  This means two OpenedRegionHandlers
will be scheduled -- and so the failure to delete a znode already gone.
> As best I can tell, the watcher for this region is triggered once only -- which is odd
because how then the double scheduling of OpenedRegionHandler but also, why am I not seeing
OPENING, OPENING, OPENED and only what I presume is an OPENED?

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