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From "Dimitri Goldin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8502) Stuck Region after failed split
Date Tue, 07 May 2013 15:53:15 GMT
Dimitri Goldin created HBASE-8502:
-------------------------------------

             Summary: Stuck Region after failed split
                 Key: HBASE-8502
                 URL: https://issues.apache.org/jira/browse/HBASE-8502
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.1
            Reporter: Dimitri Goldin
            Priority: Critical
         Attachments: stuck_region_exception.txt

Exact HBase version: 0.92.1-cdh4.1.2

A couple of days ago I encountered a RIT problem with a single region.
After an hbck run it started trying to assign a region which has been 
bouncing between OFFLINE/PENDING_OPEN/OPENING for two days afterwards.

This was due to a split gone wrong in some way, which led to several 
reference files being left in the region-directory despite the two relevant HFiles being copies
successfully to the daughter.

I will try to give as many details as possible, but unfortunately I was
unable to find any information about the split itself.

Short thread about this issue on the users-ML: http://mail-archives.apache.org/mod_mbox/hbase-user/201305.mbox/%3C5182758B.1060306@neofonie.de%3E

===

Parent region: 5b9c16898a371de58f31f0bdf86b1f8b
Daughter region in question: 79c619508659018ff3ef0887611eb8f7

Rough sequence from the logs seems to be the following:

===
* Received request to open region:
documents,7128586022887322720,1363696791400.79c619508659018ff3ef0887611eb8f7.

* Setting up tabledescriptor config now ...

* Opening of region {NAME =>
'documents,7128586022887322720,1363696791400.79c619508659018ff3ef0887611eb8f7.',
     STARTKEY => '7128586022887322720',
     ENDKEY => '7130716361635801616',
     ENCODED => 79c619508659018ff3ef0887611eb8f7,} failed, marking as 
FAILED_OPEN in ZK

* File does not exist: 
/hbase/documents/5b9c16898a371de58f31f0bdf86b1f8b/d/0707b1ec4c6b41cf9174e0d2a1785fe9 
[...]
===

What happened, was that somehow (and that's the question here) the daughters
region folder contained some left-over reference files were causing the 
RegionServer to look-up the parent region, which already was deleted.

original contents of /hbase/documents/79c619508659018ff3ef0887611eb8f7/d:
==
0707b1ec4c6b41cf9174e0d2a1785fe9.5b9c16898a371de58f31f0bdf86b1f8b
47511faae81b4452afd3ca206e28346f.5b9c16898a371de58f31f0bdf86b1f8b
4f01ecd052ce464d81e79a62ea227d6b
4f01ecd052ce464d81e79a62ea227d6b.5b9c16898a371de58f31f0bdf86b1f8b
eb7dbb09701d4353be24ca82481c4a7e
== 

I attached the full FileNotFound Exception.

Please let me know if I can provide more information or help otherwise.

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