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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8653) master seems to be deleting region tmp directory from under compaction
Date Thu, 30 May 2013 03:17:19 GMT
Sergey Shelukhin created HBASE-8653:
---------------------------------------

             Summary: master seems to be deleting region tmp directory from under compaction
                 Key: HBASE-8653
                 URL: https://issues.apache.org/jira/browse/HBASE-8653
             Project: HBase
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin
            Priority: Blocker
             Fix For: 0.95.1


Putting it in .1, feel free to move to .2.
We have observed some compaction errors where creating HDFS block, and the file would not
exist. Upon investigation, we found the .tmp directory delete request on namenode from master
IP. There are no specific logs on master, but one thing running at that time was CatalogJanitor.
CatalogJanitor calls HRegionFileSystem::openRegionFromFileSystem with readOnly == true (in
fact, everyone does); if readOnly is true, HRegionFileSystem nukes the .tmp directory.
We didn't go thru details on how it arrived there (or if there may have been other culprit),
but it appears that deleting stuff if (readOnly) is not the intended behavior and it should
be if (!readOnly). Given that readOnly is not really used (or rather is always true except
some inconsequential usage in test) perhaps entire cleanup should be removed.

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