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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8653) master seems to be deleting region tmp directory from under compaction
Date Thu, 30 May 2013 13:52:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-8653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-8653:
--------------------------

    Attachment: 8653-v2.txt
    
> 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
>
>         Attachments: 8653-v2.txt, HBASE-8653-v0.patch
>
>
> Putting it in .1, feel free to move to .2.
> We have observed some compaction errors where the code was creating a new HDFS block,
and the file would not exist. Upon investigation, we found the .tmp directory delete request
on namenode from master IP shortly before that. 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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