Sergey Shelukhin created HBASE-8653:
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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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