Matteo Bertozzi created HBASE-13651:
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Summary: Handle StoreFileScanner FileNotFoundException
Key: HBASE-13651
URL: https://issues.apache.org/jira/browse/HBASE-13651
Project: HBase
Issue Type: Bug
Affects Versions: 0.98.10.1, 0.94.27
Reporter: Matteo Bertozzi
Assignee: Matteo Bertozzi
Priority: Minor
Attachments: HBASE-13651-draft.patch
Example:
* Machine-1 is serving Region-X and start compaction
* Machine-1 goes in GC pause
* Region-X gets reassigned to Machine-2
* Machine-2 exit from the GC pause
* Machine-2 (re)moves the compacted files
* Machine-2 get the lease and shutdown
Machine-2 has now tons of FileNotFoundException on scan. If we reassign the
region everything is ok, because we pickup the files compacted by Machine-1.
This problem doesn't happen in the new code 1.0+ (i think but I haven't
checked, it may be 1.1) where we write on the WAL the compaction event before
(re)moving the files.
A workaround is handling FileNotFoundException and refresh the store files, or
shutdown the region and reassign. the first one is easy in 1.0+ the second one
requires more work because at the moment we don't have the code to notify the
master that the RS is closing the region, alternatively we can shutdown the
entire RS (it is not a good solution but the case is rare enough)
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