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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13651) Handle StoreFileScanner FileNotFoundException
Date Fri, 08 May 2015 22:35:59 GMT
Matteo Bertozzi created HBASE-13651:
---------------------------------------

             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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