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From "Ben Lau (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17720) Possible bug in FlushSnapshotSubprocedure
Date Thu, 02 Mar 2017 19:04:45 GMT
Ben Lau created HBASE-17720:
-------------------------------

             Summary: Possible bug in FlushSnapshotSubprocedure
                 Key: HBASE-17720
                 URL: https://issues.apache.org/jira/browse/HBASE-17720
             Project: HBase
          Issue Type: Bug
          Components: dataloss, snapshots
            Reporter: Ben Lau


I noticed that FlushSnapshotSubProcedure differs from MemstoreFlusher in that it does not
appear to explicitly handle a DroppedSnapshotException.  In the primary codepath when flushing
memstores, (see MemStoreFlusher.flushRegion()), there is a try/catch for DroppedSnapshotException
that will abort the regionserver to replay WALs to avoid data loss.  I don't see this in FlushSnapshotSubProcedure.
 Is this an accidental omission or is there a reason this isn't present?  

I'm not too familiar with procedure V1 or V2.  I assume it is the case that if a participant
dies that all other participants will terminate any outstanding operations for the procedure?
 If so and if this lack of RS.abort() for DroppedSnapshotException is a bug, then it can't
be fixed naively otherwise I assume a failed flush on 1 region server could cause a cascade
of RS abortions on the cluster.



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