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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14949) Skip duplicate entries when replay WAL.
Date Tue, 08 Dec 2015 08:38:10 GMT
Heng Chen created HBASE-14949:
---------------------------------

             Summary: Skip duplicate entries when replay WAL.
                 Key: HBASE-14949
                 URL: https://issues.apache.org/jira/browse/HBASE-14949
             Project: HBase
          Issue Type: Improvement
            Reporter: Heng Chen


As HBASE-14004 design,  there will be duplicate entries in different WAL.  It happens when
one hflush failed, we will close old WAL with 'acked hflushed' length,  then open a new WAL
and write the unacked hlushed entries into it.
So there maybe some overlap between old WAL and new WAL.

We should skip the duplicate entries when replay.  I think it has no harm to current logic,
maybe we do it first. 



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