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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5351) Avoid repairing already-repaired data by default
Date Thu, 14 Mar 2013 22:06:12 GMT
Jonathan Ellis created CASSANDRA-5351:
-----------------------------------------

             Summary: Avoid repairing already-repaired data by default
                 Key: CASSANDRA-5351
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5351
             Project: Cassandra
          Issue Type: Task
          Components: Core
            Reporter: Jonathan Ellis
             Fix For: 2.0


Repair has always built its merkle tree from all the data in a columnfamily, which is guaranteed
to work but is inefficient.

We can improve this by remembering which sstables have already been successfully repaired,
and only repairing sstables new since the last repair.

The tricky part is, compaction will (if not taught otherwise) mix repaired data together with
non-repaired.  So we should segregate unrepaired sstables from the repaired ones.

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