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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/03/14 23:06:12 UTC

[jira] [Created] (CASSANDRA-5351) Avoid repairing already-repaired data by default

Jonathan Ellis created CASSANDRA-5351:
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             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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