Have the repair of a range repair *all* the replica for that range
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Key: CASSANDRA-2610
URL: https://issues.apache.org/jira/browse/CASSANDRA-2610
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 0.8 beta 1
Reporter: Sylvain Lebresne
Assignee: Sylvain Lebresne
Priority: Minor
Fix For: 0.8.1
Say you have a range R whose replica for that range are A, B and C. If you run
repair on node A for that range R, when the repair end you only know that A is
fully repaired. B and C are not. That is B and C are up to date with A before
the repair, but are not up to date with one another.
It makes it a pain to schedule "optimal" cluster repairs, that is repairing a
full cluster without doing work twice (because you would have still have to run
a repair on B or C, which will make A, B and C redo a validation compaction on
R, and with more replica it's even more annoying).
However it is fairly easy during the first repair on A to have him compare all
the merkle trees, i.e the ones for B and C, and ask to B or C to stream between
them whichever the differences they have.
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