[CASSANDRA-2610] Have the repair of a range repair *all* the replica for that range

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Assignee: Sylvain Lebresne
• Reporter: Sylvain Lebresne

Authors

Sylvain Lebresne

Reviewers

Jonathan Ellis

• Created: 05/May/11 11:06
• Updated: 16/Apr/19 09:33
• Resolved: 02/Sep/11 10:25

Description

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.

Issue Links

• blocks: CASSANDRA-2405 should expose 'time since last successful repair' for easier aes monitoring
• depends upon: CASSANDRA-2433 Failed Streams Break Repair
• is depended upon by: CASSANDRA-2606 Expose through JMX the ability to repair only the primary range