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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-930) make RR chance configurable
Date Tue, 30 Mar 2010 02:43:27 GMT
make RR chance configurable
---------------------------

                 Key: CASSANDRA-930
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-930
             Project: Cassandra
          Issue Type: Wish
          Components: Core
            Reporter: Jonathan Ellis
            Priority: Minor
             Fix For: 0.8


Read load increases linearly with replication factor.  While this can be mitigated by simply
adding machines, it would also be nice to be able to configure on a per-CF basis the chance
of performing a read repair, so that particularly heavily read CFs could have a chance of
(say) 10% and seldom-used ones could continue to repair every time, i.e., chance of 100%.
 Thus, the "hot keys get repaired before waiting for anti-entropy to kick in" property gets
preserved, but you might see a few more reads serving old values than before.

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