make RR chance configurable
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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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