Make Read Repair unnecessary when Hinted Handoff is enabled
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Key: CASSANDRA-2034
URL: https://issues.apache.org/jira/browse/CASSANDRA-2034
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Fix For: 0.7.1
Currently, HH is purely an optimization -- if a machine goes down, enabling HH
means RR/AES will have less work to do, but you can't disable RR entirely in
most situations since HH doesn't kick in until the FailureDetector does.
Let's add a scheduled task to the mutate path, such that we return to the
client normally after ConsistencyLevel is achieved, but after RpcTimeout we
check the responseHandler write acks and write local hints for any missing
targets.
This would making disabling RR when HH is enabled a much more reasonable
option, which has a huge impact on read throughput.
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