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https://issues.apache.org/jira/browse/CASSANDRA-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085142#comment-13085142
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Patricio Echague commented on CASSANDRA-2034:
---------------------------------------------
I can do that.
Also, I'm not quite happy with waiting for local hints to complete per
mutation. I'm thinking of adding them to the handler so that we can wait for
the hints after scheduling all the mutations.
It has pros and cons:
Pros: If the coordinator node is overwhelmed, we can tell the client right away.
Cons: Por large mutations, we are actually blocking for local hints (if any)
per mutation which is not ideal.
> Make Read Repair unnecessary when Hinted Handoff is enabled
> -----------------------------------------------------------
>
> Key: CASSANDRA-2034
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2034
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Patricio Echague
> Fix For: 1.0
>
> Attachments: 2034-formatting.txt, CASSANDRA-2034-trunk-v10.patch,
> CASSANDRA-2034-trunk-v11.patch, CASSANDRA-2034-trunk-v11.patch,
> CASSANDRA-2034-trunk-v12.patch, CASSANDRA-2034-trunk-v13.patch,
> CASSANDRA-2034-trunk-v2.patch, CASSANDRA-2034-trunk-v3.patch,
> CASSANDRA-2034-trunk-v4.patch, CASSANDRA-2034-trunk-v5.patch,
> CASSANDRA-2034-trunk-v6.patch, CASSANDRA-2034-trunk-v7.patch,
> CASSANDRA-2034-trunk-v8.patch, CASSANDRA-2034-trunk-v9.patch,
> CASSANDRA-2034-trunk.patch
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> 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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