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Date: Fri, 13 May 2011 17:39:47 +0000 (UTC)
From: "T Jake Luciani (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-2034) Make Read Repair unnecessary
 when Hinted Handoff is enabled
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    [ https://issues.apache.org/jira/browse/CASSANDRA-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033147#comment-13033147 ] 

T Jake Luciani commented on CASSANDRA-2034:
-------------------------------------------

Don't hints timeout?  would there be a chance of never resolving the discrepancy with this approach?

> 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: Jonathan Ellis
>             Fix For: 1.0
>
>   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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