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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-982) read repair on quorum consistencylevel
Date Wed, 29 Dec 2010 05:53:47 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-982:
-------------------------------------

    Attachment: 0003-rename-QuorumResponseHandler-ReadCallback.txt
                0002-implement-read-repair-as-a-second-resolve-after-the-in.txt
                0001-r-m-SP.weakRead-rename-strongRead-to-fetchRows.-read-r.txt

> read repair on quorum consistencylevel
> --------------------------------------
>
>                 Key: CASSANDRA-982
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-982
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.7.1
>
>         Attachments: 0001-better-digest-checking-for-ReadResponseResolver.patch, 0001-r-m-SP.weakRead-rename-strongRead-to-fetchRows.-read-r.txt,
0002-implement-read-repair-as-a-second-resolve-after-the-in.txt, 0002-quorum-only-read.txt,
0003-rename-QuorumResponseHandler-ReadCallback.txt, 982-resolve-digests-v2.txt
>
>   Original Estimate: 6h
>  Remaining Estimate: 6h
>
> CASSANDRA-930 made read repair "fuzzy optional," but this only helps with ConsistencyLevel.ONE:
> - Quorum reads always send requests to all nodes
> - only the first Quorum's worth of responses get compared
> So what we'd like to do two changes:
> - only send read requests to the closest R live nodes
> - if read repair is enabled, also compare results from the other nodes in the background

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