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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2038) Add local read path back to StorageProxy
Date Mon, 24 Jan 2011 06:46:43 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2038:
--------------------------------------

    Attachment: 2038-v2.txt

v2 generalizes to allow optimizing local reads for any CL and for digest as well as data reads,
without having to special-case LocalFutures.  it also simplifies the message-sending to a
single pass instead of message array construction followed by re-iteration over them.

v2 is completely un-tested but the approach is promising. :)

> Add local read path back to StorageProxy
> ----------------------------------------
>
>                 Key: CASSANDRA-2038
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2038
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.1
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>             Fix For: 0.7.1
>
>         Attachments: 0001-CASSANDRA-2038-reincorporate-local-reads.txt, 0002-CASSANDRA-2038-only-local-for-CL.ONE.txt,
2038-v2.txt
>
>
> CASSANDRA-982 removed the local read path optimization.  Without this all local reads
go through serialization and messaging.  Avoiding this step improves local read performance
> 50%
>  

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