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From "Ravi Prasad (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5966) Average name query performance much worse for wide rows
Date Thu, 05 Sep 2013 22:11:53 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759531#comment-13759531
] 

Ravi Prasad commented on CASSANDRA-5966:
----------------------------------------

This seems to be breaking HintedHandOffManager scheduled task, which does a empty names column
filter: https://issues.apache.org/jira/browse/CASSANDRA-5979
                
> Average name query performance much worse for wide rows
> -------------------------------------------------------
>
>                 Key: CASSANDRA-5966
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5966
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Rick Branson
>            Assignee: Rick Branson
>             Fix For: 1.2.10, 2.0.1
>
>         Attachments: 5966-trunk.txt, 5966.txt, 5966-v2.txt
>
>
> The average performance for by-name queries degrades heavily on wide rows. This is because
in the wide row case SSTableNamesIterator deserializes every column in the entire row chunk
(64KB by default), where-as in the narrow row case, it stops deserializing as soon as it's
found the columns it's looking for.

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