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