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From "Rick Branson (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-5966) Average name query performance much worse for wide rows
Date Sun, 01 Sep 2013 00:17:51 GMT


Rick Branson updated CASSANDRA-5966:

    Attachment: 5966.txt

Attached patch modifies SSTableNamesIterator to stop deserializing columns from the SSTable
as soon as it's reached the maximal column name for a given query or indexed range. This is
for both the narrow and wide row case.
> Average name query performance much worse for wide rows
> -------------------------------------------------------
>                 Key: CASSANDRA-5966
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Rick Branson
>            Assignee: Rick Branson
>         Attachments: 5966.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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