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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2015/09/11 23:34:45 UTC

[jira] [Commented] (CASSANDRA-10309) Avoid always looking up column type

    [ https://issues.apache.org/jira/browse/CASSANDRA-10309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741572#comment-14741572 ] 

T Jake Luciani commented on CASSANDRA-10309:
--------------------------------------------

/cc [~slebresne]

> Avoid always looking up column type
> -----------------------------------
>
>                 Key: CASSANDRA-10309
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10309
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: T Jake Luciani
>            Priority: Minor
>             Fix For: 3.x
>
>
> Doing some read profiling I noticed we always seem to look up the type of a column from the schema metadata when we have the type already in the column class.
> This one simple change to SerializationHeader improves read performance non-trivially.
> http://cstar.datastax.com/graph?stats=3fb1ced4-58c7-11e5-9faf-42010af0688f&metric=op_rate&operation=2_read&smoothing=1&show_aggregates=true&xmin=0&xmax=357.94&ymin=0&ymax=157416.6
> I assume we are looking this up to deal with schema changes. But I'm sure there is a more performant way of doing this.



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