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https://issues.apache.org/jira/browse/CASSANDRA-10309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741572#comment-14741572
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T Jake Luciani commented on CASSANDRA-10309:
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/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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