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From "Carl Yeksigian (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10309) Avoid always looking up column type
Date Tue, 11 Oct 2016 17:12:20 GMT


Carl Yeksigian commented on CASSANDRA-10309:

CASSANDRA-12443 removes the need to reload the sstables after they have been loaded - since
there is no way for the types to change after the sstable has been loaded, we don't need to
have a way to refresh the metadata which simplifies this ticket.4

> Avoid always looking up column type
> -----------------------------------
>                 Key: CASSANDRA-10309
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: T Jake Luciani
>            Assignee: Carl Yeksigian
>            Priority: Minor
>              Labels: perfomance
>             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.
> 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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