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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/18 18:04:02 UTC
[jira] [Updated] (CASSANDRA-10309) Avoid always looking up column
type
[ https://issues.apache.org/jira/browse/CASSANDRA-10309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
C. Scott Andreas updated CASSANDRA-10309:
-----------------------------------------
Component/s: Local Write-Read Paths
> Avoid always looking up column type
> -----------------------------------
>
> Key: CASSANDRA-10309
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10309
> Project: Cassandra
> Issue Type: Improvement
> Components: Local Write-Read Paths
> Reporter: T Jake Luciani
> Assignee: Carl Yeksigian
> Priority: Minor
> Labels: perfomance
> Fix For: 4.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.
> https://github.com/tjake/cassandra/commit/69b94c389b3f36aa035ac4619fd22d1f62ea80b2
> 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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