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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9894) Serialize the header only once per message
Date Thu, 30 Jul 2015 21:36:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14648349#comment-14648349
] 

Benedict commented on CASSANDRA-9894:
-------------------------------------

bq. I thought the reason you did it was to have the most compact encoding for the positive
numbers which are going to be more common.

I think those two statements add up to the same thing :)

I'll add a comment explaining the full thought process, as it's actually a little more subtle
to that. The encoding is designed to tend towards a single byte in the most common cases,
and most importantly that it was consistent with a guaranteed single byte in the most common
case (equality).

> Serialize the header only once per message
> ------------------------------------------
>
>                 Key: CASSANDRA-9894
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9894
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Benedict
>             Fix For: 3.0 beta 1
>
>
> One last improvement I'd like to do on the serialization side is that we currently serialize
the {{SerializationHeader}} for each partition. That header contains the serialized columns
in particular and for range queries, serializing that for every partition is wasted (note
that it's only a problem for the messaging protocol as for sstable we only write the header
once per sstable).



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