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https://issues.apache.org/jira/browse/CASSANDRA-8959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17600853#comment-17600853
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Avi Kivity commented on CASSANDRA-8959:
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If you're changing the representation in the native protocol, please make it
negotiated, so an old driver can continue talking to a new node, and so that
new and old nodes can coexist.
> More efficient frozen UDT, tuple and collection serialization format
> --------------------------------------------------------------------
>
> Key: CASSANDRA-8959
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8959
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Core
> Reporter: Aleksey Yeschenko
> Priority: Normal
> Labels: performance
> Fix For: 4.x
>
>
> The current serialization format for UDTs has a fixed overhead of 4 bytes per
> defined field (encoding the size of the field).
> It is inefficient for sparse UDTs - ones with many defined fields, but few of
> them present. We could keep a bitset to indicate the missing fields, if any.
> It's sub-optimal for encoding UDTs with all the values present as well. We
> could use varint encoding for the field sizes of blob/text fields and encode
> 'fixed' sized types directly, without the 4-bytes size prologue.
> That or something more brilliant. Any improvement right now is lhf.
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