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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/18 18:17:01 UTC
[jira] [Updated] (CASSANDRA-8959) More efficient frozen UDT, tuple
and collection serialization format
[ https://issues.apache.org/jira/browse/CASSANDRA-8959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
C. Scott Andreas updated CASSANDRA-8959:
----------------------------------------
Component/s: Core
> 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: Core
> Reporter: Aleksey Yeschenko
> Priority: Major
> 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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