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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-8959) More efficient frozen UDT, tuple and collection serialization format
Date Fri, 23 Oct 2015 13:31:27 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-8959:
----------------------------------------
    Summary: More efficient frozen UDT, tuple and collection serialization format  (was: More
efficient frozen UDT and tuple serialization format)

> 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
>            Reporter: Aleksey Yeschenko
>              Labels: performance
>             Fix For: 3.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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