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Posted to commits@cassandra.apache.org by "Aleksey Yeschenko (JIRA)" <ji...@apache.org> on 2015/03/12 06:39:38 UTC

[jira] [Created] (CASSANDRA-8959) More efficient frozen UDT and tuple serialization format

Aleksey Yeschenko created CASSANDRA-8959:
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             Summary: More efficient frozen UDT and tuple serialization format
                 Key: CASSANDRA-8959
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8959
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Aleksey Yeschenko
             Fix For: 3.1


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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