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From "Philip Thompson (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-10786) Include hash of result set metadata in prepared statement id
Date Tue, 01 Dec 2015 19:51:11 GMT


Philip Thompson updated CASSANDRA-10786:
    Component/s: CQL

> Include hash of result set metadata in prepared statement id
> ------------------------------------------------------------
>                 Key: CASSANDRA-10786
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Olivier Michallat
>            Priority: Minor
>             Fix For: 3.2
> This is a follow-up to CASSANDRA-7910, which was about invalidating a prepared statement
when the table is altered, to force clients to update their local copy of the metadata.
> There's still an issue if multiple clients are connected to the same host. The first
client to execute the query after the cache was invalidated will receive an UNPREPARED response,
re-prepare, and update its local metadata. But other clients might miss it entirely (the MD5
hasn't changed), and they will keep using their old metadata.
> One solution that was suggested is to include a hash of the result set metadata in the
prepared statement id. The old id would become invalid, forcing all clients to reprepare.

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