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From Michaël Figuière (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4693) CQL Protocol should allow multiple PreparedStatements to be atomically executed
Date Thu, 20 Dec 2012 13:55:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537022#comment-13537022
] 

Michaël Figuière commented on CASSANDRA-4693:
---------------------------------------------

Considering the key role of Batches in CQL3, it would actually be very interesting to allow
clients to send a list of both prepared and un-prepared statements to be executed with the
same semantic and guarantees of a BATCH command. This would allow applications developers
/ frameworks to prepare most of their queries and include an additional one that is generated
at runtime. An example of a use case that would leverage such is feature is when a bunch of
columns need to be saved along with a set of complex collection mutations.
                
> CQL Protocol should allow multiple PreparedStatements to be atomically executed
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4693
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4693
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Michaël Figuière
>              Labels: cql, protocol
>
> Currently the only way to insert multiple records on the same partition key, atomically
and using PreparedStatements is to use a CQL BATCH command. Unfortunately when doing so the
amount of records to be inserted must be known prior to prepare the statement which is rarely
the case. Thus the only workaround if one want to keep atomicity is currently to use unprepared
statements which send a bulk of CQL strings and is fairly inefficient.
> Therefore CQL Protocol should allow clients to send multiple PreparedStatements to be
executed with similar guarantees and semantic as CQL BATCH command.

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