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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11175) Extend support for post-reconcilliation processing to all read commands
Date Wed, 17 Feb 2016 11:58:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150393#comment-15150393
] 

Sam Tunnicliffe commented on CASSANDRA-11175:
---------------------------------------------

Well, one thing at a time. The intent of this ticket is to put the hooks in place to support
the behaviour programatically, adding support at the syntax level would be something to think
about later IMO.

> Extend support for post-reconcilliation processing to all read commands
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-11175
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11175
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Minor
>             Fix For: 3.x
>
>
> CASSANDRA-8717 introduced limited support for processing or transformation of query results
on the coordinator, which occurs after the results from individual replicas have been reconciled.
At the moment this is limited to queries which utilise secondary indexes and the post-processing
function itself is provided by the index implementation. It would be useful if this were expanded
so that any read command may include a post-reconcilliation processing step. A straightforward
way to control this would be via a custom {{QueryHandler}}. 



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