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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4415) Add cursor API/auto paging to the native CQL protocol
Date Mon, 24 Jun 2013 14:02:23 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691987#comment-13691987
] 

Sylvain Lebresne commented on CASSANDRA-4415:
---------------------------------------------

Thanks for the review.

I've pushed a additional patch on the same (force-rebased) branch to fix those issues. I realized
that the QueryPagers.pagedQuery() method wasn't really cutting it since it was "losing" the
CF-level deletion information, so I've replaced it with a simpler countPaged() method. The
code was also slightly under-counting the number of remaining results so that's fixed too.

All tests seem to be working fine here now.

                
> Add cursor API/auto paging to the native CQL protocol
> -----------------------------------------------------
>
>                 Key: CASSANDRA-4415
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4415
>             Project: Cassandra
>          Issue Type: New Feature
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>              Labels: cql, protocol
>             Fix For: 2.0 beta 1
>
>
> The goal here would be to use a query paging mechanism to the CQL native protocol. Typically
the client/server with that would look something like this:
> {noformat}
> C sends query to S.
> S sends N first rows matching the query + flag saying the response is not complete
> C requests the next N rows
> S sends N next rows + flag saying whether there is more
> C requests the next N rows
> ...
> S sends last rows + flag saying there is no more result
> {noformat}
> The clear goal is for user to not have to worry about limiting queries and doing manual
paging.

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