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From "Avi Kivity (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14311) Allow Token-Aware drivers for range scans
Date Thu, 15 Mar 2018 15:51:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400592#comment-16400592
] 

Avi Kivity commented on CASSANDRA-14311:
----------------------------------------

{quote}this allows querying multiple token ranges in parallel and gives even more benefits
than just node hopping for the “next” page
{quote}
 

That changes the query semantics, not all users are prepared for parallel scan in a single
thread. For sure, it is viable.

 

My proposal optimizes existing use case where you have a sequential query and want to keep
it sequential.

> Allow Token-Aware drivers for range scans
> -----------------------------------------
>
>                 Key: CASSANDRA-14311
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14311
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Coordination
>            Reporter: Avi Kivity
>            Priority: Major
>
> Currently, range scans are not token aware. This means that an extra hop is needed for
most requests. Since range scans are usually data intensive, this causes significant extra
traffic.
>  
> Token awareness could be enabled by having the coordinator return the token for the next
(still unread) row in the response, so the driver can select a next coordinator that owns
this row.



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