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


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

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:
>             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
> 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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