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From "Chris Lohfink (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14311) Allow Token-Aware drivers for range scans
Date Thu, 15 Mar 2018 15:44:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400588#comment-16400588
] 

Chris Lohfink commented on CASSANDRA-14311:
-------------------------------------------

> You could do this right now if you just add a new higher level querying interface in
a given driver.

That was my first reaction, adding some kinda table scan/bulk reader methods to the driver
maybe worth a shot instead of being replicated in hadoop, spark and misc tools that do table
scans.

> 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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