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From "Dikang Gu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12814) Batch read requests to same physical host
Date Fri, 11 Nov 2016 00:28:58 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dikang Gu updated CASSANDRA-12814:
----------------------------------
    Labels: performance  (was: )

> Batch read requests to same physical host
> -----------------------------------------
>
>                 Key: CASSANDRA-12814
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12814
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Dikang Gu
>              Labels: performance
>
> We have couple use cases that are doing fanout read for their data, means one single
read request from client contains multiple keys which live on different physical hosts. (I
know it's not recommended way to access C*).
> Right now, on the coordinator, it will issue separate read commands even though they
will go to the same physical host, which I think is causing a lot of overheads.
> I think it's valuable to provide a new read command, that coordinator can batch the reads
to one datanode, and send to it in one message, and datanode will return the results for all
keys belong to it.



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