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From "Dikang Gu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-12814) Batch read requests to same physical host
Date Wed, 19 Oct 2016 22:27:58 GMT
Dikang Gu created CASSANDRA-12814:
-------------------------------------

             Summary: 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


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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