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Dikang Gu commented on CASSANDRA-12814:
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FYI, I start to work on this and test in our internal env. In high level, my
current approach is to introduce a MultiReadCommand, so that StorageProxy will
group individual read commands belong to the same physical data node together,
into one MultiReadCommand and send to the data node.
> 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
> Components: Coordination
> Reporter: Dikang Gu
> Assignee: 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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