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https://issues.apache.org/jira/browse/CASSANDRA-15910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caleb Rackliffe updated CASSANDRA-15910:
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Labels: query read (was: )
> Add multi-partition key commands
> --------------------------------
>
> Key: CASSANDRA-15910
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15910
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Andres de la Peña
> Priority: Normal
> Labels: query, read
>
> As it's mentioned in [this TODO
> comment|https://github.com/apache/cassandra/blob/dd255ffa07d0263521a1ca863fc2192db19bc04c/src/java/org/apache/cassandra/service/ReplicaFilteringProtection.java#L141]
> that was introduced in CASSANDRA-8272, replica filtering protection would
> benefit from a {{ReadCommand}} implementation able to internally read the
> rows identified by a group of primary keys residing in different partitions.
> It would be different from {{SinglePartitionReadCommand.Group}} in that it
> wouldn't need to be split in per-partition commands when sending it to a
> replica. We could call it {{MultiPartitionReadCommand}}, for example.
> Such command would also be beneficial for the performance of regular IN CQL
> queries, since it would reduce the traffic between the coordinator and the
> replicas by grouping the queries sent to a replica.
> An alternative way of getting that performance gain could be modifying how
> the current {{SinglePartitionReadCommand.Group}} is executed on the
> {{StorageProxy}} so, instead of sending each of its internal
> {{SinglePartitionReadCommand}} s to the replicas, we could split it in
> smaller {{Group}} commands targeted to specific replicas, if that makes sense.
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