Adar Dembo created KUDU-1973:
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Summary: Coalesce RPCs destined for the same server
Key: KUDU-1973
URL: https://issues.apache.org/jira/browse/KUDU-1973
Project: Kudu
Issue Type: Sub-task
Components: rpc, tserver
Affects Versions: 1.4.0
Reporter: Adar Dembo
The krpc subsystem ensures that only one _connection_ exists between any pair
of nodes, but it doesn't coalesce the _RPCs_ themselves. In clusters with dense
nodes (especially with a lot of tablets), there's often a great number of RPCs
sent between pairs of nodes.
We should explore ways of coalescing those RPCs. I don't know whether that
would happen within the krpc system itself (i.e. in a payload-agnostic way), or
whether we'd only coalesce RPCs known to be "hot" (like UpdateConsensus).
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