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From "Tupshin Harper (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8692) Coalesce intra-cluster network messages
Date Fri, 13 Mar 2015 19:22:39 GMT


Tupshin Harper commented on CASSANDRA-8692:

I commented on CASSANDRA-7032 that "It seems like there might be a way to constrain vnode
RDF (replication distribution factor) in the general scope of this ticket as well."

I feel like there are some very compelling availability arguments (in addition to these possible
performance optimizations) in favor of being able to constrain how many other nodes (within
a DC) that a given vnode-enabled node actually replicates with. 

e.g. you could have 256 vnodes, but guarantee that those 256 would only replicate to 32 (out
of possibly thousands) of other nodes.

> Coalesce intra-cluster network messages
> ---------------------------------------
>                 Key: CASSANDRA-8692
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 2.1.4
>         Attachments: batching-benchmark.png
> While researching CASSANDRA-8457 we found that it is effective and can be done without
introducing additional latency at low concurrency/throughput.
> The patch from that was used and found to be useful in a real life scenario so I propose
we implement this in 2.1 in addition to 3.0.
> The change set is a single file and is small enough to be reviewable.

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