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From "T Jake Luciani (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-8692) Coalesce intra-cluster network messages
Date Fri, 30 Jan 2015 19:11:36 GMT


T Jake Luciani updated CASSANDRA-8692:
    Attachment: batching-benchmark.png

Running some experiments I can see a big improvement with this ticket on a 6 node RF=3 cluster
writing at QUORUM.

The left half is without the patch the right half is with. From steady state of 80k/sec to
a steady state of 120k/sec

I will mention I get similar results by using nagle. However just enabling nagle will cause
small requests to slow down where as this approach adjusts.


> Coalesce intra-cluster network messages
> ---------------------------------------
>                 Key: CASSANDRA-8692
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>         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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