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https://issues.apache.org/jira/browse/CASSANDRA-21645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21645:
--------------------------------------------
Description:
org.apache.cassandra.transport.Flusher#queued is consumed by single thread -
Netty even loop thread responsible for the correspondent channel handling, so
we can replace ConcurrentLinkedQueue with more specialized version such as
org.jctools.queues.MpscUnboundedArrayQueue. It also remove an allocation
present for ConcurrentLinkedQueue.
CPU usage in flamegraph ("Flusher\.enqueue" pattern), before: 1.17%, after:
0.46%
[^mpsc_flusher_before_cpu.html]
was:org.apache.cassandra.transport.Flusher#queued is consumed by single
thread - Netty even loop thread responsible for the correspondent channel
handling, so we can replace ConcurrentLinkedQueue with more specialized version
such as org.jctools.queues.MpscUnboundedArrayQueue
> Use MPSC queue in native transport flusher
> ------------------------------------------
>
> Key: CASSANDRA-21645
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21645
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Messaging/Client
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.0.x, 7.0
>
> Attachments: mpsc_flusher_after_cpu.html, mpsc_flusher_before_cpu.html
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> org.apache.cassandra.transport.Flusher#queued is consumed by single thread -
> Netty even loop thread responsible for the correspondent channel handling, so
> we can replace ConcurrentLinkedQueue with more specialized version such as
> org.jctools.queues.MpscUnboundedArrayQueue. It also remove an allocation
> present for ConcurrentLinkedQueue.
> CPU usage in flamegraph ("Flusher\.enqueue" pattern), before: 1.17%, after:
> 0.46%
> [^mpsc_flusher_before_cpu.html]
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