[jira] [Commented] (IGNITE-22835) Latency penalty for using disruptor threads

["Stanislav Lukyanov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-22835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056547#comment-18056547 ] 

Stanislav Lukyanov commented on IGNITE-22835:
---------------------------------------------

I'm curious. why is it worse with rocks? And if it is, does it simply indicate that this optimization *sometimes* makes things worse, and the "sometimes" may happen with logit too?

> Latency penalty for using disruptor threads
> -------------------------------------------
>
>                 Key: IGNITE-22835
>                 URL: https://issues.apache.org/jira/browse/IGNITE-22835
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Vladislav Pyatkov
>            Assignee: Alexey Scherbakov
>            Priority: Major
>              Labels: ignite-3
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> h3. Motivation
> All three disruptors are part of the RAFT implementation. Each time a command has to be replicated, all the disruptors are used. This leads to a bad impact on the entire operation's latency.
> {noformat}
> onBeforeApplyCmd:%node_3344%JRaft-Request-Processor-3 0.2 5415400 5415600
>     Here is hidden 6.1 us
> RaftNodeOnEvent:%node_3344%JRaft-NodeImpl-Disruptor_stripe_2-0 0.0 5421700 5421700
> --
> RaftNodeOnEvent:%node_3344%JRaft-NodeImpl-Disruptor_stripe_2-0 0.0 5421700 5421700
>     Here is hidden 2.8 us
> LogManagerOnEvent:%node_3344%JRaft-LogManager-Disruptor_stripe_2-0 0.1 5424500 5424600
> --
> flushLog:%node_3344%JRaft-LogManager-Disruptor_stripe_2-0 18.7 5426400 5445100
>     Here is hidden 2.9 us
> FSMCallerOnEvent:%node_3344%JRaft-FSMCaller-Disruptor_stripe_1-0 0.1 5448000 5448100
> {noformat}
> h3. Definition of done
> * We can try to use the disruptor wait policy, depending on the case.
> * Maybe we can reduce a number of the dusruptor queues.



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