[jira] [Assigned] (RATIS-1886) AppendLog sleep fixed time cause significant drop in write throughput

["Tsz-wo Sze (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz-wo Sze reassigned RATIS-1886:
---------------------------------

    Assignee: Tsz-wo Sze

Let's change the default value to 1ms and support a lower unit microseconds and nanoseconds.

> AppendLog sleep fixed time cause significant drop in write throughput
> ---------------------------------------------------------------------
>
>                 Key: RATIS-1886
>                 URL: https://issues.apache.org/jira/browse/RATIS-1886
>             Project: Ratis
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 2.5.1
>            Reporter: Yaolong Liu
>            Assignee: Tsz-wo Sze
>            Priority: Major
>         Attachments: image-2023-09-13-15-44-00-933.png
>
>
> In https://issues.apache.org/jira/browse/RATIS-1793 , we enforce raft.server.log.appender.wait-time.min, which make GrpcLogAppender sleep fixed time during appendLog. This make alluxio master write throughput drop 50% and unacceptable. The ops of alluxio master could see below
>  !image-2023-09-13-15-44-00-933.png! 
> I noticed that this patch was introduced to avoid leader being too busy in some error conditions. Could we introduce sleep waiting when an error is discovered (maybe not easy) or find a way to locate the error condition and repair it completely? The performance degradation caused by sleeping for each appendLog request may be underestimated.



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