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https://issues.apache.org/jira/browse/RATIS-1886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17764735#comment-17764735
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Tsz-wo Sze edited comment on RATIS-1886 at 9/13/23 5:57 PM:
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[~liuyaolong], would it help if we set raft.server.log.appender.wait-time.min
(default=10ms) to a smaller value, say 1ms or even 0ms?
You may check the log for the actual wait-time used in the server.
{code}
2023-09-13 10:46:07,005
[s4@group-4B047F8B9293->s3-GrpcLogAppender-LogAppenderDaemon] INFO
server.RaftServerConfigKeys (ConfUtils.java:logGet(46)) -
raft.server.log.appender.wait-time.min = 0ns (custom)
{code}
was (Author: szetszwo):
[~liuyaolong], would it help if we set raft.server.log.appender.wait-time.min
(default=10ms) to a smaller value, say 1ms or even 0ms?
> 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
> 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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