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Posted to issues@kudu.apache.org by "Grant Henke (Jira)" <ji...@apache.org> on 2020/06/02 16:06:00 UTC
[jira] [Updated] (KUDU-1790) "Master lookup permit" design wastes
lots of reactor thread CPU
[ https://issues.apache.org/jira/browse/KUDU-1790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Grant Henke updated KUDU-1790:
------------------------------
Labels: scalability (was: )
> "Master lookup permit" design wastes lots of reactor thread CPU
> ---------------------------------------------------------------
>
> Key: KUDU-1790
> URL: https://issues.apache.org/jira/browse/KUDU-1790
> Project: Kudu
> Issue Type: Bug
> Components: client
> Affects Versions: 1.1.0
> Reporter: Todd Lipcon
> Priority: Major
> Labels: scalability
> Attachments: fg.svg
>
>
> Looking at some stress tests, I see that the reactor thread is spending a significant percent of its CPU time in LookupRpc::SendRpcCb, and doing thousands of futex calls per second. It seems like the current approach of linear backoff of TryWait calls is not a good design, and we should probably do something less busy-wait-like to avoid this problem.
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