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https://issues.apache.org/jira/browse/YARN-11916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18050429#comment-18050429
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ASF GitHub Bot commented on YARN-11916:
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steveloughran commented on PR #8170:
URL: https://github.com/apache/hadoop/pull/8170#issuecomment-3719615787
This is a backport; if yetus is happy I will merge
> FileSystemTimelineReaderImpl vulnerable to race conditions
> ----------------------------------------------------------
>
> Key: YARN-11916
> URL: https://issues.apache.org/jira/browse/YARN-11916
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: timelineserver
> Affects Versions: 3.4.2
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Labels: pull-request-available
>
> Yarn timelineserver FileSystemTimelineReaderImpl implementation does atomic
> updates via: copy, append, rename. This gives it bad scalability and
> concurrent calls will lose data.
> has bad concurrency on write and will lose updates. And its scalability
> Not plans to fix what was just the PoC of the v2 API, just
> * update javadocs
> * warn on startup that people should stop it.
> * do some other hardening while there, and test cleanup
> This code is @Private/@Unstable. Maybe we can move it into the -test jar.
> Nobody will complain.
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