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https://issues.apache.org/jira/browse/SPARK-24738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-24738.
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Resolution: Incomplete
> [HistoryServer] FsHistoryProvider clean outdated event logs at start
> ---------------------------------------------------------------------
>
> Key: SPARK-24738
> URL: https://issues.apache.org/jira/browse/SPARK-24738
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.1
> Reporter: ShuMing Li
> Priority: Minor
> Labels: bulk-closed
>
> Now FsHistoryProvider's policy :
> * 1. FsHistoryProvider create checkEvent thread and cleanLog thread, they
> share one thread pool to avoid conflicts;
> * 2. check thread replay all event logs first;
> * 3. clean thread iterators all events to check the outdated events and
> remove about it;
>
> Why check thread at step2 not clean the outdated eventLogs at start, so no
> need replay the outdated logs to save times ?
>
> ```
> // Used by check event thread and clean log thread.
> // Scheduled thread pool size must be one, otherwise it will have concurrent
> issues about fs
> // and applications between check task and clean task
> ```
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