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https://issues.apache.org/jira/browse/SPARK-29043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16927198#comment-16927198
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feiwang edited comment on SPARK-29043 at 9/11/19 2:26 AM:
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I think it is better to replay logs asynchronously.
was (Author: hzfeiwang):
I think we can change it to Asynchronous.
> [History Server]Only one replay thread of FsHistoryProvider work because of
> straggler
> -------------------------------------------------------------------------------------
>
> Key: SPARK-29043
> URL: https://issues.apache.org/jira/browse/SPARK-29043
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.4
> Reporter: feiwang
> Priority: Major
> Attachments: screenshot-1.png
>
>
> As shown in the attachment, we set spark.history.fs.numReplayThreads=30 for
> spark history server.
> However, there is only one replay thread work because of straggler.
> Let's check the code.
> https://github.com/apache/spark/blob/7f36cd2aa5e066a807d498b8c51645b136f08a75/core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala#L509-L547
> There is a synchronous operation for all replay tasks.
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