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https://issues.apache.org/jira/browse/SPARK-12062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15055207#comment-15055207
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Apache Spark commented on SPARK-12062:
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User 'BryanCutler' has created a pull request for this issue:
https://github.com/apache/spark/pull/10284
> Master rebuilding historical SparkUI should be asynchronous
> -----------------------------------------------------------
>
> Key: SPARK-12062
> URL: https://issues.apache.org/jira/browse/SPARK-12062
> Project: Spark
> Issue Type: Bug
> Components: Deploy
> Affects Versions: 1.0.0
> Reporter: Andrew Or
> Assignee: Bryan Cutler
>
> When a long-running application finishes, it takes a while (sometimes
> minutes) to rebuild the SparkUI. However, in Master.scala this is currently
> done within the RPC event loop, which runs only in 1 thread. Thus, in the
> mean time no other applications can register with this master.
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