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https://issues.apache.org/jira/browse/SPARK-21560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111566#comment-16111566
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Hyukjin Kwon commented on SPARK-21560:
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User 'xuanyuanking' has created a pull request for this issue:
https://github.com/apache/spark/pull/18760
> Add hold mode for the LiveListenerBus
> -------------------------------------
>
> Key: SPARK-21560
> URL: https://issues.apache.org/jira/browse/SPARK-21560
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.0, 2.2.0
> Reporter: Li Yuanjian
>
> As the comments in SPARK-18838, we also face the same problem about critical
> events dropped while the event queue is full.
> There's no doubt that improving the performance of the processing thread is
> important, whether the solution is multithreading or any others like
> SPARK-20776, but maybe we still need the hold strategy when the event queue
> is full, and restart after some room released. The hold strategy open or not
> and the empty rate should both configurable.
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