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https://issues.apache.org/jira/browse/SPARK-3093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14100229#comment-14100229
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Apache Spark commented on SPARK-3093:
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User 'CrazyJvm' has created a pull request for this issue:
https://github.com/apache/spark/pull/2008
> masterLock in Worker is no longer need
> --------------------------------------
>
> Key: SPARK-3093
> URL: https://issues.apache.org/jira/browse/SPARK-3093
> Project: Spark
> Issue Type: Improvement
> Reporter: Chen Chao
>
> there's no need to use masterLock in Worker now since all communications are
> within Akka actor
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