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https://issues.apache.org/jira/browse/SPARK-19889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905207#comment-15905207
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Apache Spark commented on SPARK-19889:
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User 'hvanhovell' has created a pull request for this issue:
https://github.com/apache/spark/pull/17244
> Make TaskContext callbacks synchronized
> ---------------------------------------
>
> Key: SPARK-19889
> URL: https://issues.apache.org/jira/browse/SPARK-19889
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: Herman van Hovell
>
> In some cases you want to fork of some part of a task to a different thread.
> In these cases it would be very useful if {{TaskContext}} callbacks are
> synchronized and that we can synchronize on the task context.
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