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https://issues.apache.org/jira/browse/SPARK-20952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033385#comment-16033385
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Apache Spark commented on SPARK-20952:
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User 'robert3005' has created a pull request for this issue:
https://github.com/apache/spark/pull/18176
> TaskContext should be an InheritableThreadLocal
> -----------------------------------------------
>
> Key: SPARK-20952
> URL: https://issues.apache.org/jira/browse/SPARK-20952
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: Robert Kruszewski
> Priority: Minor
>
> TaskContext is a ThreadLocal as a result when you fork a thread inside your
> executor task you lose the handle on the original context set by the
> executor. We should change it to InheritableThreadLocal so we can access it
> inside thread pools on executors.
> See ParquetFileFormat#readFootersInParallel for example of code that uses
> thread pools inside the tasks.
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