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https://issues.apache.org/jira/browse/SPARK-8577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604374#comment-14604374
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Josh Rosen commented on SPARK-8577:
-----------------------------------
Do you have a way to reliably reproduce this in non-test code?
Alternatively, do you have a thread dump which demonstrates the circular wait
condition involved in the deadlock?
> ScalaReflectionLock.synchronized can cause deadlock
> ---------------------------------------------------
>
> Key: SPARK-8577
> URL: https://issues.apache.org/jira/browse/SPARK-8577
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: koert kuipers
> Priority: Minor
>
> Just a heads up, i was doing some basic coding using DataFrame, Row,
> StructType, etc. in my own project and i ended up with deadlocks in my sbt
> tests due to the usage of ScalaReflectionLock.synchronized in the spark sql
> code.
> the issue went away when i changed my build to have:
> parallelExecution in Test := false
> so that the tests run consecutively...
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