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https://issues.apache.org/jira/browse/SPARK-25283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maxim Gekk resolved SPARK-25283.
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Resolution: Fixed
Fix Version/s: 2.4.0
It is fixed by the PR: https://github.com/apache/spark/pull/22292
> A deadlock in UnionRDD
> ----------------------
>
> Key: SPARK-25283
> URL: https://issues.apache.org/jira/browse/SPARK-25283
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Maxim Gekk
> Priority: Major
> Fix For: 2.4.0
>
>
> The PR https://github.com/apache/spark/pull/21913 replaced Scala parallel
> collections in UnionRDD by new parmap function. This changes cause a deadlock
> in the partitions method. The code demonstrates the problem:
> {code:scala}
> val wide = 20
> def unionRDD(num: Int): UnionRDD[Int] = {
> val rdds = (0 until num).map(_ => sc.parallelize(1 to 10, 1))
> new UnionRDD(sc, rdds)
> }
> val level0 = (0 until wide).map { _ =>
> val level1 = (0 until wide).map(_ => unionRDD(wide))
> new UnionRDD(sc, level1)
> }
> val rdd = new UnionRDD(sc, level0)
> rdd.partitions.length
> {code}
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