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https://issues.apache.org/jira/browse/SPARK-46861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-46861.
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> Avoid Deadlock in DAGScheduler
> ------------------------------
>
> Key: SPARK-46861
> URL: https://issues.apache.org/jira/browse/SPARK-46861
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 3.5.1, 3.4.3, 4.0.0
> Reporter: Fredrik Klauß
> Assignee: Fredrik Klauß
> Priority: Major
> Labels: pull-request-available, releasenotes
> Fix For: 3.5.1, 3.4.3, 4.0.0
>
>
> * The DAGScheduler could currently run into a deadlock with another thread if
> both access the partitions of the same RDD at the same time.
> * To make progress in getCacheLocs, we require both exclusive access to the
> RDD partitions and the location cache. We first lock on the location cache,
> and then on the RDD.
> * When accessing partitions of an RDD, the RDD first acquires exclusive
> access on the partitions, and then might acquire exclusive access on the
> location cache.
> * If thread 1 is able to acquire access on the RDD, while thread 2 holds the
> access to the location cache, we can run into a deadlock situation.
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