Fredrik Klauß created SPARK-46861:
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Summary: Potential Deadlock in DAGScheduler
Key: SPARK-46861
URL: https://issues.apache.org/jira/browse/SPARK-46861
Project: Spark
Issue Type: Bug
Components: Scheduler
Affects Versions: 4.0.0, 3.5.1, 3.4.3
Reporter: Fredrik Klauß
* 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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