Github user rajeshbalamohan commented on the issue:
https://github.com/apache/spark/pull/19184
I got into this with the limit of 32K. "unlimited" is another option which
can be a workaround for this. But that may not be a preferable option in
production systems. For e.g, with Q67 I observed 9000+ spill files in the task.
And with multiple tasks per executor, it ended up easily reaching the limits.
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