chenzhx commented on pull request #34292:
URL: https://github.com/apache/spark/pull/34292#issuecomment-949581186
@HyukjinKwon Sorry to reply you so late.
Currently spark cannot trigger this deadlock. So we wrote our own test to
verify the effectiveness of this change.
In our external catalog code base, We write a UT to call
SessionCatalog.getTempViewOrPermanentTableMetadata in one thread and while
calling spark.sql("show databases") in other thread. Without this patch, a
deadlock occurs and timeout exception was thrown. With this patch, UT works
correctly.
We also tested this patch on the client's production environment, and the
deadlock is fixed.
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