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https://issues.apache.org/jira/browse/SPARK-25240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592590#comment-16592590
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Apache Spark commented on SPARK-25240:
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User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/22233
> Dead-lock in ALTER TABLE RECOVER PARTITIONS
> -------------------------------------------
>
> Key: SPARK-25240
> URL: https://issues.apache.org/jira/browse/SPARK-25240
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Maxim Gekk
> Priority: Major
>
> Recover Partitions in ALTER TABLE is performed in recursive way by calling
> the scanPartitions() method. scanPartitions() lists files sequentially or in
> parallel if the
> [condition|https://github.com/apache/spark/blob/131ca146ed390cd0109cd6e8c95b61e418507080/sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala#L685]
> is true:
> {code:scala}
> partitionNames.length > 1 && statuses.length > threshold ||
> partitionNames.length > 2
> {code}
> Parallel listening is executed on [the fixed thread
> pool|https://github.com/apache/spark/blob/131ca146ed390cd0109cd6e8c95b61e418507080/sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala#L622]
> which can have 8 threads in total. Dead lock occurs when all 8 cores have
> been already occupied and recursive call of scanPartitions() submits new
> parallel file listening.
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