Maxim Gekk created SPARK-25240:
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Summary: 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
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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