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Posted to issues@spark.apache.org by "Maxim Gekk (JIRA)" <ji...@apache.org> on 2018/08/25 13:37:00 UTC
[jira] [Created] (SPARK-25240) Dead-lock in ALTER TABLE RECOVER
PARTITIONS
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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