Mikael Ståldal created SPARK-16416:
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Summary: Logging in shutdown hook does not work properly with
Log4j 2.x
Key: SPARK-16416
URL: https://issues.apache.org/jira/browse/SPARK-16416
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.6.2
Reporter: Mikael Ståldal
Spark registers some shutdown hooks, and they log messages during shutdown:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/ShutdownHookManager.scala#L58
Since the {{Logging}} trait creates SLF4J loggers lazily:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/internal/Logging.scala#L47
a SLF4J logger is created during the execution of the shutdown hook.
This does not work when Log4j 2.x is used as SLF4J implementation:
https://issues.apache.org/jira/browse/LOG4J2-1222
Even though Log4j 2.6 handles this more gracefully than before, it still does
emit a warning and will not be able to process the log message properly.
Proposed solution: make sure to eagerly create the SLF4J logger to be used in
shutdown hooks when registering the hook.
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