If I write unit tests that indirectly initialize org.apache.spark.util.Utils, for example use sql types, but produce no logging, I get the following unpleasant stack trace in my test output.
This caused by the the Utils class adding a shutdown hook which logs the message logDebug("Shutdown hook called"). We are using log4j 2 for logging and if there has been no logging before this point then the static initialization of log4j 2 tries to add a shutdown hook itself but can't because JVM is already in shutdown. Its only slightly annoying but could be easily 'fixed' by adding a line like: logDebug("Adding shutdown hook) to Utils before adding the shutdown hook, so ensuring logging always initialized. I am happy to make this change, unless there is a better approach or considered too trivial. ERROR StatusLogger catching java.lang.IllegalStateException: Shutdown in progress at java.lang.ApplicationShutdownHooks.add(ApplicationShutdownHooks.java:66) at java.lang.Runtime.addShutdownHook(Runtime.java:211) at org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry.addShutdownHook(DefaultShutdownCallbackRegistry.java:136) at org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry.start(DefaultShutdownCallbackRegistry.java:125) at org.apache.logging.log4j.core.impl.Log4jContextFactory.initializeShutdownCallbackRegistry(Log4jContextFactory.java:123) at org.apache.logging.log4j.core.impl.Log4jContextFactory.<init>(Log4jContextFactory.java:89) at org.apache.logging.log4j.core.impl.Log4jContextFactory.<init>(Log4jContextFactory.java:54) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:408) at java.lang.Class.newInstance(Class.java:438) at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:96) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:102) at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:43) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:42) at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:285) at org.apache.spark.Logging$class.log(Logging.scala:52) at org.apache.spark.util.Utils$.log(Utils.scala:62) at org.apache.spark.Logging$class.initializeLogging(Logging.scala:138) at org.apache.spark.Logging$class.initializeIfNecessary(Logging.scala:107) at org.apache.spark.Logging$class.log(Logging.scala:51) at org.apache.spark.util.Utils$.log(Utils.scala:62) at org.apache.spark.Logging$class.logDebug(Logging.scala:63) at org.apache.spark.util.Utils$.logDebug(Utils.scala:62) at org.apache.spark.util.Utils$$anon$4$$anonfun$run$1.apply$mcV$sp(Utils.scala:178) at org.apache.spark.util.Utils$$anon$4$$anonfun$run$1.apply(Utils.scala:177) at org.apache.spark.util.Utils$$anon$4$$anonfun$run$1.apply(Utils.scala:177) at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1618) at org.apache.spark.util.Utils$$anon$4.run(Utils.scala:177) -- View this message in context: http://apache-spark-developers-list.1001551.n3.nabble.com/Unit-tests-can-generate-spurious-shutdown-messages-tp12557.html Sent from the Apache Spark Developers List mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@spark.apache.org For additional commands, e-mail: dev-h...@spark.apache.org