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java.util.ConcurrentModificationException: 	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)	at java.util.LinkedList$ListItr.next(LinkedList.java:888)	at org.apache.hadoop.yarn.ContainerLogAppender.close(ContainerLogAppender.java:81)	at org.apache.log4j.helpers.AppenderAttachableImpl.removeAllAppenders(AppenderAttachableImpl.java:141)	at org.apache.log4j.Category.removeAllAppenders(Category.java:891)	at org.apache.log4j.Hierarchy.shutdown(Hierarchy.java:471)	at org.apache.log4j.LogManager.shutdown(LogManager.java:267)	at org.apache.hadoop.mapred.TaskLog.syncLogsShutdown(TaskLog.java:286)	at org.apache.hadoop.mapred.TaskLog$2.run(TaskLog.java:339)	at org.apache.hadoop.util.ShutdownHookManager$1.run(ShutdownHookManager.java:54)