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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.PropertyConfigurator.parseCategory(PropertyConfigurator.java:759)	at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)	at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:440)	at org.apache.pig.Main.configureLog4J(Main.java:740)	at org.apache.pig.Main.run(Main.java:384)	at org.apache.pig.PigRunner.run(PigRunner.java:49)	at org.apache.oozie.action.hadoop.PigMain.runPigJob(PigMain.java:283)	at org.apache.oozie.action.hadoop.PigMain.run(PigMain.java:223)	at org.apache.oozie.action.hadoop.LauncherMain.run(LauncherMain.java:37)	at org.apache.oozie.action.hadoop.PigMain.main(PigMain.java:76)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:226)	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:430)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:422)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)