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This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1115)	at java.util.TreeMap$KeyIterator.next(TreeMap.java:1169)	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.collectSchedulerApplications(LeafQueue.java:1618)	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.getAppsInQueue(CapacityScheduler.java:1119)	at org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getQueueInfo(ClientRMService.java:798)	at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getQueueInfo(ApplicationClientProtocolPBServiceImpl.java:234)	at org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:333)	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013)	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007)