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java.util.NoSuchElementException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:925)	at java.util.HashMap$KeyIterator.next(HashMap.java:956)	at org.apache.hadoop.security.UserGroupInformation.(UserGroupInformation.java:430)	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:452)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.hbase.util.Methods.call(Methods.java:37)	at org.apache.hadoop.hbase.security.User.call(User.java:624)	at org.apache.hadoop.hbase.security.User.callStatic(User.java:614)	at org.apache.hadoop.hbase.security.User.access$300(User.java:52)	at org.apache.hadoop.hbase.security.User$SecureHadoopUser.(User.java:431)	at org.apache.hadoop.hbase.security.User$SecureHadoopUser.(User.java:426)	at org.apache.hadoop.hbase.security.User.getCurrent(User.java:177)	at org.apache.hadoop.hbase.client.UserProvider.getCurrent(UserProvider.java:78)	at org.apache.hadoop.hbase.client.UserProvider.getCurrentUserName(UserProvider.java:62)	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionKey.(HConnectionManager.java:473)	at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:198)	at org.apache.hadoop.hbase.client.HTable.(HTable.java:151)	at org.apache.hadoop.hbase.client.HTableFactory.createHTableInterface(HTableFactory.java:36)	at org.apache.hadoop.hbase.client.HTablePool.createHTable(HTablePool.java:266)	at org.apache.hadoop.hbase.client.HTablePool.findOrCreateTable(HTablePool.java:196)	at org.apache.hadoop.hbase.client.HTablePool.getTable(HTablePool.java:175)	at org.opendaylight.tsdr.persistence.hbase.HBaseDataStore.getConnection(HBaseDataStore.java:112)	at org.opendaylight.tsdr.persistence.hbase.HBaseDataStore.create(HBaseDataStore.java:168)	at org.opendaylight.tsdr.persistence.hbase.TSDRHBasePersistenceServiceImpl.getMetrics(TSDRHBasePersistenceServiceImpl.java:100)	at org.opendaylight.tsdr.persistence.hbase.command.ListMetricsCommand.doExecute(ListMetricsCommand.java:45)	at org.apache.karaf.shell.console.AbstractAction.execute(AbstractAction.java:33)	at org.apache.karaf.shell.console.OsgiCommandSupport.execute(OsgiCommandSupport.java:39)	at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:33)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.aries.proxy.impl.ProxyHandler$1.invoke(ProxyHandler.java:54)	at org.apache.aries.proxy.impl.ProxyHandler.invoke(ProxyHandler.java:119)	at org.apache.karaf.shell.console.commands.$BlueprintCommand1938709604.execute(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.aries.proxy.impl.ProxyHandler$1.invoke(ProxyHandler.java:54)	at org.apache.aries.proxy.impl.ProxyHandler.invoke(ProxyHandler.java:119)	at org.apache.karaf.shell.console.commands.$BlueprintCommand1938709604.execute(Unknown Source)	at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78)	at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:477)	at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:403)	at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)	at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183)	at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120)	at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:89)	at org.apache.karaf.shell.console.impl.jline.ConsoleImpl$DelegateSession.execute(ConsoleImpl.java:521)	at org.apache.karaf.shell.console.impl.jline.ConsoleImpl.run(ConsoleImpl.java:212)	at java.lang.Thread.run(Thread.java:745)	at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3.doRun(ConsoleFactoryService.java:126)	at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3$1.run(ConsoleFactoryService.java:117)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.karaf.jaas.modules.JaasHelper.doAs(JaasHelper.java:47)	at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3.run(ConsoleFactoryService.java:115)