We recently upgraded to HDP 2.5 and now hiveserver2 fails to connect after a day or two org.apache.hive.service.cli.HiveSQLException: Failed to open new session: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.IllegalArgumentException: java.net.UnknownHostException: NAMENODE_FQDN at org.apache.hive.service.cli.session.SessionManager.openSession(SessionManager.java:289) at org.apache.hive.service.cli.CLIService.openSessionWithImpersonation(CLIService.java:204) at org.apache.hive.service.cli.thrift.ThriftCLIService.getSessionHandle(ThriftCLIService.java:421) at org.apache.hive.service.cli.thrift.ThriftCLIService.OpenSession(ThriftCLIService.java:316) at org.apache.hive.service.cli.thrift.TCLIService$Processor$OpenSession.getResult(TCLIService.java:1257) at org.apache.hive.service.cli.thrift.TCLIService$Processor$OpenSession.getResult(TCLIService.java:1242) at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39) at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39) at org.apache.hive.service.auth.TSetIpAddressProcessor.process(TSetIpAddressProcessor.java:56) at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.IllegalArgumentException: java.net.UnknownHostException: NAMENODE_FQDN at org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:83) at org.apache.hive.service.cli.session.HiveSessionProxy.access$000(HiveSessionProxy.java:36) at org.apache.hive.service.cli.session.HiveSessionProxy$1.run(HiveSessionProxy.java:63) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1724) at org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:59) at com.sun.proxy.$Proxy23.open(Unknown Source) at org.apache.hive.service.cli.session.SessionManager.openSession(SessionManager.java:281) ... 12 more Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: java.net.UnknownHostException: NAMENODE_FQDN at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:543) at org.apache.hive.service.cli.session.HiveSessionImpl.open(HiveSessionImpl.java:144) at sun.reflect.GeneratedMethodAccessor58.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:78) ... 20 more Caused by: java.lang.IllegalArgumentException: java.net.UnknownHostException: NAMENODE_FQDN at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:438) at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:311) at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:688) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:629) at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:159) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2761) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:99) at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2795) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2777) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:386) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:179) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:526) ... 25 more Caused by: java.net.UnknownHostException: NAMENODE_FQDN I do have my NAMENODE_FQDN in /etc/hosts file. But after restart of hiveserver2 in ambari it works just fine but fails again after a day or two. , ... View more