hi team,   I'm trying to establish connection to cloudera-hbase using hbase-client library. I'm not able to establish the connection and getting the following error.  exception:  org.apache.hadoop.hbase.MasterNotRunningException: org.apache.hadoop.hbase.MasterNotRunningException: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call to address=ip-172-1-4-7.ap-south-1.compute.internal:16000 failed on local exception: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call[id=0,methodName=IsMasterRunning], waitTime=60215ms, rpcTimeout=60000ms at org.apache.hadoop.hbase.client.ConnectionImplementation.isMasterRunning(ConnectionImplementation.java:723) at org.apache.hadoop.hbase.client.HBaseAdmin.available(HBaseAdmin.java:2367) at org.example.HBaseKerberos.main(HBaseKerberos.java:45) Caused by: org.apache.hadoop.hbase.MasterNotRunningException: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call to address=ip-172-1-4-7.ap-south-1.compute.internal:16000 failed on local exception: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call[id=0,methodName=IsMasterRunning], waitTime=60215ms, rpcTimeout=60000ms at org.apache.hadoop.hbase.client.ConnectionImplementation$MasterServiceStubMaker.makeStub(ConnectionImplementation.java:1359) at org.apache.hadoop.hbase.client.ConnectionImplementation.getKeepAliveMasterService(ConnectionImplementation.java:1425) at org.apache.hadoop.hbase.client.ConnectionImplementation.isMasterRunning(ConnectionImplementation.java:721) ... 2 more Caused by: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call to address=ip-172-1-4-7.ap-south-1.compute.internal:16000 failed on local exception: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call[id=0,methodName=IsMasterRunning], waitTime=60215ms, rpcTimeout=60000ms at org.apache.hadoop.hbase.ipc.IPCUtil.wrapException(IPCUtil.java:222) at org.apache.hadoop.hbase.ipc.AbstractRpcClient.onCallFinished(AbstractRpcClient.java:392) at org.apache.hadoop.hbase.ipc.AbstractRpcClient.access$100(AbstractRpcClient.java:92) at org.apache.hadoop.hbase.ipc.AbstractRpcClient$3.run(AbstractRpcClient.java:426) at org.apache.hadoop.hbase.ipc.AbstractRpcClient$3.run(AbstractRpcClient.java:421) at org.apache.hadoop.hbase.ipc.Call.setTimeout(Call.java:107) at org.apache.hadoop.hbase.ipc.RpcConnection$1.run(RpcConnection.java:134) at org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer$HashedWheelTimeout.run(HashedWheelTimer.java:715) at org.apache.hbase.thirdparty.io.netty.util.concurrent.ImmediateExecutor.execute(ImmediateExecutor.java:34) at org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:703) at org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:790) at org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:503) at java.lang.Thread.run(Thread.java:750) Caused by: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call[id=0,methodName=IsMasterRunning], waitTime=60215ms, rpcTimeout=60000ms at org.apache.hadoop.hbase.ipc.RpcConnection$1.run(RpcConnection.java:135) ... 6 more code :  public class HBaseKerberos{     public static void main(String[] args) throws IOException {         Scanner scanner = new Scanner(System.in);         try {             System.setProperty("sun.security.jgss.debug", "true");             System.setProperty("sun.security.krb5.debug", "true");             System.setProperty("sun.security.jgss.debug", "true");             System.setProperty("javax.security.auth.useSubjectCredsOnly","false");             System.setProperty("java.security.debug", "logincontext,policy,scl,gssloginconfig");             Configuration config = HBaseConfiguration.create();             config.addResource("/home/hduser/core-site.xml");             config.addResource("/home/hduser/hbase-site.xml");             config.addResource("/home/hduser/hdfs-site.xml");             config.set("hadoop.security.authentication", "kerberos");             config.set("hbase.zookeper.quorum", "ip-172-1-4-7.ap-south-1.compute.internal");             config.set("hbase.zookeeper.property.clientPort", "2181");             config.set("hbase.security.authentication","kerberos");             System.setProperty("java.security.krb5.conf","/etc/krb5.conf");             UserGroupInformation.setConfiguration(config);             UserGroupInformation.loginUserFromKeytab("hduser@EXAMPLE.COM","/home/hduser/kerbhduser.keytab");                       HBaseAdmin.available(config);             System.out.println("enter total record count");             int count = scanner.nextInt();             System.out.println("enter the batch size");             int batchSize = scanner.nextInt();             System.out.println("enter the delay for each batch");             int delayInterval = scanner.nextInt();             // Create connection to HBase             Connection connection = ConnectionFactory.createConnection(config);             System.out.println("enter the table name");             String  tableNameInput = scanner.next();             System.out.println("enter the start positon");             int startPos = scanner.nextInt();             TableName table1 = TableName.valueOf(tableNameInput);             String family1 = "customer";             String family2 = "order";             Admin admin = connection.getAdmin();             Table hTable = ConnectionFactory.createConnection().getTable(table1);             HTableDescriptor desc = new HTableDescriptor(table1);             desc.addFamily(new HColumnDescriptor(family1));             desc.addFamily(new HColumnDescriptor(family2));             if(!admin.tableExists(table1)) {                 admin.createTable(desc);             }         }   I have downloaded the hbase-site.xml , core-site.xml and hdfs-site.xml from Cloudera's hbase master role. Kindly help in this regard. ... View more