https://community.cloudera.com/t5/Support-Questions/HBase-connection-issue-from-java/m-p/161904#M124283 <P>I am getting below error from from client machine (outside Hadoop cluster) when trying to access Hbase from java api</P><PRE>Mon Feb 06 15:40:51 IST 2017, RpcRetryingCaller{globalStartTime=1486374714593, pause=100, retries=35}, org.apache.hadoop.hbase.MasterNotRunningException: org.apache.hadoop.hbase.MasterNotRunningException: Can't get connection to ZooKeeper: KeeperErrorCode = ConnectionLoss for /hbase-unsecure at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:147) at org.apache.hadoop.hbase.client.HBaseAdmin.executeCallable(HBaseAdmin.java:3917) at org.apache.hadoop.hbase.client.HBaseAdmin.listTableNames(HBaseAdmin.java:413) at org.apache.hadoop.hbase.client.HBaseAdmin.listTableNames(HBaseAdmin.java:397) at com.bigframe.hbase.api.HDInsightHbase.main(HDInsightHbase.java:43) Caused by: org.apache.hadoop.hbase.MasterNotRunningException: org.apache.hadoop.hbase.MasterNotRunningException: Can't get connection to ZooKeeper: KeeperErrorCode = ConnectionLoss for /hbase-unsecure at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation$StubMaker.makeStub(ConnectionManager.java:1533) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation$MasterServiceStubMaker.makeStub(ConnectionManager.java:1553) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getKeepAliveMasterService(ConnectionManager.java:1704) at org.apache.hadoop.hbase.client.MasterCallable.prepare(MasterCallable.java:38) at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:124) ... 4 more Caused by: org.apache.hadoop.hbase.MasterNotRunningException: Can't get connection to ZooKeeper: KeeperErrorCode = ConnectionLoss for /hbase-unsecure at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.checkIfBaseNodeAvailable(ConnectionManager.java:906) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.access$400(ConnectionManager.java:545) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation$StubMaker.makeStubNoRetries(ConnectionManager.java:1483) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation$StubMaker.makeStub(ConnectionManager.java:1524) ... 8 more Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase-unsecure at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045) at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:221) at org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:541) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.checkIfBaseNodeAvailable(ConnectionManager.java:895) ... 11 more</PRE><P>MY code snapshot is below </P><PRE> Configuration config = HBaseConfiguration.create(); config.set("hbase.zookeeper.quorum", "zookeepernode0,zookeepernode1,zookeepernode2"); config.set("hbase.zookeeper.property.clientPort", "2181"); config.set("hbase.cluster.distributed", "true"); config.set("zookeeper.znode.parent","/hbase-unsecure"); HBaseAdmin admin = new HBaseAdmin(config); TableName[] tm = admin.listTableNames(); for(int i = 0; i&lt;tm.length;i++){ System.out.println(tm[i].getNameAsString()); }</PRE><P>Same code is running fine from inside hadoop cluster . Should I raise firewall request for hbase.zookeeper.quorum nodes from client machine ? Please help. This is urgent.</P> Mon, 06 Feb 2017 20:21:40 GMT arkaprova 2017-02-06T20:21:40Z