使用Java客户端API连接到Cloudera VM上的Hbase：

Question

I am using the following JAVA code to establish the connection :

 Configuration hConfig = null;
        hConfig = HBaseConfiguration.create();
        hConfig.set("hbase.zookeeper.quorum", **zookepperQuorum**);
        hConfig.set("hbase.zookeeper.property.clientPort", **zookepperClientPort**);
 HBaseAdmin.checkHBaseAvailable(hConfig);

This is my ipConfig from CmdLine on windows :

Ethernet adapter Local Area Connection:

Link-local IPv6 Address . . . . . : fe80::a03b:5ec2:cc82:f952%12

IPv4 Address. . . . . . . . . . . : 10.108.0.87

Subnet Mask . . . . . . . . . . . : 255.255.254.0

Default Gateway . . . . . . . . . : 10.108.0.1

Ethernet adapter VirtualBox Host-Only Network:

Connection-specific DNS Suffix . :

Link-local IPv6 Address . . . . . : fe80::ecfb:969e:aa2e:1195%52

IPv4 Address. . . . . . . . . . . : 192.168.56.1

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

This is my Hosts file in the cloudera VM :

127.0.0.1 localhost.localdomain localhost

I tried out different things to connect to Hbase according to suggestions on the net, but those did not work for me.

I am getting the following error :

13/11/11 16:13:03 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: Connection refused: no further information

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

13/11/11 16:13:03 WARN zookeeper.RecoverableZooKeeper: Possibly transient ZooKeeper exception:

org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for

/hbase/hbaseid

13/11/11 16:13:03 INFO util.RetryCounter: Sleeping 4000ms before retry #2...

13/11/11 16:13:04 INFO zookeeper.ClientCnxn: Opening socket connection to server

localhost.localdomain/192.168.56.1:2181. Will not attempt to authenticate using SASL (unknown error)

13/11/11 16:13:05 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: Connection refused: no further information

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

13/11/11 16:13:06 INFO zookeeper.ClientCnxn: Opening socket connection to server localhost.localdomain/192.168.56.1:2181. Will not attempt to authenticate using SASL (unknown error)

It would be great if anyone can list steps which will help me in setting up the remote connection.

Answer 1

This answer is a bit late, but I hope others might benefit from it.

When getting the error "Session 0x0 for server null" one of the likely issues is that your HBase-code doesn't know where to connect. Best way to solve this is to load your hbase-site.xml config-file.

Configuration config = HBaseConfiguration.create();
config.addResource(new Path("/XXXX/hbase/hbase-0.98.9/conf/hbase-site.xml"));