We have the HDP 1.2 installed here in our Dev/ST/Prod and we have the HDFS, MapReduce etc. all working..
However, we encountered the error below with the HBase shell:
hbase(main):003:0> version
0.94.2.21, rUnknown, Thu Jan 10 03:45:56 PST 2013
hbase(main):004:0> status
14/09/17 20:55:18 ERROR zookeeper.RecoverableZooKeeper: ZooKeeper exists failed after 3 retries
14/09/17 20:55:18 WARN zookeeper.ZKUtil: hconnection Unable to set watcher on znode /hbase/master
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase/master
at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1041)
at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:166)
at org.apache.hadoop.hbase.zookeeper.ZKUtil.watchAndCheckExists(ZKUtil.java:230)
at org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.start(ZooKeeperNodeTracker.java:82)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.ensureZookeeperTrackers(HConnectionManager.java:591)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getMaster(HConnectionManager.java:650)
at org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:110)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)