Error1: org.apache.hadoop.hbase.NotServingRegionException:
Error 2: Can’t get master address from ZooKeeper; znode data == null

[root@hadoop01 bin]# sh hbase hbck
2022-01-29 16:48:49,797 INFO  [main] client.HConnectionManager$HConnectionImplementation: getMaster attempt 9 of 35 failed; retrying after sleep of 10044, exception=java.io.IOException: Can't get master address from ZooKeeper; znode data == null

Solution:

Stop HBase and go to the bin directory of HBase

sh stop-hbase.sh

Start the zookeeper client and delete the/HBase node

[root@hadoop01 bin]# sh zkCli.sh
[zk: localhost:2181(CONNECTED) 1] rmr /hbase

Restart HBase cluster

sh start-hbase.sh