Nonsense first, this is more than half a month ago encountered the problem, while the historical record is still available to write down
Background: Three Aliyun Ubuntu servers, Hadoop (2.6.5), Zookeeper (3.4.10), HBase (1.2.6)
Problem: 1. Hadoop, Zookeeper, and HBase start in sequence. However, an error occurs when you run any command in HBase Shell.
ERROR: org, apache hadoop. Hbase. PleaseHoldException: Master is initializing or ERROR: Can't get master address from ZooKeeper; znode data == nullCopy the code2. When stop-hbase.sh is used, HRegionserver cannot be shut down. 3
Solution: Although the problem is reflected in HBase shell, the essential problem is that the Hadoop cluster is not properly connected. 1. The Ali Cloud server has a security group policy, and the three machines must communicate with each other in the outbound and inbound directions
| Master | Slave1 | Slave2 | |
|---|---|---|---|
| Master | Network IP | IP networks outside | IP networks outside |
| Slave1 | IP networks outside | Network IP | Network IP |
| Slave2 | IP networks outside | Network IP | Network IP |