2.2. Update the Hive Metastore

HDP components configured for HA must use a NameService rather than a NameNode. Use the following instructions to update the Hive Metastore to reference the NameService rather than a Name Node.

	Note
	Hadoop administrators also often use the following procedure to update the Hive metastore with the new URI for a node in a Hadoop cluster. For example, administrators sometimes rename an existing node as their cluster grows.

Open a command prompt on the machine hosting the Hive metastore.

Set the HIVE_CONF_DIR environment variable:

export HIVE_CONF_DIR=/etc/hive/conf.server

Execute the following command to retrieve a list of URIs for the filesystem roots, including the location of the NameService:
```
hive --service metatool -listFSRoot
```
Execute the following command with the -dryRun option to test your configuration change before implementing it:
```
hive --service metatool -updateLocation <nameservice-uri> <namenode-uri> - dryRun
```

Execute the command again, this time without the -dryRun option:

hive --service metatool -updateLocation <nameservice-uri> <namenode-uri>

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