Update the Hive Metastore

Hortonworks Data Platform components configured for High Availability must use a NameService rather than a NameNode.

Use the following instructions to update the Hive Metastore to reference the NameService rather than a NameNode.

	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.

1. Open a command prompt on the machine hosting the Hive Metastore.
2. Set the HIVE_CONF_DIR environment variable:

   export HIVE_CONF_DIR=/etc/hive/conf.server

3. Execute the following command to retrieve a list of URIs for the filesystem roots, including the location of the NameService:

   hive --service metatool -listFSRoot

4. 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

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

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