Migrating Hue databases from CDH to Cloudera

You must migrate Hue data from the CDH cluster to Cloudera.

On your CDH environment enabled with Hue cluster migrate the Hue database:

In the Hue Web UI, click the home icon to view the documents that you plan to migrate.
In Cloudera Manager, stop the Hue service. Go to Hue and select Actions > Stop.

note
Refresh the web page to confirm that the Hue service is stopped.
From Cloudera Manager-> Hue -> Select Actions > Dump Database and click Dump Database.
This exports a JSON file that is database-agnostic. The file is written to
/tmp/hue_database_dump.json
on the host running the Hue service.
Log on to the host of the Hue server in a command-line terminal. You can find the hostname on the Dump Database window and at Hue > Hosts.
Remove the following lines from the hue_database_dump.json file.
ALERT: This appears to be a CM Managed environment
ALERT: HUE_CONF_DIR must be set when running hue commands in CM Managed environment
ALERT: Please run 'hue <command> --cm-managed'

On your Cloudera Data Platform environment:
1. In Cloudera Manager for the Cloudera environment that is, Cloudera Data Hub Cloudera Manager (not Data Lake Cloudera Manager), set up the database for Hue.
2. Synchronize: Select Actions > Synchronize Database and click Synchronize Database.
3. Truncate all the records in the Hue tables available under the Hue database.
  note
  Must be performed directly on the Hue database; there are no Hue commands or options in the UI to perform this task.
Additionally, on the Cloudera Data Platform environment: As no information is stored in the Hue database yet:
1. Copy the hue_database_dump.json from the CDH cluster to the Cloudera cluster.
2. Place the JSON file taken out from the legacy CDH Hue Cluster and place it in /tmp on the new Cloudera Hue server host.
  note
  The import process can only be run from one Hue server. Pick one to run the import process on and temporarily turn off the other Hue server instances.
  note
  The file name should not be changed from hue_database_dump.json.You must load the Hue dump using the CLI method and must NOT use the UI option via Hue Server.
3. Stop the Hue Service.
4. Run the following commands:
  cd /opt/cloudera/parcels/CDH/lib/hue
  ./build/env/bin/hue loaddata --ignorenonexistent /tmp/<HUE_DATABASE_JSON_FILE> --cm-managed
5. Start the Hue service.
6. From Cloudera Manager -> Hue -> Select Actions -> Synchronize: Select Actions > Synchronize Database and click Synchronize Database.
7. Start the Hue Service.