Cloudera Docs

Configuring the Hue Server to Store Data in the Oracle database

You can connect Hue to your Oracle database while installing Cloudera Runtime (and Hue).

Connect Hue Service to Oracle

If you want to connect Hue service to Oracle with an existing CDH installation, then connect and restart Hue without saving the data in your current database. Alternatively, you can migrate the old data into Oracle.

Existing CDH Installation

If you are using Oracle database with Hue and are upgrading to CDP 7.x from CDH 5 or CDH 6, then do the following:

Deactivate the Oracle Client Parcel

  1. Log on to Cloudera Manager.
  2. Go to the Parcels page by clicking Hosts > Parcels (or clicking the parcels icon Parcels icon).
  3. Click the Configuration > Check for New Parcels.
  4. Find ORACLE_INSTANT_CLIENT and click Deactivate.

Install Hue with Oracle database 12c and higher
  1. Download the zip files for the Instant Client Package, both Basic and SDK (with headers).

  2. Switch to the host with the downloaded files and upload zip to the Hue server host:
    scp instantclient-*.zip root@<hue server hostname>:.
  3. Arrange the client libraries to mirror the tree structure in the image as shown in the following example:
    # Create nested directories: /usr/share/oracle/instantclient/lib/
mkdir -pm 755 /usr/share/oracle/instantclient/lib

# Unzip. The files expand into /usr/share/oracle/instantclient/instantclient_<ver>/
unzip '*.zip' -d /usr/share/oracle/instantclient/

# Move lib files from instantclient_<ver> to /usr/share/oracle/instantclient/lib/
mv /usr/share/oracle/instantclient/`ls -l /usr/share/oracle/instantclient/ | grep instantclient_ | awk '{print $9}'`/lib* /usr/share/oracle/instantclient/lib/

# Move rest of the files to /usr/share/oracle/instantclient/
mv /usr/share/oracle/instantclient/`ls -l /usr/share/oracle/instantclient/ | grep instantclient_ | awk '{print $9}'`/* /usr/share/oracle/instantclient/

# Create symbolic links. Remember to edit version numbers as necessary
cd /usr/share/oracle/instantclient/lib
ln -s libclntsh.so.<ver>.1 libclntsh.so
ln -s libocci.so.<ver>.1 libocci.so

    where <ver> is the version of the Instant Client Package. Replace <ver> with the actual version of the Instant Client Package.

  4. Set the path for $ORACLE_HOME and $LD_LIBRARY_PATH as shown in the following example:
    export ORACLE_HOME=/usr/share/oracle/instantclient
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME/lib

Connect Hue to Oracle

If you are not migrating the current (or old) database, simply connect to your new Oracle database and restart Hue.

  1. [migration only] Stop Hue Service
    1. In Cloudera Manager, navigate to Cluster > Hue.
    2. Select Actions > Stop.
  2. [migration only] Dump Current Database
    1. Select Actions > Dump Database.
    2. Click Dump Database. The file is written to /tmp/hue_database_dump.json on the host of the Hue server.
    3. Log on to the host of the Hue server in a command-line terminal.
    4. Edit the /tmp/hue_database_dump.json file by removing all objects with useradmin.userprofile in the model field. For example:
      # Count number of objects
grep -c useradmin.userprofile /tmp/hue_database_dump.json
      vi /tmp/hue_database_dump.json
      {
  "pk": 1,
  "model": "useradmin.userprofile",
  "fields": {
    "last_activity": "2016-10-03T10:06:13",
    "creation_method": "HUE",
    "first_login": false,
    "user": 1,
    "home_directory": "/user/admin"
  }
},
{
  "pk": 2,
  "model": "useradmin.userprofile",
  "fields": {
    "last_activity": "2016-10-03T10:27:10",
    "creation_method": "HUE",
    "first_login": false,
    "user": 2,
    "home_directory": "/user/alice"
  }
},
    5. Remove the following lines from the /tmp/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'
    6. Save the /tmp/hue_database_dump.json file and exit.
  3. Connect to New Database
    1. Configure Database connections:
      • Go to Hue > Configuration and filter by category, Database.
      • Set database properties and click Save Changes:
      Hue Database Type (or engine): Oracle
Hue Database Hostname: <fqdn of host with Oracle server>
Hue Database Port: 1521
Hue Database Username: hue
Hue Database Password: <hue database password>
Hue Database Name (or SID): orcl
    2. Add support for a multi-threaded environment:
      • Filter by Category, Hue-service and Scope, Advanced.
      • Set Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini and click Save Changes:
      [desktop]
[[database]]
options={"threaded":true}
  4. [migration only] Synchronize New Database
    1. Select Actions > Synchronize Database
    2. Click Synchronize Database.
  5. [migration only] Load Data from Old Database
    sqlplus hue/<your hue password> < delete_from_tables.ddl
  6. Re/Start Hue service
    1. Navigate to Cluster > Hue.
    2. Select Actions > Start, and click Start.
    3. Click Hue Web UI to log on to Hue with a custom Oracle database.