HDFS NameNode High Availability [HA]

This process sets up a standby NameNode configuration so that failover can happen automatically.

In order to setup HA, IBM Spectrum® Scale HDFS Transparency has to be unintegrated and revert back to native HDFS mode.

Follow these steps to configure High Availability option when IBM Spectrum Scale™ service is integrated:
  1. Log in to the Ambari GUI.
  2. If the Ambari GUI has IBM Spectrum Scale service deployed, and HDFS Transparency is integrated, follow the steps to Unintegrating HDFS Transparency.

    Ensure that you run the ambari-server restart.

  3. Verify that the IBM Spectrum Scale HDFS Transparency integration state is in unintegrated state. For more information, see Verifying Transparency integration state.
  4. From the Ambari dashboard, click the HDFS service.
    Select Actions > Enable NameNode HA and follow the steps.
    Note: NameNode needs to be deployed onto a GPFS™ Node.
  5. If the Ambari GUI has IBM Spectrum Scale service deployed, follow the steps under Integrating HDFS Transparency to integrate HDFS Transparency.

    Ensure that you run the ambari-server restart.

For more information on setting up the NameNode HA, see Hortonworks Configuring NameNode HA.