Testing the Installation

To begin testing, start the Cloudera Manager Admin Console. Once you've logged in, the Home page should look something like this:

On the left side of the screen is a list of services currently running with their status information. All the services should be running with Good Health. You can click each service to view more detailed information about each service. You can also test your installation by either checking each Host's heartbeats, running a MapReduce job, or interacting with the cluster with an existing Hue application.

Checking Host Heartbeats

One way to check whether all the Agents are running is to look at the time since their last heartbeat. You can do this by clicking the Hosts tab where you can see a list of all the Hosts along with the value of their Last Heartbeat. By default, every Agent must heartbeat successfully every 15 seconds. A recent value for the Last Heartbeat means that the Server and Agents are communicating successfully.

Running a MapReduce Job

  1. Log into a host in the cluster.
  2. Run the Hadoop PiEstimator example using one of the following commands:
    • Parcel - sudo -u hdfs hadoop jar /opt/cloudera/parcels/CDH/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar pi 10 100
    • Package - sudo -u hdfs hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar pi 10 100
    or create and run the WordCount v1.0 application described in Hadoop Tutorial.
  3. Depending on whether your cluster is configured to run MapReduce jobs on the YARN or MapReduce service, view the results of running the job by selecting one of the following from the top navigation bar in the Cloudera Manager Admin Console :
    • Clusters > ClusterName > yarn Applications
    • Clusters > ClusterName > mapreduce Activities

    If you run the PiEstimator job on the YARN service (the default) you will see an entry like the following in yarn Applications:

Testing with Hue

A good way to test the cluster is by running a job. In addition, you can test the cluster by running one of the Hue web applications. Hue is a graphical user interface that allows you to interact with your clusters by running applications that let you browse HDFS, manage a Hive metastore, and run Hive, Impala, and Search queries, Pig scripts, and Oozie workflows.
  1. In the Cloudera Manager Admin Console Home > Status tab, click the Hue service.
  2. Click the Hue Web UI link, which opens Hue in a new window.
  3. Log in with the credentials, username: hdfs, password: hdfs.
  4. Choose an application in the navigation bar at the top of the browser window.

For more information, see the Hue User Guide.