Monitor HBase with Ganglia - Amazon EMR
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Monitor HBase with Ganglia

The Ganglia open-source project is a scalable, distributed system designed to monitor clusters and grids while minimizing the impact on their performance. When you enable Ganglia on your cluster, you can generate reports and view the performance of the cluster as a whole, as well as inspect the performance of individual node instances. For more information about the Ganglia open-source project, see http://ganglia.info/. For more information about using Ganglia with Amazon EMR clusters, see Ganglia.

After the cluster is launched with Ganglia configured, you can access the Ganglia graphs and reports using the graphical interface running on the primary node.

Ganglia stores log files on the primary node in the /mnt/var/lib/ganglia/rrds/ directory. Earlier release versions of Amazon EMR may store log files in the /var/log/ganglia/rrds/ directory.

To configure a cluster for Ganglia and HBase using the Amazon CLI
  • Use a create-cluster command similar to the following:

    aws emr create-cluster --name "Test cluster" --release-label emr-7.0.0 \ --applications Name=HBase Name=Ganglia --use-default-roles \ --ec2-attributes KeyName=myKey --instance-type m5.xlarge \ --instance-count 3
    Note

    If the default Amazon EMR service role and Amazon EC2 instance profile don't exist, an error occurs. Use the aws emr create-default-roles command to create them and then try again.

    For more information, see Amazon EMR commands in the Amazon CLI.

To view HBase metrics in the Ganglia web interface
  1. Use SSH to tunnel into the primary node and create a secure connection. For more information, see Option 2, part 1: Set up an SSH tunnel to the primary node using dynamic port forwarding in the Amazon EMR Management Guide.

  2. Install a web browser with a proxy tool, such as the FoxyProxy plug-in for Firefox, to create a SOCKS proxy for Amazon domains. For more information, see Option 2, part 2: Configure proxy settings to view websites hosted on the primary node in the Amazon EMR Management Guide.

  3. With the proxy set and the SSH connection open, you can view the Ganglia metrics by opening a browser window with http://master-public-dns-name/ganglia/, where master-public-dns-name is the public DNS address of the master server in the HBase cluster.

To view Ganglia log files on the primary node
  • If the cluster is still running, you can access the log files by using SSH to connect to the primary node and navigating to the /mnt/var/lib/ganglia/rrds/ directory. For EMR 3.x, navigate to the /var/log/ganglia/rrds directory. For more information, see Connect to the primary node using SSH in the Amazon EMR Management Guide.

To view Ganglia log files on Amazon S3
  • The Ganglia log files are not automatically written to Amazon S3 even if you enable logging for your cluster. To view Ganglia log files on Amazon S3, you must manually push the logs from /mnt/var/lib/ganglia/rrds/ to the S3 bucket.