Scaling Namespaces and Optimizing Data Storage
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Using cluster web console to monitor a federation

The cluster web console for a federation helps you monitor the cluster. You can use any NameNode in the cluster to access the console at http://<namenode_host:port>/dfsclusterhealth.jsp.

The cluster web console provides the following information:

  • A cluster summary that shows the number of files, number of blocks, total configured storage capacity, and the available and used storage for the entire cluster.

  • A list of NameNodes and a summary that includes the number of files, blocks, missing blocks, and live and dead DataNodes for each NameNode. The summary also provides a link to access the web UI for each NameNode.

  • The decommissioning status of DataNodes.