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Wiki MarkupApache OODT CAS Resource Management component (or Resource Manager for short) sends Jobs to resource nodes to be executed and Resource manager should be able to monitor each of these resource nodes of a cluster on demand. The idea is to leverage on Ganglia \ [1\] in monitoring those resource nodes.
Ganglia is a BSD-licensed scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization.

System overview 

Ganglia plugin connects to a Ganglia metadata daemon (Gmetad) and pull the XML dump and parses it. This is happened by connecting a socket to the relevant port of the machine running Gmetad and obtain the XML of the last status monitored which consists of aggregated status of all resource nodes of the clusters.
After getting the last status monitored of the grid (set of clusters) Resource nodes’ loads will be calculated by the Ganglia plugin according to the configured load calculator module.
Load will be normalized into the range of 0 and the particular node’s capacity by the load calculator module.

...

• Following entry holds the information about the Ganglia metadata daemon that the plugin should be connected to.
  #ganglia meta daemon (gmetad) host details
  org.apache.oodt.cas.resource.monitor.ganglia.gemtad.host.address=localhost
  org.apache.oodt.cas.resource.monitor.ganglia.gemtad.host.port=8651

References

Wiki Markup_\[1\] “Ganglia Monitoring System” \ [Online\]. Available:_ _[http://ganglia.info/]_ _\[Accessed 4 August 2013\]._unmigrated-wiki-markup

_\[2\] "Monitor that plugs into Ganglia" \ [Online\]. Available: https://issues.apache.org/jira/browse/OODT-219 \ [Accessed 11 August 2013\] _