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The "GangliaMetrics" page has been changed by DominicDunlop: http://wiki.apache.org/hadoop/GangliaMetrics?action=diff&rev1=6&rev2=7 Comment: Note that Ganglia 3.1 support now in main line. Regret I could not work out exactly when patch applied. Help, someone? Be aware that versions 0.18.1, 0.19.0, and prior need to be patched in order to get Ganglia working; refer to [[https://issues.apache.org/jira/browse/HADOOP-3422|JIRA issue 3422]]. - Additionally, the Ganglia protocol change significantly between Ganglia 3.0 and Ganglia 3.1 (i.e., Ganglia 3.1 is not compatible with Ganglia 3.0 clients). This caused Hadoop to not work with Ganglia 3.1; there is currently a patch available for this, [[https://issues.apache.org/jira/browse/HADOOP-4675|HADOOP-4675]]. + Additionally, the Ganglia protocol change significantly between Ganglia 3.0 and Ganglia 3.1 (i.e., Ganglia 3.1 is not compatible with Ganglia 3.0 clients). This caused Hadoop to not work with Ganglia 3.1; there is a patch available for this, [[https://issues.apache.org/jira/browse/HADOOP-4675|HADOOP-4675]]. As of November 2010, this patch has been rolled into the mainline for 0.20.2 and later. To use the Ganglia 3.1 protocol in place of the 3.0, substitute {{{org.apache.hadoop.metrics.ganglia.GangliaContext31}}} for {{{org.apache.hadoop.metrics.ganglia.GangliaContext}}} in the hadoop-metrics.properties lines above.
