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MapReduce, mail # user - Querying cluster nodes list

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Querying cluster nodes list
John Lilley 2013-10-17, 19:43
I thought mistakenly that getClusterMetrics() would return information about the cluster's node, or about a queue's nodes, but this doesn't seem to be true - it is only a count.   How can a YARN application query the available node list on a cluster and what resources are configured on each node?