Remove JNI calls from ClusterStatus cstr
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Key: MAPREDUCE-1683
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1683
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Affects Versions: 0.20.2
Reporter: Chris Douglas
The {{ClusterStatus}} constructor makes two JNI calls to the {{Runtime}} to
fetch memory information. {{ClusterStatus}} instances are often created inside
the {{JobTracker}} to obtain other, unrelated metrics (sometimes from
schedulers' inner loops). Given that this information is related to the
{{JobTracker}} process and not the cluster, the metrics are also available via
{{JvmMetrics}}, and the jsps can gather this information for themselves: these
fields can be removed from {{ClusterStatus}}
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