[jira] Created: (MAPREDUCE-1683) Remove JNI calls from ClusterStatus cstr

["Chris Douglas (JIRA)" <ji...@apache.org>]

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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