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https://issues.apache.org/jira/browse/MAPREDUCE-1683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Lu reassigned MAPREDUCE-1683:
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Assignee: Luke Lu
> Remove JNI calls from ClusterStatus cstr
> ----------------------------------------
>
> 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
> Assignee: Luke Lu
> Attachments: MAPREDUCE-1683_part2_yhadoop_20_10.patch,
> MAPREDUCE-1683_yhadoop_20_9.patch, MAPREDUCE-1683_yhadoop_20_S.patch
>
>
> 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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