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https://issues.apache.org/jira/browse/MAPREDUCE-1683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855540#action_12855540
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Vinod K V commented on MAPREDUCE-1683:
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+1 for leaving the memory vals in the detailed info.
Patch for 20 looks good too.
When working on the trunk patch, we should cleanup/remove all the useless
constructors - constructors are all package private so no harm in doing a
cleanup here, I think.
> 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
> Attachments: MAPREDUCE-1683_yhadoop_20_9.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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