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https://issues.apache.org/jira/browse/HADOOP-4929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659138#action_12659138
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dhruba borthakur commented on HADOOP-4929:
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The current code displays used_memory = Runtime.getRuntime().totalMemory()
which is the amount of memory currently allocated to the process heap. I have
seen that when this value reaches close to the max-heap-memory, a garbage
collection is triggered.
What does Runtime.getRuntime().freeMemory() actually represent?
> ClusterStatus should report heap memory used
> --------------------------------------------
>
> Key: HADOOP-4929
> URL: https://issues.apache.org/jira/browse/HADOOP-4929
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Amar Kamat
> Priority: Minor
> Attachments: HADOOP-4929-v1.0.patch
>
>
> As of today {{ClusterStatus}} reports _total-available-heap-memory_ and
> _max-heap-memory_. I think it will be useful to show the _actual_ heap memory
> used i.e {{total - free}}. Note that this was introduced by HADOOP-4435.
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