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https://issues.apache.org/jira/browse/HADOOP-5530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683265#action_12683265
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Tsz Wo (Nicholas), SZE commented on HADOOP-5530:
------------------------------------------------
The codes use
[Runtime.getRuntime().totalMemory()|http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#totalMemory()]
to obtain the first number. However, totalMemory() does not represent the
usage of the heap as described in the javadoc.
> The "Heap Size" in HDFS web ui may not be accurate
> --------------------------------------------------
>
> Key: HADOOP-5530
> URL: https://issues.apache.org/jira/browse/HADOOP-5530
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Tsz Wo (Nicholas), SZE
>
> It seems that the Heap Size shown in HDFS web UI is not accurate. It keeps
> showing 100% of usage. e.g.
> {noformat}
> Heap Size is 10.01 GB / 10.01 GB (100%)
> {noformat}
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