[jira] Commented: (HDFS-94) The "Heap Size" in HDFS web ui may not be accurate

[dhruba borthakur (JIRA)]

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https://issues.apache.org/jira/browse/HDFS-94?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777438#action_12777438
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dhruba borthakur commented on HDFS-94:
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Currently, the code uses
{quote}
    long totalMemory = Runtime.getRuntime().totalMemory();
    long maxMemory = Runtime.getRuntime().maxMemory();
    long used = (totalMemory * 100)/maxMemory;

{quote}

Is it better to use :

{quote}
    MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
    MemoryUsage status = memoryMXBean.getHeapMemoryUsage();
    usedMemory = status.getUsed();
    maxMemory = status.getMax();
{quote}

> The "Heap Size" in HDFS web ui may not be accurate
> --------------------------------------------------
>
>                 Key: HDFS-94
>                 URL: https://issues.apache.org/jira/browse/HDFS-94
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            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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