Namenode GUI does not show actual memory usage
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Key: HADOOP-6071
URL: https://issues.apache.org/jira/browse/HADOOP-6071
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Affects Versions: 0.18.3
Reporter: Qi Liu
Priority: Minor
In the namenode GUI, the showed memory usage is not the actual memory usage.
Instead, it is the memory currently allocated to Java (Runtime.totalMemory()).
That's why we see most of the time, the memory usage is 100%. This is a concern
for operation, since this is the only page we can monitor the memory usage of a
name node. Showing 100% makes the wrong impression that there is a memory leak
in name node, and the name node needs to be restarted.
The current value should show would be Runtime.totalMemory() -
Runtime.freeMemory().
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