FSDataset calls getCapacity() twice -bug?
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Key: HDFS-775
URL: https://issues.apache.org/jira/browse/HDFS-775
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.22.0
Reporter: Steve Loughran
I'm not sure this is a bug or "as intended", but I thought I'd mention it.
FSDataset.getCapacity() calls DF.getCapacity() twice, when evaluating its
capacity. Although there is caching to stop the shell being exec'd twice in a
row, there is a risk that the first call doesn't run the shell, and the second
does -so the value changes during the method.
If that is not intended, it is better to cache the first value for the whole
method
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