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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-775) FSDataset calls getCapacity() twice -bug?
Date Tue, 17 Nov 2009 11:38:39 GMT
FSDataset calls getCapacity() twice -bug?
-----------------------------------------

                 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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