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Posted to hdfs-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2009/11/17 12:38:40 UTC

[jira] Created: (HDFS-775) FSDataset calls getCapacity() twice -bug?

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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