[jira] [Created] (HADOOP-7487) DF should throw a more reasonable exception when mount cannot be determined

["Todd Lipcon (JIRA)" <ji...@apache.org>]

DF should throw a more reasonable exception when mount cannot be determined
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                 Key: HADOOP-7487
                 URL: https://issues.apache.org/jira/browse/HADOOP-7487
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon


Currently, when using the DF class to determine the mount corresponding to a given directory, it will throw the generic exception "Expecting a line not the end of stream" if it can't determine the mount (for example if the directory doesn't exist).

This error message should be improved in several ways:
# If the dir to check doesn't exist, we can see that before even execing df, and throw a better exception (or behave better by chopping path components until it exists)
# Rather than parsing the lines out of df's stdout, collect the whole output, and then parse. So, if df returns a non-zero exit code, we can avoid trying to parse the empty result
# If there's a success exit code, and we still can't parse it (eg incompatible OS), we should include the unparseable line in the exception message.

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