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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