empty-string owners or groups causes {{MissingFormatWidthExeption}} in o.a.h.fs.shell.Ls.ProcessPath()
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Key: HADOOP-8168
URL: https://issues.apache.org/jira/browse/HADOOP-8168
Project: Hadoop Common
Issue Type: Bug
Components: fs
Affects Versions: 0.23.1, 0.24.0
Reporter: Eugene Koontz
In {{adjustColumnWidths()}}, we set the member variable {{lineFormat}}, which is used by {{ProcessPath()}}
to print directory entries. Owners and groups are formatted using the formatting conversion
{{%-Xs}}, where X is the max length of the owner or group. However, when trying this with
an S3 URL, I found that the owner and group were empty (""). This caused X to be 0, which
means that the formatting conversion is set to {{%-0s}}. This caused a {{MissingFormatWidthException}}
to be thrown when the formatting string was used in {{ProcessPath()}}.
Formatting conversions are described here:
http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#intFlags
The specific exception thrown (a subtype of {{IllegalFormatException}}) is described here:
http://docs.oracle.com/javase/1.5.0/docs/api/java/util/MissingFormatWidthException.html
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