Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/491#issuecomment-89548376
I checked what are [valid absolute paths on
windows](https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx#paths).
Summary:
A path is relative if it does not begin with any of the following:
- A disk designator **with a backslash**, for example `C:\` or `d:\`.
- A single backslash, for example, `\directory` or `\file.txt`. This is
also referred to as an absolute path.
- A UNC name of any format, which always start with two backslash
characters (`\\`).
**Note:** A path with disk designator but without backslash (such as
`c:test.tmp`, or `D:tmp/test.tmp`) is relative.
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