There is no trim() on paths in mapred.local.dir

This is a bug that I've first seen in CDH3b3.
The problem is that when naming multiple paths for mapred.local.dir in mapred-site.xml, the whitespace around paths is not trimmed.

The result is the following error popping up in the jobtracker log file:
"no valid local directories in property: mapred.local.dir"
When looking further in the stack trace, I see that in /org/apache/hadoop/conf/Configuration.java the creation of a file named "jobTracker/job_201105......_0001.xml" fails. This is no surprise as the file name that gets passed around contains a newline and whitespace.
When removing all whitespace and newlines from the config file, everything works as it should.

I think the method getStringCollection in /org/apache/hadoop/util/StringUtils.java should strip white space to fix this problem.