Yelp/mrjob — pull request #943 by jblomo (2014-08-22 22:27:38+00:00)
Title: use the xtrace flag to get more debugging output during bootstrap/runner

When running bootstrap commands, failures can be very mysterious. What command was actually run? What environment variables were properly interpolated? By adding the xtrace flag, the script will send to stderr the commands that are actually run. This should allow the user to debug the error.