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2015-07-11 06:24:41 -0500 commented answer Many to many service communication

"I'm not certain, but I believe service requests are handled serially by design." - this is true on the client side, but the service provider executes requests concurrently on separate threads... at least in rospy.

2015-07-09 02:52:41 -0500 answered a question Catkin insists on using 3.4 and nosetests 3.4, when configured to use python 2.7

In my experience CMake can insist on using cached PYTHON_EXECUTABLE and NOSETESTS variables even if you set PYTHON_VERSION to something different.

Try removing build and devel directories before rebuilding:

rm -r build devel && catkin_make -DPYTHON_VERSION=2.7