how did you install Rally? I assume you did pip3 install esrally?
Also:
On which operating system are you installing Rally?
What is your Python version?
To answer your question about "thespian": It is a so-called actor framework that lets different components of Rally communicate with each other (even across multiple machines). Also, version 3.6.2 of thespian is available on PyPI: https://pypi.python.org/pypi/thespian/3.6.2.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.