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A change in EPEL broke Scylla Python Script


When upgrading CentOS on a Scylla node, Scylla setup script, like scylla_prepare or scylla_setup fails with the following error:

traceback (most recent call last):
  File "/sbin/scylla_setup", line 29, in <module>
    from scylla_util import *
  File "/usr/lib/scylla/", line 31, in <module>
    import yaml
 ModuleNotFoundError: No module named 'yaml'


The source cause is a change in EPEL repository upgrade, breaking backward compatibility by moving from Python34 to Python36, and dropping PyYAML library in the process. Scylla uses PyYAML in a few of its Python scripts.


Install the python36 version of PyYAML

sudo yum install python36-PyYAML -y


In future releases, we will provide a more robust solution by encapsulating Python as part of Scylla Installation. More on this in the blog post The Complex Path for a Simple Portable Python Interpreter, or Snakes on a Data Plane.