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Currently, we are using tornado 5.x which does not seem to be developed any more as the upstream moved to 6.x version.

Upstream commit: https://github.com/ClusterLabs/pcs/commit/054018d0daf4493335f5619ca1cf9944a

Note: tornado has to be also updated during build in spec file.

After fix:

[root@r81-node-01 ~]# rpm -q pcs
pcs-0.10.3-1.el8.x86_64

[root@r81-node-01 ~]# rpm -ql pcs | grep "tornado-6"
/usr/lib/pcs/bundled/packages/tornado-6.0.3-py3.6.egg-info
/usr/lib/pcs/bundled/packages/tornado-6.0.3-py3.6.egg-info/PKG-INFO
/usr/lib/pcs/bundled/packages/tornado-6.0.3-py3.6.egg-info/SOURCES.txt
/usr/lib/pcs/bundled/packages/tornado-6.0.3-py3.6.egg-info/dependency_links.txt
/usr/lib/pcs/bundled/packages/tornado-6.0.3-py3.6.egg-info/top_level.txt

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1568