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Description of problem:
Every time I run yum, it emits the following message:
"Error: requested datatype primary not available"
after it successfully updates it's database for all repositories described in yum.repos.d

Version-Release number of selected component (if applicable):
yum-3.2.29-40.el6.centos.noarch

How reproducible:
EVERY time.

Steps to Reproduce:
1. yum update <anything, including nothing>
2.
3.

Actual results:
no modules updated

Expected results:
modules updated

Additional info:
"yum clean all" doesn't change a thing

FYI, this version of yum came bundled with Centos 6.4 (which I recently installed fresh).

The problem is not in yum. My advice would be to try to find out which repo is causing the problem. Probably renaming /var/cache/yum and running 'yum update' would help.