Technical note added. If any revisions are required, please edit the "Technical Notes" field
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    New Contents:
The rhnplugin provided by the yum-rhn-plugin package downloaded all the repository metadata available, including others and filelist which were not required by the regular usage of yum. With this updated package, rhnplugin now downloads only relevant subpart of metadata.

Verified fix in yum-rhn-plugin-0.5.4-22.el5_7.1

Reproducer used:
1. Connect client to Satellite/RHN
2. In satellite do Software > Install > zsh
3. On client run: rhn_check
4. On client run: du -sh /var/cache/yum

    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -1 +1 @@
-The rhnplugin provided by the yum-rhn-plugin package downloaded all the repository metadata available, including others and filelist which were not required by the regular usage of yum. With this updated package, rhnplugin now downloads only relevant subpart of metadata.+Prior to this update, rhnplugin always downloaded all available repository metadata, including the filelist.xml and others.xml files, which are not required for regular Yum transactions. To prevent unnecessary disk space consumption, this update adapts rhnplugin to download only the metadata required for a particular Yum transaction.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-1198.html