template<class CatalogTraversalT, class HashFilterT>
class GarbageCollectorAux< CatalogTraversalT, HashFilterT >
This file is part of the CernVM File System. Garbage collection for auxiliary files is much simpler than for catalogs. Auxiliary files are the tag database, meta info, and the certificate. These objects do not reference other objects. Also, they are not referenced from catalogs but from the manifest. Thus they become garbage immediately on publishing of a new revision with different objects (we still apply a grace period before deletion).
The reference log can provide a time-sorted list of object hashes. Since the hashes are unique (primary key), it is sufficient to walk through the list and remove all auxiliary objects older than X. In addition, we keep the versions of all auxiliary files provided through a hash filter. This is usually the objects referenced by the current manifest.
The timestamp X comes from the catalog garbage collection, which, as part of the catalog traversal, figures out the oldest catalog from the "previous
catalog" chain that needs to be preserved (named snapshots can be older). Auxiliary files produced during publish are at least as young as their corresponding root catalog.
Definition at line 34 of file gc_aux.h.
1.8.5 
