Major Description
From: https://reviews.apache.org/r/8684/
The patch contain two changes to the Curator update metadata methods:
o The new method, used by VFASTR, was converted to use the XML-RPC client instead of an embedded catalog, so that only one CAS catalog access the back-end store at a time
o The old method, used by other existing systems, was converted to use a shared Catalog instance, as opposed to create a new Catalog instance for each request. This is necessary to minimize use of resources, such as database connections.
Note that the second update method should also be converted to use the XML-RPC interface, but only when a proper testing platform is available.