Distributed Lustre activity tracking

Abstract: Numerous administration tools and techniques require near real time vision of the activity occurring on a distributed filesystem. The changelog facility provided by Lustre to address this need suffers limitations in terms of scalability and flexibility. We have been working on reducing those limitations by enhancing Lustre itself and developing external tools such as Lustre ChangeLog Aggregate and Publish (LCAP) proxy. Beyond the ability to distribute changelog processing, this effort aims at opening new prospectives by making the changelog stream simpler to leverage for various purposes.