RLS and DRS Roadmap Items

Ann Chervenak

Robert Schuler

USC Information Sciences Institute

Replication Services

Replica Location Service (RLS) Maintains mappings between logical file names and

physical locations Associates attributes with mappings

Data Replication Service (DRS) Combines RLS cataloguing with data replication

operations performed by Reliable File Transfer Service (RFT)

RLS Roadmap:Pluggable RLS Backend

Current RLS backend is some type of relational database Good performance and scalability

Want to be able to support a backend mechanism for storing name mappings that is optimized to provide higher performance

Requestor: LIGO Pluggable backend to allow use of a

specialized hashing technique

RLS Roadmap (Requested):Improved Support for Bulk Renames

SCEC project adding and updating hundreds of thousands of entries

Would like better support for bulk modification command E.g., regular expression-based replacement of

filename prefixes

DRS Roadmap: Requirements analysis and improvements to DRS in support of LIGO

Design of DRS is based on LIGO's Lightweight Data Replicator service

Explore requirements for integrating DRS into the next generation of LIGO data architecture

Identify and implement enhancements to DRS to support the requirements of high-performance data Grids

DRS Roadmap: Replica Validation Capability

Design and implement replica validation and consistency checking

Requested by LIGO and others Current DRS supports on-demand replication of

data files between sites Once data has been replicated, there is no guarantee

that replica consistency will be maintained Users need the ability to validate replicated data

files and identify files that do not meet a specified equivalence criterion