Grid Information Services: alternate models Beth Plale Computer Science Dept. Indiana University Collaborator: Peter Dinda, Northwestern 07 June 2002

Types of Resource Information Grid Entity Description Organizations Accountable bodies and owners of resources People Resource admins, resource providers, GIS admins Physical resources Compute resources, network interfaces, benchmark results, number of users, load Services Job manager, load leveler, other GIS’ Comm resources Link capacity, switch capacity, error rate, drop rate Software packages BLAS, LAPACK, etc. Event producers Generators of event streams Event channels Propagators of event streams Event dictionaries List of commonly used event types Instruments Radar systems, telescopes, etc. Network paths Available bandwidth and expected latency Network topologies Hosts, switches, routers Wireless devices Wireless hosts, wavepoints, cells, etc. Virtual organizations Groups of collaborators 07 June 2002

Criteria for Inclusion in GIS An object in the repository represents an entity in the grid A grid entity has representation in the resource repository if: The grid entity can be described The grid entity has value to more than one application The grid entity is persistent (exists beyond single application run) 07 June 2002

Services Provided by GIS Query interface: client requests information via query in query language e.g., SELECT … FROM … WHERE in SQL Update interface: requests to add information to repository through language interface e.g., UPDATE … in SQL 07 June 2002

Services Provided by GIS Security interface Object level or column level? Access control Replication interface Provides replica transparency Management interface Turns self on and off Distribution (not a service, but a necessity) Hierarchical data partitions easily amongst administrative domains. 07 June 2002

Our absolute truths and logical conclusion Grid entities have complex relationships that are not captured in current GIS’. The kinds of questions asked of GIS data are more complex than the questions asked today. Some entities require rapid update rates. Fast query and update response time, and minimizing size of result are important goals. (1) Therefore: we are compelled to evaluate multiple data models against performance criteria (1) using use-case query benchmarks. 07 June 2002

start Entity Relationship schema diagram relat- ional (mySQL) ldap represented as transformed into relat- ional (mySQL) ldap (MDS) Grid GIS query benchmark XML (Xindice) 07 June 2002

Grid Resources: E-R Diagram availability clusters provides services network cards name, IP, os, physicalmemory, processor.load, storage.used, system.uptime is-a type, mfgBW host, port, protocol made of batch queue hosts end points has scalapac, lapack host benchmarks supports receives/ supplies instan. from application sources applications status switches switch benchmarks connections network paths routers traceroute packet loss, latency.roundtripDelay.ping, bandwidth.avail.TCP.singleStream network links network link benchmarks 07 June 2002

Grid Resources: Relational availability clusters services batch queue network cards type, mfgBW name, IP, os, physicalmemory, processor.load, storage.used, system.uptime host, port, protocol hosts end points host benchmarks scalapac, lapack application sources applications status switches switch benchmarks connections network paths routers traceroute packet loss, latency.roundtripDelay.ping, bandwidth.avail.TCP.singleStream network links network link benchmarks 07 June 2002

Grid Resources: Hierarchical GIS_top network paths connections hosts clusters services end points module execs host benchmarks network cards module sources batch queue routers switches network links Relationships parent, child (one -> many) switch benchmarks network link benchmarks alias (LDAP) or pointer (XML) 07 June 2002

Local control at Admin Domain Level -- similar to DNS requestor transformed XML doc 5. XSLT 1. Xpath query XML doc XPath XML doc 4. 2. 3. SQL LDAP XML db mySQL LDAP Local control at Admin Domain Level -- similar to DNS 07 June 2002

Areas of Overlap common schema start Entity Relationship schema diagram schema represented as Use cases to fuel benchmark queries transformed into relat- ional (mySQL) ldap (MDS) Grid GIS query benchmark XML (Xindice) 07 June 2002

ER diagram: Revised Network Topology nodes end points network compute paths A B C D type: switch, router E F AB AC AD BD CD … “give me all paths from A to E” G 07 June 2002