Dan Bradley Computer Sciences Department University of Wisconsin-Madison Schedd On The Side

Schedd On The Side What is it? Specialized scheduler operating on schedd’s jobs. Job 1 Job 2 Job 3 Job 4 Job 5 … Job 4* job queue

Condor Farm Story Schedd Startd Resources Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Application condor_submit job queue Now that this is working, how can I use my collaborator’s resources too?

Option #1: Merge Farms › Combine machines with collaborator into one Condor resource pool. o Everything works just like it did before. o Excellent option for small to medium clusters. o Requires bidirectional connectivity to all startds, or equivalent via GCB. o Requires some administrative coordination (e.g. upgrades, negotiator policy, security, etc.)

Option #2: Flocking Together Schedd Local Startds Remote Startds full featured (std universe etc) automatic matchmaking easy to configure requires bidirectional connectivity both sites must run condor Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed

Gatekeeper X Option #3: Grid Universe Schedd Startds Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed easier to live with private networks may use non-Condor resources restricted Condor feature set (e.g. no std universe over grid) must pre-allocating jobs between vanilla and grid universe vanillasite X

Option #4: Routing Jobs Schedd Local Startds Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Schedd On The Side Gatekeeper X Y Z vanillasite X Random Seed Random Seed site Ysite Z dynamic allocation of jobs between vanilla and grid universes. not every job is appropriate for transformation into a grid job.

What About Flow Control? › May restrict routing to jobs which have been rejected by negotiator. › May limit maximum actively routed jobs on a per site basis. › May limit maximum idle routed jobs per site. › Periodic remove of idle routed jobs is possible, but no guarantee of optimal rescheduling. › Routing table may be reconfigured dynamically. › Multicast? Might be interesting to try.

What About I/O? › Jobs must be sandboxable (i.e. specifying input/output via transfer- files mechanism). › Routing of standard universe is not supported. › Additional restrictions may apply, depending on site network and disk.

What Types of Grids? › Routing table may contain any combination of grid types supported by the grid universe. › Example: Condor-C Schedd On The Side Schedd X Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed site X for two Condor sites, schedd-to-schedd submission requires no additional software however, still not as trivial to use as flocking

Routing Behind the Scenes Gatekeeper X Schedd On The Side Schedd X3 X2 navigate internal firewalls provide custom routes for special users improve scalability However, keep in mind I/O requirements etc.

Future Step: Glidein Factory Gatekeeper X Schedd Startds Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed Random Seed true late binding of jobs to resources may run on top of non-Condor sites supports full feature set of Condor (e.g. standard universe) requires GCB on network boundary (initiated by schedd-on-the-side?) home site X Schedd On The Side glidein jobs

Glideing in the Works Schedd On The Side glidein factory site X schedd-to-schedd schedd-to-gatekeeper hierarchical strategy for scalability and reliability better match for private networks may require some additional horsepower from gatekeeper machine, perhaps a dedicated element for “edge services”. Random Seed Random Seed Random Seed Random Seed Random Seed

Thanks Interested? Let us know. We are currently using job routing for specific users at UW. Dan Bradley Future development will focus on more use-cases.