1. and Alexandre Duarte OurGrid/EELA Interoperability Meeting
Campina Grande,
- Campina Grande, OurGrid/EELA interoperability meeting

2. Interoperability Port OurGrid applications to EELA/gLite
Port gLite applications to OurGrid
Use OurGrid resources to execute jobs submitted to EELA
Use EELA resources to execute jobs submitted to OurGrid
- Campina Grande, OurGrid/EELA interoperability meeting

3. EELA Infrastructure
- Campina Grande, OurGrid/EELA interoperability meeting

4. Current Status
- Campina Grande, OurGrid/EELA interoperability meeting

5. Application Porting
- Campina Grande, OurGrid/EELA interoperability meeting

6. Port OurGrid Applications to EELA/gLite
The OurGrid JDFs are written using a “subset” of the gLite Job Description Language
We just need to write a simple translator from OurGrid JDF to a gLite JDL describing a Job Collection
Each OurGrid task will be a Job in a gLite job Collection
The Input and Output sandboxes will mention only local files
May need a dictonary to translate job requirements
- Campina Grande, OurGrid/EELA interoperability meeting

7. Port EELA/gLite applications to OurGrid
Two main aspects to consider:
How to deal with DAG jobs ?
How to process input and output sandboxes
Build a Job Submitter able to:
Convert the gLite JDL to a OurGrid JDF
Translating all filenames in input and output sandboxes into local file names
May need a dictionary to translate job requirements
In the case of a DAG it have to create one JDFs for each Node
Download all non-local files in the input sandbox to the local file system
Submit the Job(s) to MyGrid following (if present) the DAG
Upload all non-local files in the output sandbox to their target location
- Campina Grande, OurGrid/EELA interoperability meeting

8. Use OurGrid resources to execute jobs submitted to EELA
- Campina Grande, OurGrid/EELA interoperability meeting

9. Job Submission Reviewed
- Campina Grande, OurGrid/EELA interoperability meeting

10. Computing Element
Accepts batch jobs (and job control requests) through a gatekeeper
Performs the necessary AAA operations and map to a local user
Passes the job to a layer that interacts with the local resource manager
BLAH
Monitors the status of the jobs and reports it to the client
Client
Grid
Computing
Element
Monitoring
Site
AAA and
local mapping
Job
Controller
AAA - Authentication Authorization Accounting WN
LRMS
- Campina Grande, OurGrid/EELA interoperability meeting

11. BLAH
The BLAHP (Batch Local ASCII Helper Protocol) provides a set of plain ASCII commands to manage jobs on the batch systems.
Batch system interactions
Not part of the daemon's core.
Performed via external scripts with a common syntax among different batch systems.
Three scripts for every batch system:
xxx_submit
xxx_status
xxx_cancel
The effort for batch system abstraction is concentrated in these scripts.
Adding support for new batch systems requires “only” to write a new set of scripts.
- Campina Grande, OurGrid/EELA interoperability meeting

12. Proposed Solution
Create a plugin for BLAH that can interact with MyGrid using it as a LRMS
Problems:
Can we really consider MyGrid a LRMS?
There are some strong assumptions on batch systems:
“There must be a way to dispatch files to running jobs.”
Client
Grid
Computing
Element
Monitoring
Site
AAA and
local mapping
Job
Controller
MyGrid
BLAH
Plugin
OurGrid
Peer
- Campina Grande, OurGrid/EELA interoperability meeting

13. Use EELA resources to execute jobs submitted to OurGrid
- Campina Grande, OurGrid/EELA interoperability meeting

14. OurGrid Archictecture
- Campina Grande, OurGrid/EELA interoperability meeting

15. Proposed Solution MyGrid X.509 gLite Peer OurGrid Computing Workload1
gLite
Peer 6 2
OurGrid
Workers
Computing
Element
Workload
Manager
Computing
Element 5 3
Worker Nodes
Computing
Element
Computing
Element
Computing
Element 4
- Campina Grande, OurGrid/EELA interoperability meeting

16. I think that we may have answered the What
I think that we may have answered the What. Now we need to answer Who and When.
- Campina Grande, OurGrid/EELA interoperability meeting