Condor and Web Services

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Condor and Web Services
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Outline

• Current API
• What are Web Services and SOAP?
• Benefits of a Condor SOAP API
• Functionality and examples
• State of the implementation
• Future features

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Current API

• Use command-line tools directly
• Applications use command-line tools via system
  calls

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What are web services?

• Applications accessible typically over HTTP using
  SOAP and XML
• Standards exist for
• discovery of services
• description of application interfaces (WSDL)
• communication mechanisms (RPC)
• and many other things

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What is SOAP?

• Simple Object Access Protocol
• Mechanism for doing RPC using XML
• typically over HTTP
• A World Wide Web Consortium (W3C) standard

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Benefits of a Condor SOAP API

• Condor becomes a service
• Can be accessed with standard web service tools
• Condor accessible from platforms where its
  command-line tools are not supported
• Talk to Condor with your favorite language and
  SOAP toolkit

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Condor SOAP API in the wild

• Condor called from Business Process Execution
  Language (BPEL) workflows (LBL)
• Portal providing web interface to Condor pools
  (Indiana University)

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Condor SOAP API functionality

• Submit jobs
• Retrieve job output
• Remove/hold/release jobs
• Query machine status
• Query job status

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Getting machine status via SOAP
Your program
condor_collector
queryStartdAds()
Machine List
SOAP library
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Getting machine status viaSOAP (in Java with
Axis)

• locator new CondorCollectorLocator()

collector locator.getcondorCollector(new
URL(http//machineport))
ads collector.queryStartdAds(Memorygt512)
Because we give you WSDL information you
dont have to write any of these functions.
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Submitting jobs

• Begin transaction
• Create cluster
• Create job
• Send files
• Describe job
• Commit transaction
• Two phase commit for reliability

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Current implementation

• Working prototype exists
• Expected release in 6.7 series

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Future features

• Support for authenticated access
• Support for notification
• Becoming a grid service

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Questions?