2009 April 17

Present: Mark, Des, Dominik

1. The main objective of the meeting
   • internal discussion on communication protocols and behaviour of software modules
   • updates and changes in software modules
2. Data in communication protocol
   • the integer identifier for radio telescope, TN and correlator will NOT be a part of a protocol
   • each resource will be distinguished by service URL
   • the integer experimentId field will be changed to String jobId. This jobId value has to be added to the communication protocol.
   • the jobId value is used differentiate data in case where the same experiment data is being correlated at the same time, but with different parameters
3. Translation Node related issues
   • there was a discussion on how to distinguish chunks from different TNs
     • each chunk has its own identifier (long)
     • we agreed that if chunks from different TN have the same identifiers we can treat them as corresponding chunks and correlate them
       • it is TN job to make sure that chunks receive proper identifiers
4. Confirmation messages
   • the communication pattern between Broker and TN will be changed as follows:
     • all messages are asynchronous
     • Broker sends startTranslationJob message to TN
     • TN decodes the message and sends back information to VLBI Broker with the status OK or ERROR
       • that operation should be added to the protocol [Dominik]
     • then TN sends notifications that new data chunks are ready
   • chunkCount should be added to ChunkInfo so Broker knows how many chunks will be sent by TN
     • Des needs to update the code to include that information
     • chunks are numbered starting form zero so N-1 of N is a termination condition
5. Monitoring - FUTURE WORK
   • WFM presents list of active observation workflows
   • possibility to monitor workflow
   • possibility to stop workflow execution
   • we agreed to implement that in EXPReS 2
6. Action items
   • make all the changes and generate new WSDL file by April 24th [Dominik] [DONE]
     • all the changes has been incorporated
     • new WSDL files have been generated for all services, see page Communication Protocol
   • update all services and deploy them on Huygens by April 24th [Dominik]
   • update TN service by April ?? [Des]