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APEL/MessagingProtocol
Accounting Messaging Protocol
Background
It has been agreed within EMI and EGI to use messaging for transporting accounting data. The APEL team developed software (called SSM) for use with messaging, and although it can be used independently of the message format, it uses a somewhat complex message sequence on top of the STOMP protocol, so it is not easy for other software to interact.
We will discuss ways to simplify the protocol so that it is simple for different accounting software to interact.
We won't consider the message content here - that is covered by the definition of the Compute Accounting Record (CAR): see https://twiki.cern.ch/twiki/bin/view/EMI/ComputeAccounting.
The current protocol
[This document https://wiki.egi.eu/w/images/8/85/SSM_Messaging_Protocol.pdf] documents the current protocol used by SSM.