What is the `rpctype` `userDefined`?

[jfloff]

For the Microservices 2021 dataset, in the MS_CallGraph_Table there are 5 different types on the rpctype column:

• rpc : rpc caller
• http: http caller
• db: database calls
• mc: memcache calls
• mq: I assume its message queue calls (although not stated anywhere)
• userDefined: ?

Could you give more details on this last column?

Thank you,

[niewuya]

Thanks for your interest and question. You are right about the MQ. We mark the rpctype as "userDefined" if developers adopt their preferred middleware rather than the typical middleware in Alibaba for microservices communication. Therefore, "userDefined" is also one of those five different rpctpyes. I will specify the rpctype of "userDefined" and update traces in the future.