Message Tracing by metric log #34
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knolleary
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Jul 23, 2020
designs/message-trace/README.md
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| - msg: message in process. For example, when join node send a concatenated message, use the message as an argument of `node.metric()`. | ||
| - relatedMsgIds: array of ids of related messages. | ||
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| Note: we can put more complex information on the third argument of `node.metric()`. For example, we can make it a object which contains a array of message ids and a relation type such as `"isPartOf"`, `"splitInto"`, `"isDependsOn"`, etc. |
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I think we need to decide if it's going to be a more complex object from the start - it isn't something we can change later.
In the Join node scenario, which is the main scenario that requires this correlate metric, I would suggest it looks like:
{ "join":["A", "B", "C" ...]}
That gives us room to introduce other correlate messages if they prove necessary.
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Updated according to comment #34 (comment).
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This design note proposes extension of metric log so that we can trace messages.
Part of message trace function can be implemented in 'Pluggable Message Routing', but runtime can't recognize a relationship between messages (e.g. in join node, runtime can't know which messages are combined into another message).