Comments (3)
Hello! It's certainly not expected. They should be up as long as they are running. One possible culprit is this: online / offline messages don't depend on actual mutual communication being open; but rather depend on health checks and status updates. So every 2 or 3 seconds, components fire hello
messages, saying that they are online. And if a component didn't receive a hello
message from another component, it marks the latter as "offline". When they receive it; they mark them as "online".
So it might be that you changed these defaults, or your network has problems with multicast / broadcast (unlikely). One other problem is, if you have very high CPU load, or if you have a lot of synchronous operations, you may prevent the occurance of these hello
messages. If you have a synchronous loop that runs for 4 seconds, for example, you will certainly miss a hello
message. So it's natural for other components to mark this component as offline
.
For the second point, I didn't know it was a case. I shall look into it and fix it.
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Interesting. Thanks for the info. Maybe it has something to do with the way the requesters are being initialized in the app (it's built on Loopback - the requester is set up when a mixin is applied to a model. The responder is launched by PM2 separately). I'll try refactoring some stuff and see if it changes anything. Regardless, the messaging still works, a responder will still pick up a request, even though the statuses are flapping. Maybe that's just luck though.
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Well, cote is built exactly for this specific purpose; high-availability. As long as the requester doesn't die; you won't lose any messages, even if you have unstable responders.
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Related Issues (20)
- No namespace and a strange "type" for Requester and Responder instances HOT 7
- Subscriber binding a socket instead of connecting (client vs server) ?
- Round-robin mechanism leads to lost requests HOT 4
- Client lost data when service graceful shutdown
- cote.js actively maintained? HOT 2
- Support specific ip addresses of instances. HOT 8
- Using cotejs on k3s cluster HOT 2
- K3S Kubernetes Cluster: TypeError [ERR_INVALID_ARG_TYPE]: The "options.port" property must be one of type number or string. Received null HOT 8
- Invalid 'main' field - node-discover HOT 2
- hiredis dependency preventing using node versions > 10? HOT 3
- [QUESTION] Are broadcasts mandatory? HOT 3
- Remove hiredis dependency HOT 2
- Discovery not working HOT 2
- How can I allow anyone over the Internet to run replicas of a service? HOT 1
- Cote not working with AWS Autoscalling instances. HOT 3
- Select port used
- Can't start cote due to port issue HOT 2
- View IP address of incoming request/broadcast HOT 1
- Hide "no listeners found for event" log HOT 2
- Requester can see the Responder but dont send request to it HOT 1
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