Document Weight predicate

[PadmaGit2]

Hi , i am trying to customize or use any available predicate to use for A/B testing - like for the same route send 10% traffic to destination B and remaining 90% to A

[spencergibb]

There is a Weight predicate (while trying to find the docs, I couldn't, so I'll reuse this issue for that.)

Under spring.cloud.gateway.routes

      - id: weight_high_test
        uri: ${test.uri}
        predicates:
        - Host=**.weighthigh.org
        - Weight=group1, 8
      - id: weight_low_test
        uri: ${test.uri}
        predicates:
        - Host=**.weightlow.org
        - Weight=group1, 2

The weights are calculated per group.

[PadmaGit2]

Thank you Spencer, @spencergibb , I saw something about ThrottleRoutePredicateFactory - is that old? i dont find it in the master branch anymore.

[spencergibb]

It's only a sample.

[PadmaGit2]

@spencergibb - Thank you - I think this works, but I was wondering how this uses the weight - does it take the total # of requests in a day? or an in hour? and splits it into X % to service A and Y% to service B. does it reset the count if I restart the gateway application?

I am using a config server to hold the application.yml and using actuator refresh for gateway to pick it up. I wanted to know how the gateway changes - does it consider the apps in a day or an hour and split?

[spencergibb]

Cherry-picked into 2.1.x via 8c21563

[hariharakumar]

@PadmaGit2 : My use case is similar to yours. Can you tell me about your experience with weight based routing implementation in production? Did you find answers for this part of your question:

I was wondering how this uses the weight - does it take the total # of requests in a day? or an in hour? and splits it into X % to service A and Y% to service B. does it reset the count if I restart the gateway application?

Thanks in advance.

[rishuyadav]

I also have a quite similar use case @hariharakumar @PadmaGit2 , can u please share more about your experience with weight based routing implementation,
also i was facing difficulties in implementing it in configuration java class, i want to make the uri and split percentages dynamic.
Thanks