Does Feign retry require some sort of configuration?

Question

I just tried to do a attempted a seamless upgrade of a service in a test setup. The service is being accessed by a Feign client. And naively I was under the impression that with multiple instances available of the service, the client would retry another instance if it failed to connect to one.

That, however, did not happen. But I cannot find any mention of how Feign in Spring Cloud is supposed to be configured to do this? Although I have seen mentions of it supporting it (as opposed to using RestTemplate where you would use something like Spring Retry?)

feign in and of itself doesn't do retry. Are you using ribbon? — spencergibb, Mar 20 '15 at 16:24

score 4 · Accepted Answer · answered Mar 20 '15 at 16:28

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If you are using ribbon you can set properties similar to the following (substituting "localapp" for your serviceid):

localapp.ribbon.MaxAutoRetries=5
localapp.ribbon.MaxAutoRetriesNextServer=5
localapp.ribbon.OkToRetryOnAllOperations=true

answered Mar 20 '15 at 16:28

spencergibb

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Yes I am using Ribbon. But I am still not 100% on where exactly the responsibility domains lie. Setting it for each service seems like a lot of configuration though. Is there a way to set it a default for all users? – Kristoffer Mar 23 '15 at 09:12
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you can drop the service part, so just `ribbon.*` – spencergibb Mar 23 '15 at 15:06
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Really? Well that's a nice tidbit I wasn't aware of. – Kristoffer Mar 23 '15 at 15:09
yup, that's how netflix does the defaults. – spencergibb Mar 23 '15 at 16:09
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Where is the documentation for any of these properties ? – Ben George Mar 03 '17 at 05:23
The netflix/ribbon wiki and http://cloud.spring.io/spring-cloud-static/Camden.SR5/#_retrying_failed_requests – spencergibb Mar 03 '17 at 18:54
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Which errors will be retried? all errors? if the called service return 4XX status, this will also be retried? can i have control over it based on the response? – Roi Ezra Mar 29 '17 at 15:02
Exceptions are retried. There is a `decoded404` flag that will make it not produce an error. – spencergibb Mar 29 '17 at 19:55
@spencergibb, looks like IOExceptions will be retried.. i debugged it and looks like both 400 and 404 are returned as normal response – Roi Ezra Mar 30 '17 at 06:29
@Roi Ezra use ribbon.retryableStatusCodes to choose the status codes for which you wish to retry – Piyush Mar 15 '18 at 13:25

score 2 · Answer 2 · answered Apr 13 '15 at 15:16

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ps underneath Feign has a Retryer interface, which was made to support things like Ribbon.

https://github.com/Netflix/feign/blob/master/core/src/main/java/feign/Retryer.java

answered Apr 13 '15 at 15:16

Adrian Cole

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Adrian, how the feign retyer and the ribbon retry mechnism work together? is there any example or docs about it – Roi Ezra Mar 30 '17 at 06:30

score 1 · Answer 3 · answered Mar 20 '15 at 16:30

see if property works - OkToRetryOnAllOperations: true

You can refer application -> https://github.com/spencergibb/spring-cloud-sandbox/blob/master/spring-cloud-sandbox-sample-frontend/src/main/resources/application.yml

Spencer was quick...was late by few minutes :-)

Does Feign retry require some sort of configuration?

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