On Mon, Mar 14, 2016 at 7:41 AM, Lakmal Warusawithana <lak...@wso2.com> wrote:
> Actually even client side circuit breakers are not going to work, if we > fronted micro services via LB. > Cct breakers work within time time windows, and within a time window, if many calls failed, the client side cct breaker should trip, and that would be the correct behavior. > > On Mon, Mar 14, 2016 at 7:18 AM, Lakmal Warusawithana <lak...@wso2.com> > wrote: > >> Hi Azeez, >> >> Without server side circuit breaker, can't we achieve this simply in >> load balancers? See nginx "Passive Health Monitoring". It has implemented >> this into some level. >> >> My point is all these micro services going to be fronted by a load >> balancers and if clients not implementing client side circuit breaker, >> best place to support circuit breakers is in the load balancers. >> >> On Sat, Mar 12, 2016 at 6:16 PM, Afkham Azeez <az...@wso2.com> wrote: >> >>> Isabelle & Sanjiva, >>> >>> http://www.javaworld.com/article/2824163/application-performance/stability-patterns-applied-in-a-restful-architecture.html?page=2 >>> which Aruna had given as a reference explains circuit breaker on the server >>> side. IMO, circuit breaker on both client side & server side are useful >>> features in a microservices framework. In fact these are features people >>> look for when evaluating microservices frameworks. >>> >>> Thanks >>> Azeez >>> >>> On Sat, Mar 12, 2016 at 5:11 PM, Isabelle Mauny <isabe...@wso2.com> >>> wrote: >>> >>>> If an API GW is used to access the microservices , then the circuit >>>> breaker pattern would apply at that level, right ? If the client is a web >>>> app directly calling MS (not that this would be a good pattern at all !) >>>> then the client is the web app. In any case, they are all clients calling >>>> the microservices. So I am not sure about server side either.. >>>> >>>> >>>> ------------------------------------------------------------------------------------- >>>> *Isabelle Mauny* >>>> VP, Product Management - WSO2, Inc. - http://wso2.com/ >>>> >>>> On Sat, Mar 12, 2016 at 8:26 AM, Sanjiva Weerawarana <sanj...@wso2.com> >>>> wrote: >>>> >>>>> I don't understand what server side circuit breaker means. How does >>>>> the server adjust itself? Where's that bit of logic running? >>>>> >>>>> IMO this is not needed in a container world. >>>>> >>>>> On Fri, Mar 11, 2016 at 4:38 PM, Afkham Azeez <az...@wso2.com> wrote: >>>>> >>>>>> Yes, that is client side circuit breaker. What Aruna is implementing >>>>>> is server side circuit breaker. Yes, we need both. >>>>>> >>>>>> On Fri, Mar 11, 2016 at 4:04 PM, Lakmal Warusawithana < >>>>>> lak...@wso2.com> wrote: >>>>>> >>>>>>> Did you looked at [1] >>>>>>> >>>>>>> Netflix Hystrix <https://github.com/Netflix/Hystrix> is an >>>>>>> incredibly useful library for writing code that invokes remote services. >>>>>>> Hystrix times out calls that exceed the specified threshold. It >>>>>>> implements >>>>>>> a *circuit breaker* pattern, which stops the client from waiting >>>>>>> needlessly for an unresponsive service. If the error rate for a service >>>>>>> exceeds a specified threshold, Hystrix trips the circuit breaker and all >>>>>>> requests will fail immediately for a specified period of time. Hystrix >>>>>>> lets >>>>>>> you define a fallback action when a request fails, such as reading from >>>>>>> a >>>>>>> cache or returning a default value. If you are using the JVM you should >>>>>>> definitely consider using Hystrix. >>>>>>> >>>>>>> [1] https://github.com/Netflix/Hystrix >>>>>>> >>>>>>> On Fri, Mar 11, 2016 at 2:42 PM, Aruna Karunarathna <ar...@wso2.com> >>>>>>> wrote: >>>>>>> >>>>>>>> Hi Devs, >>>>>>>> >>>>>>>> *Scenario* >>>>>>>> >>>>>>>> The deployed services in a MSF4J may fail to serve the requests due >>>>>>>> to various factors. e.g, >>>>>>>> 1. Less resources in the server. >>>>>>>> 2. High Load in the server >>>>>>>> 3, Some services take more time to respond etc. >>>>>>>> >>>>>>>> In this kind of a situation, if the server is getting requests >>>>>>>> though there is no resources to serve those requests, and eventually >>>>>>>> the >>>>>>>> server will get unusable. >>>>>>>> >>>>>>>> *Solution* >>>>>>>> >>>>>>>> The Circuit Breaker design pattern can save the server from above >>>>>>>> scenarios, The typical design can be illustrated as in the following >>>>>>>> diagram. >>>>>>>> >>>>>>>> >>>>>>>> So as in the above diagram, when number of failures of a particular >>>>>>>> resource exceeds the Max Failure Count, then the state of that >>>>>>>> resource is >>>>>>>> moved to the open state with a timeout value (Trip Breaker). At this >>>>>>>> point >>>>>>>> the requests coming to the server is routed back without passing the >>>>>>>> internal to process further. >>>>>>>> >>>>>>>> After the timeout has reached, the state is moved to Half-Open >>>>>>>> state, and if the consecutive request pass to the server to process >>>>>>>> (Attempt Reset), if success then close the circuit (Reset Breaker), If >>>>>>>> fail >>>>>>>> then again move the state to the Open with a timeout value (Trip >>>>>>>> Breaker). >>>>>>>> >>>>>>>> Any thoughts, suggestions regarding the above approach? >>>>>>>> >>>>>>>> References >>>>>>>> [1]. >>>>>>>> http://www.javaworld.com/article/2824163/application-performance/stability-patterns-applied-in-a-restful-architecture.html?page=2 >>>>>>>> [2]. >>>>>>>> http://ssagara.blogspot.com/2015/05/timeout-and-circuit-breaker-pattern-in.html >>>>>>>> [3]. https://pragprog.com/book/mnee/release-it >>>>>>>> >>>>>>>> >>>>>>>> Regards, >>>>>>>> Aruna >>>>>>>> -- >>>>>>>> >>>>>>>> *Aruna Sujith Karunarathna * >>>>>>>> WSO2, Inc | lean. enterprise. middleware. >>>>>>>> #20, Palm Grove, Colombo 03, Sri Lanka >>>>>>>> Mobile: +94 71 9040362 | Work: +94 112145345 >>>>>>>> Email: ar...@wso2.com | Web: www.wso2.com >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Architecture mailing list >>>>>>>> Architecture@wso2.org >>>>>>>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Lakmal Warusawithana >>>>>>> Director - Cloud Architecture; WSO2 Inc. >>>>>>> Mobile : +94714289692 >>>>>>> Blog : http://lakmalsview.blogspot.com/ >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> *Afkham Azeez* >>>>>> Director of Architecture; WSO2, Inc.; http://wso2.com >>>>>> Member; Apache Software Foundation; http://www.apache.org/ >>>>>> * <http://www.apache.org/>* >>>>>> *email: **az...@wso2.com* <az...@wso2.com> >>>>>> * cell: +94 77 3320919 <%2B94%2077%203320919>blog: * >>>>>> *http://blog.afkham.org* <http://blog.afkham.org> >>>>>> *twitter: **http://twitter.com/afkham_azeez* >>>>>> <http://twitter.com/afkham_azeez> >>>>>> *linked-in: **http://lk.linkedin.com/in/afkhamazeez >>>>>> <http://lk.linkedin.com/in/afkhamazeez>* >>>>>> >>>>>> *Lean . Enterprise . Middleware* >>>>>> >>>>>> _______________________________________________ >>>>>> Architecture mailing list >>>>>> Architecture@wso2.org >>>>>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Sanjiva Weerawarana, Ph.D. >>>>> Founder, CEO & Chief Architect; WSO2, Inc.; http://wso2.com/ >>>>> email: sanj...@wso2.com; office: (+1 650 745 4499 | +94 11 214 5345) >>>>> x5700; cell: +94 77 787 6880 | +1 408 466 5099; voip: +1 650 265 8311 >>>>> blog: http://sanjiva.weerawarana.org/; twitter: @sanjiva >>>>> Lean . Enterprise . Middleware >>>>> >>>>> _______________________________________________ >>>>> Architecture mailing list >>>>> Architecture@wso2.org >>>>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Architecture mailing list >>>> Architecture@wso2.org >>>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>>> >>>> >>> >>> >>> -- >>> *Afkham Azeez* >>> Director of Architecture; WSO2, Inc.; http://wso2.com >>> Member; Apache Software Foundation; http://www.apache.org/ >>> * <http://www.apache.org/>* >>> *email: **az...@wso2.com* <az...@wso2.com> >>> * cell: +94 77 3320919 <%2B94%2077%203320919>blog: * >>> *http://blog.afkham.org* <http://blog.afkham.org> >>> *twitter: **http://twitter.com/afkham_azeez* >>> <http://twitter.com/afkham_azeez> >>> *linked-in: **http://lk.linkedin.com/in/afkhamazeez >>> <http://lk.linkedin.com/in/afkhamazeez>* >>> >>> *Lean . Enterprise . Middleware* >>> >>> _______________________________________________ >>> Architecture mailing list >>> Architecture@wso2.org >>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>> >>> >> >> >> -- >> Lakmal Warusawithana >> Director - Cloud Architecture; WSO2 Inc. >> Mobile : +94714289692 >> Blog : http://lakmalsview.blogspot.com/ >> >> > > > -- > Lakmal Warusawithana > Director - Cloud Architecture; WSO2 Inc. > Mobile : +94714289692 > Blog : http://lakmalsview.blogspot.com/ > > > _______________________________________________ > Architecture mailing list > Architecture@wso2.org > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- *Afkham Azeez* Director of Architecture; WSO2, Inc.; http://wso2.com Member; Apache Software Foundation; http://www.apache.org/ * <http://www.apache.org/>* *email: **az...@wso2.com* <az...@wso2.com> * cell: +94 77 3320919blog: **http://blog.afkham.org* <http://blog.afkham.org> *twitter: **http://twitter.com/afkham_azeez* <http://twitter.com/afkham_azeez> *linked-in: **http://lk.linkedin.com/in/afkhamazeez <http://lk.linkedin.com/in/afkhamazeez>* *Lean . Enterprise . Middleware*
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