microservice resiliency - qconsp.com › sp2017 › system › files › presentation-slides ›...
TRANSCRIPT
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MicroserviceResiliency
FromFronttoBackEnd
QConSãoPaulo,2017
LanceBall,SeniorSoftwareEngineer,RedHat
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WhoamI?
SeniorSoftwareEngineer,RedHat
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WhoamI?
SeniorSoftwareEngineer,RedHat
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WhoamI?
SeniorSoftwareEngineer,RedHat
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WhoamI?
SeniorSoftwareEngineer,RedHat
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µService
“ softwareapplicationsassuitesofindependentlydeployableservices
https://martinfowler.com/articles/microservices.html
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µService
“ softwareapplicationsassuitesofindependentlydeployableservices
https://martinfowler.com/articles/microservices.html
Butwhatdoesthismean?!
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What'sinanapplication?
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Stuff
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Monolithicapplication
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Scalingamonolith
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Microserviceapplication
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Scaledmicroservices
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Wait...isn'tthistheUXtrack?
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ServiceLifecycle
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ServiceLifecycle
Clientmakesarequest
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ServiceLifecycle
ClientmakesarequestServerprovidesaresponse
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ServiceLifecycle
ClientmakesarequestServerprovidesaresponseOftenusingHTTPtransport
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ServiceLifecycle
ClientmakesarequestServerprovidesaresponseOftenusingHTTPtransportOftenwithJSONdataformat
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IntheBrowser
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IntheBrowser
XMLHttpRequest
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IntheBrowser
XMLHttpRequestJQuery
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IntheBrowser
XMLHttpRequestJQueryAJAX
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MicroserviceRequests
(simplified)
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OperationalComplexity
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MicroservicesVisualized
https://twitter.com/ThePracticalDev/status/845285541528719360
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Problems
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Problems
Timeouts
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Problems
Timeouts
Networksaturation
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Problems
Timeouts
Networksaturation
Programmererror
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Problems
Timeouts
Networksaturation
Programmererror
Diskfailure
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Problems
Timeouts
Networksaturation
Programmererror
Diskfailure
Transitivedependencies
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Cascadingfailures
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Howtodealwithallthis
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Howtodealwithallthis
Limitsinglepointsoffailure
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Howtodealwithallthis
Limitsinglepointsoffailure
Shedloadwhenpossible
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Howtodealwithallthis
Limitsinglepointsoffailure
Shedloadwhenpossible
Providefallbackbehavior
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Howtodealwithallthis
Limitsinglepointsoffailure
Shedloadwhenpossible
Providefallbackbehavior
Optimizefailurediscovery
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CircuitBreaker
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CircuitBreaker
Callsthatcouldfailarewrapped
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CircuitBreaker
Callsthatcouldfailarewrapped
Circuitopensatafailurethreshold
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CircuitBreaker
Callsthatcouldfailarewrapped
Circuitopensatafailurethreshold
Furthercallsshortcircuitforawhile
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CircuitBreaker
Callsthatcouldfailarewrapped
Circuitopensatafailurethreshold
Furthercallsshortcircuitforawhile
Later,circuittriesagainandtripsimmediatelyifthereisfailure
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CircuitState
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Asyncoperationthatcouldfail
//UseJQuerytogetcartinfo$.get('http://mystore.com/cart').then((json)=>{//updatetheUIwithJSONdata}).catch((e)=>{//oopssomethingwentwrongconsole.error(e);})
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Asyncoperationthatcouldfail
//UseJQuerytogetcartinfo$.get('http://mystore.com/cart').then((json)=>{//updatetheUIwithJSONdata}).catch((e)=>{//oopssomethingwentwrongconsole.error(e);})
Shedloadwhenpossible
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Aside-Promsies
//UseJQuerytogetcartinfo$.get('http://mystore.com/cart').then((json)=>{//updatetheUIwithJSONdata}).catch((e)=>{//oopssomethingwentwrongconsole.error(e);})
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CircuitBreakerExample
//UseJQuery'sajaxwrapperandcircuitbreaker//defaultsforfailurethreshold,timing,etc.constcircuit=circuitBreaker($.get);
circuit.fire('http://nodejs.org/dist/index.json').then((json)=>{//updatetheUIwithJSONdata})//onfailure,justlogtoconsole.catch(console.error);
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CircuitBreakerExample
//UseJQuery'sajaxwrapperandcircuitbreaker//defaultsforfailurethreshold,timing,etc.constcircuit=circuitBreaker($.get);
circuit.fire('http://nodejs.org/dist/index.json').then((json)=>{//updatetheUIwithJSONdata})//onfailure,justlogtoconsole.catch(console.error);
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CircuitBreakerExample
//UseJQuery'sajaxwrapperandcircuitbreaker//defaultsforfailurethreshold,timing,etc.constcircuit=circuitBreaker($.get);
circuit.fire('http://nodejs.org/dist/index.json').then((json)=>{//updatetheUIwithJSONdata})//onfailure,justlogtoconsole.catch(console.error);
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Promisesvs.Callbacks
//WrapNode.js'fs.readFileasapromise-returningfunctionconstreadFile=circuitBreaker.promisify(fs.readFile);
constcircuit=circuitBreaker(readFile,options);
circuit.fire('./package.json','utf-8').then(console.log).catch(console.error);
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CircuitBreakerFallback
Providesdefaultbehaviorincaseoferror
circuit.fallback((file)=>`Sorry,Ican'tread${file}`);
//Fallbackfunctionisstillasuccesscasecircuit.fire('./package.jsob').then((data)=>console.log(`package.json:\n${data}`)).catch((err)=>console.error(`ERR:${err}`));
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CircuitBreakerFallback
Providesdefaultbehaviorincaseoferror
circuit.fallback((file)=>`Sorry,Ican'tread${file}`);
//Fallbackfunctionisstillasuccesscasecircuit.fire('./package.jsob').then((data)=>console.log(`package.json:\n${data}`)).catch((err)=>console.error(`ERR:${err}`));
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Caching
Alwaysreturnsthesamevalue
constnow=circuitBreaker(Date,{cache:true});
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Caching
Alwaysreturnsthesamevalue
constnow=circuitBreaker(Date,{cache:true});
circuit.fire().then(console.log);//MonApr10201712:10:26GMT-0400(EDT)circuit.fire().then(console.log);//MonApr10201712:10:26GMT-0400(EDT)circuit.fire().then(console.log);//MonApr10201712:10:26GMT-0400(EDT)
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Whenisthisuseful?
Frequenthits,infrequentchangeE.g.username
constusername=circuitBreaker(fetchUsername,{cache:true});
//periodicallyclearthecachesetInterval(_=>username.clearCache(),5000);
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Events
Circuitbreakersareeventemitters
//UpdatetheUIspecificallyfortimeouterrorscircuit.on('timeout',()=>$(element).prepend(mkNode(`${route}istakingtoolongtorespond.`)));
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`fire``reject``timeout``success``failure`
`open``close``halfOpen``fallback``snapshot`
Events
Circuitbreakersareeventemitters
//UpdatetheUIspecificallyfortimeouterrorscircuit.on('timeout',()=>$(element).prepend(mkNode(`${route}istakingtoolongtorespond.`)));
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Status
//createa10secwindowwith10bucketsof1secconstcircuit=circuitBreaker(asyncFunc,{rollingCountTimeout:10000,rollingCountBuckets:10});
//statusiscalculatedeverytimestatusisaccessedconststatus=circuit.status
//printtheentirestatisticalwindowconsole.log(status.window);
//printtherollingstatsconsole.log(status.stats);
![Page 62: Microservice Resiliency - qconsp.com › sp2017 › system › files › presentation-slides › lan… · Microservice Resiliency From Front to Back End QCon São Paulo, 2017 Lance](https://reader033.vdocuments.us/reader033/viewer/2022060320/5f0d0be17e708231d4386993/html5/thumbnails/62.jpg)
Status
//createa10secwindowwith10bucketsof1secconstcircuit=circuitBreaker(asyncFunc,{rollingCountTimeout:10000,rollingCountBuckets:10});
//statusiscalculatedeverytimestatusisaccessedconststatus=circuit.status
//printtheentirestatisticalwindowconsole.log(status.window);
//printtherollingstatsconsole.log(status.stats);
![Page 63: Microservice Resiliency - qconsp.com › sp2017 › system › files › presentation-slides › lan… · Microservice Resiliency From Front to Back End QCon São Paulo, 2017 Lance](https://reader033.vdocuments.us/reader033/viewer/2022060320/5f0d0be17e708231d4386993/html5/thumbnails/63.jpg)
Status
//printtherollingstatsconsole.log(status.stats);
//{failures:3,//fallbacks:4,//successes:44,//rejects:4,//fires:48,//timeouts:1,//cacheHits:0,//cacheMisses:0}
![Page 64: Microservice Resiliency - qconsp.com › sp2017 › system › files › presentation-slides › lan… · Microservice Resiliency From Front to Back End QCon São Paulo, 2017 Lance](https://reader033.vdocuments.us/reader033/viewer/2022060320/5f0d0be17e708231d4386993/html5/thumbnails/64.jpg)
Dashboard
http://techblog.netflix.com/2012/12/hystrix-dashboard-and-turbine.html
![Page 65: Microservice Resiliency - qconsp.com › sp2017 › system › files › presentation-slides › lan… · Microservice Resiliency From Front to Back End QCon São Paulo, 2017 Lance](https://reader033.vdocuments.us/reader033/viewer/2022060320/5f0d0be17e708231d4386993/html5/thumbnails/65.jpg)
Demo
![Page 66: Microservice Resiliency - qconsp.com › sp2017 › system › files › presentation-slides › lan… · Microservice Resiliency From Front to Back End QCon São Paulo, 2017 Lance](https://reader033.vdocuments.us/reader033/viewer/2022060320/5f0d0be17e708231d4386993/html5/thumbnails/66.jpg)
Obrigado&Questions
http://lanceball.com/qcon-saopaulo-2017/https://github.com/lance/qcon-saopaulo-2017Twitter-@lanceballGitHub-@lance