Hystrix Warstories

Hystrix Warstories slides from our talk @ JAX 2016

1. Hystrix Warstories_ Benjamin Wilms, Felix Braun
2. 2 Agenda
3. 3 Agenda Hystrix Einführung Resilience Patterns Praxis 1: Hystrix Erfahrungen Demo Praxis 2: Hystrix und Legacy Backends Advanced Features
4. 4 About us Benjamin Wilms Felix Braun Senior Agile IT-Consultant www.codecentric.de blog.codecentric.de Senior IT-Consultant
5. 5 Hystrix Introduction
7. 7 99,99 %
8. 8 Bei 30 abhängigen µServices: 99,7 %
9. 9 2 Stunden und 15 Minuten Downtime pro Monat
10. 10 Welche Features bietet Hystrix?
13. 13 Hello World public class CommandHelloWorld extends HystrixCommand<String> { private final String name; public CommandHelloWorld(String name) { super(HystrixCommandGroupKey.Factory.asKey("ExampleGroup")); this.name = name; } @Override protected String run() { return "Hello " + name; } }
14. 14 Hello World public class CommandHelloWorld extends HystrixCommand<String> { [...] @Override protected String run() { return getLocalizedHello(name); } @Override protected String getFallback(){ return "Hello " + name; } }
15. 15 8 Resilience Patterns
16. 16 Pattern • Timeout (Hystrix) • Bulkheads (Hystrix) • Circuit Breaker (Hystrix) • Steady State • Fail Fast • Handshaking • Test harness • Decoupling middleware
17. 17 Real World #1
18. 18 “Architektur”
19. 19 Gewonnene Erfahrungen
20. 20 Funktioniert
21. 21 Gewonnene Erfahrung Laufzeit- Konfiguration
22. 22 Gewonnene Erfahrung Exception Wrapping Flickr: Jessica Spengler
23. 23 Gewonnene Erfahrung Gut geschnitten? Flickr: Roger
24. 24 Gewonnene Erfahrung Viel Schreibarbeit….
25. 25 Java 8 new LambdaHystrixCmd<> ("PingCmd",() -> getPing(), () -> "pong");
26. 26 Java 8 public class LambdaHystrixCommand<T> extends HystrixCommand<T> { private Supplier<T> runSupplier; private Supplier<T> fallbackSupplier; public LambdaHystrixCommand(String cmdkey, Supplier<T> runSup, Supplier<T> fallbackSup) { [...] } @Override protected T run() throws Exception { return runSupplier.get();} @Override protected T getFallback() { return fallbackSupplier.get();} }
27. 27 Annotationsbasiert: Spring Cloud / hystrix-javanica @HystrixCommand(fallbackMethod=“defaultUser“) public User getUserById(String id) { return userResource.getUserById(id); }
28. 28 Integration Day
29. 29 Integration Day
30. 30 Hystrix Dashboard
31. 31 Quo Vadis Hystrix Dashboard?
32. 32 Hystrix Dashboard
33. 33 New Visualization at Netflix
34. 34 Real World #2
35. 35 24/7 Kundenportal Flickr: Jessica Spengler
36. 36 geplante Ausfallzeiten
37. 37 ungeplante Ausfallzeiten
38. 38 Legacy Backend via Hystrix
39. 39 Demo-Anwendung
40. 40 Sender & Receiver Transport (SRT)
41. 41 Demo-Architektur
42. 42 Demo-Architektur
43. 43 Hystrix & Archaius
44. 44 Hystrix & Archaius • dynamic & typed • thread safe • polling framework • callback mechanism • dynamic configuration
45. 45 Hystrix & Archaius • AWS Dynamo DB • Apache ZooKeeper • CoreOS etcd
46. 46 CoreOS etcd • Distributed key value store • REST API • Cluster ready
47. 47 Architektur
48. 48 Archaius & etcd // Config fallback (config.properties) and Etcd configuration compositeConfig = new ConcurrentCompositeConfiguration(); ClasspathPropertiesConfiguration.initialize(); // File based config // CoreOS Etcd service configuration etcdConfigSource = new EtcdConfigurationSource(etcd, "/hystrix/"); etcdConfig = new DynamicWatchedConfiguration(etcdConfigSource); compositeConfig.addConfiguration(etcdConfig,"etcd dynamic override config"); ConfigurationManager.install(compositeConfig);
49. 49 Chaos Monkey
50. 50 Chaos Monkey
51. 51 Simian Army
52. 52 Archaius & etcd Timeouts Exceptions
53. 53 Archaius & etcd curl -L -X PUT http://etcd:2379/v2/keys/hystrix/chaos.monkey.active -d value=true
54. 54 Archaius & etcd DynamicBooleanProperty chaosMonkeyActive = DynamicPropertyFactory.getInstance(). getBooleanProperty("chaos.monkey.active", false); chaosMonkeyActive.get();
55. 55 Demo Hystrix Configuration via etcd
56. 56 Spring Cloud Netflix & Spring Boot @SpringBootApplication @EnableCircuitBreaker @EnableHystrixDashboard @Import(ArchaiusConfiguration.class) public class TransportServiceAppl { public static void main(String[] args) { SpringApplication.run(TransportServiceApp.class, args); } }
57. 57 new HystrixCmd<>(“DemoCmd", () -> showLiveDemo(), () -> showFallbackVideo() );
58. 58 Demo Zusammenfassung
59. 59 Zusammenfassung • Chaos Monkey aktiviert • Remote Services konfiguriert • Hystrix Timeouts gesetzt • Hystrix Circuit Breaker open/close • Hystrix Fallbacks deaktiviert
60. 60 Advanced Features
61. 61 Request Collapsing
62. 62 Request Caching
63. 63 Request Caching • Caching auf Request-Ebene (HystrixRequestContext) • Aktiviert durch implementieren von HystrixCommand.getCacheKey()
64. 64 Cache-Example @GET @Path("/cacheTest/{name}") public void cacheTest(@PathParam("name") String name) { try (HystrixRequestContext context = HystrixRequestContext.initializeContext()) { for (int i = 0; i < 3; i++) { LambdaHystrixCommand<String> pingCmd = new LambdaHystrixCommand<>( „CacheCmd", „CacheCmdCache",() -> getPing(name), () -> "pong"); String result = pingCmd.execute(); System.out.println(i + ": " + result + " is from cache: " + pingCmd.isResponseFromCache()); }} }
65. 65 Cache-Example @GET @Path("/cacheTest/{name}") public void cacheTest(@PathParam("name") String name) { try (HystrixRequestContext context = HystrixRequestContext.initializeContext()) { for (int i = 0; i < 3; i++) { LambdaHystrixCommand<String> pingCmd = new LambdaHystrixCommand<>( „CacheCmd", „CacheCmdCache",() -> getPing(name), () -> "pong"); String result = pingCmd.execute(); System.out.println(i + ": " + result + " is from cache: " + pingCmd.isResponseFromCache()); }} }
66. 66 Cache-Example @GET @Path("/cacheTest/{name}") public void cacheTest(@PathParam("name") String name) { try (HystrixRequestContext context = HystrixRequestContext.initializeContext()) { for (int i = 0; i < 3; i++) { LambdaHystrixCommand<String> pingCmd = new LambdaHystrixCommand<>( „CacheCmd", „CacheCmdCache",() -> getPing(name), () -> "pong"); String result = pingCmd.execute(); System.out.println(i + ": " + result + " is from cache: " + pingCmd.isResponseFromCache()); }} }
67. 67 GitHub Demo-Projekt unter: github.com/MrBW/hystrix-warstories-applications
68. 68 Danke. Fragen?