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YOU’RE GOOD TO GO. Matt Heath - Technical Lead, Platform @mattheath Go London User Group, Sep 2014

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FROM BARCELONA TO BOSTON, FROM TOKYO TO TORONTO.

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eu-west-1 PHP Driver
 API Load Balancer Load Balancer PHP
 Cust
 API PHP Driver
 API Java
 Hailo Engine PHP Driver
 API PHP
 Cust
 API PHP
 Cust
 API MySQL Redis H1 MySQL

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MySQL PHP Driver
 API Java
 Hailo Engine ELB MySQL PHP Driver
 API Java
 Hailo Engine ELB MySQL PHP Driver
 API Java
 Hailo Engine ELB eu-west-1 eu-west-1 us-east-1 PHP
 Cust
 API PHP
 Cust
 API PHP
 Cust
 API PHP
 Cust
 Service PHP
 Credits
 Service Java
 Pay Service ELB C* C* C* H1.5

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CHALLENGES

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DEVELOPING NEW FEATURES UNCLEAR RESPONSIBILITIES SPOFS WITH SLOW FAILOVER LACK OF AUTOMATION

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“construct a highly agile and highly available service from ephemeral and assumed broken components” Adrian Cockcroſt

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Go
 Service Go
 Service Java Service ELB C* C* C* Go “Thin” API RabbitMQ Message Bus
 (federated clusters per AZ) us-east-1 eu-west-1 H2 Go
 Service Go
 Service Java Service ELB C* C* C* Go “Thin” API RabbitMQ Message Bus
 (federated clusters per AZ)

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Logic go-service-layer Storage go-platform-layer Handler Library for building services that talk Protobuf via RMQ Self-configuring external service adapters Services get for free: ! • Provisioning • Service discovery • Configuration • Monitoring • Authentication/authorisation • AB testing • Self configuring connectivity 
 to third-party services H2 Service

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H2

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Provisioning Service Provisioning Service Provisioning Service CI Pipeline (Janky/Jenkins) Amazon S3 Rabbit MQ Provisioning Manager

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Provisioning Service Rabbit MQ Discovery Service Binding
 Service Provisioning Service New
 Service AUTOMATIC SERVICE DISCOVERY

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SMALL INDEPENDENT SERVICES SINGLE RESPONSIBILITY EASE PAIN, SCALE RAPIDLY

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CLOUD NATIVE / ANTIFRAGILE EXPECT FAILURE AUTOMATE EVERYTHING

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POINT IN POLYGONS IN-MEMORY CACHE, ATOMIC RCU UPDATES NON BLOCKING <200µs SEARCH TIME, 4ms ROUND TRIP ZONING SERVICE

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UNIQUE ID GENERATION 77669839702851584 41 bits Timestamp, ms precision, bespoke epoch 10 bits Configured machine ID 12 bits Sequence number

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RAZIEL

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DISTRIBUTED, HA, GEOSPATIAL SEARCH ENGINE INGESTS GPS UPDATES - HIGH WRITE VOLUME LOW LATENCY READS / SEARCHES (<5ms) RAZIEL

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RAZIEL

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INFRASTRUCTURE

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AUTOMATION GO SERVICES GOAMZ

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Environment Service “Meta” environment Compute “Test” environment “Staging” environment “Boop” environment Whisper Service Elastic IP Allocation Autoscaling DNS Configuration Updating Security Groups SNS

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TESTING

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! LOAD FAILURE DEGRADATION

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15,000 JOBS/HOUR 20,000 DRIVERS 4,000+ REQ/S

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CONTINUOUS PRODUCTION TESTING

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TOOLING

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DISTRIBUTED
 TRACING

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hailo~2~api api.v1.customer service.customer hailo~2~api api.v1.customer service.customer

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hailo~2~api api.v1.customer service.customer hailo~2~api api.v1.customer service.customer REQ REP REQ REP IN OUT IN OUT

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{ "timestamp": 1410262798427145176, "traceId": "d30479b8-1491-4390-7cf5-4cd14bc4b765", "type": "OUT", "messageId": "a661f9ef-774c-49b2-6e74-cfed65f7d120", "parentMessageId": "", "from": "com.hailocab.hshell", "to": "com.hailocab.service.nearest-driver.search", "hostname": "ip-10-13-2-251", "az": "eu-west-1a", "handlerInstanceId": “server-com.hailocab.service.nearest-driver-18bd089e-8ef1-4ca1-75cb-8...c”, "duration": 11222094 } { "timestamp": 1410262798416053450, "traceId": "d30479b8-1491-4390-7cf5-4cd14bc4b765", "type": "REQ", "messageId": "6404dd1e-c995-48a9-73dc-9edb1380f0bf", "parentMessageId": "a661f9ef-774c-49b2-6e74-cfed65f7d120", "from": "com.hailocab.service.nearest-driver", "to": "com.hailocab.service.zoning.search", "hostname": "ip-10-13-2-251", "az": "eu-west-1a" }

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hailo~2~api api.v1.customer service.customer REQ RSP REQ RSP IN OUT IN OUT NSQ

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// Req sends a request, and... func (c *Client) Req(req *Request, rsp proto.Message, options ...Options) errors.Error { ! go c.traceReq(req) responseMsg, err := c.doReq(req, options...) go c.traceRsp(req, responseMsg, err) if err != nil { return err } ! // Do other things... ! return nil }

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// instrumentedHandler wraps the handler to provide instrumentation func (ep *Endpoint) instrumentedHandler(req *Request) (proto.Message, errors.Error) { ! start := time.Now() var err errors.Error var msg proto.Message ! // Defer panic handling defer func() { stats.Record(ep, err, time.Since(start)) // oh crap i hope this never happens }() ! // Execute handler go traceIn(req) msg, err = ep.Handler(req) go traceOut(req, msg, err, time.Since(start)) return msg, err }

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// instrumentedHandler wraps the handler to provide instrumentation func (ep *Endpoint) instrumentedHandler(req *Request) (proto.Message, errors.Error) { ! start := time.Now() var err errors.Error var msg proto.Message ! // Defer panic handling defer func() { stats.Record(ep, err, time.Since(start)) // oh crap i hope this never happens }() ! // Execute handler go traceIn(req) // Don’t actually do this msg, err = ep.Handler(req) go traceOut(req, msg, err, time.Since(start)) return msg, err }

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Phosphor Host Instances Publish Service A Trace Library goroutine chan UDP Service B Trace Library goroutine chan UDP Trace Service In-memory Aggregates Optional
 persistant storage Dashboards Monitoring

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Phosphor Host Instances Publish Service A Trace Library goroutine chan UDP Service B Trace Library goroutine chan UDP Trace Service In-memory Aggregates Optional
 persistant storage Dashboards Monitoring

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var traceChan chan []byte ! func init() { // Use a buffered channel traceChan = make(chan []byte, 200) ! // Fire off a background worker for this channel defaultClient = NewClient(traceChan) go defaultClient.publisher() } ! // Send, drops trace if the backend is at capacity func Send(msg []byte) { select { case traceChan <- msg: // Success default: // Default case fired if channel is full // Ensures this is non blocking } }

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Phosphor Trace Service Host Instances Publish Service A Trace Library goroutine chan UDP Service B Trace Library goroutine chan UDP In-memory Aggregates Optional
 persistant storage Dashboards Monitoring

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func (w *worker) loop() { var b []byte ! // Spin and forward on traces every time our // buffer fills, or when our time window elapses for { select { case b = <-w.ch: w.buf = append(w.buf, b) if len(w.buf) >= bufferSize { w.send() } case <-time.Tick(bufferWindow): w.send() } } }

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func (w *worker) loop() { var b []byte ! // Spin and forward on traces every time our // buffer fills, or when our time window elapses for { select { case b = <-w.ch: w.buf = append(w.buf, b) if len(w.buf) >= bufferSize { w.send() } case <-time.Tick(bufferWindow): // Leaks goroutines w.send() } } }

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func (w *worker) loop() { var b []byte timeout := time.Tick(bufferWindow) ! // Spin and forward on traces every time our // buffer fills, or when our time window elapses for { select { case b = <-w.ch: w.buf = append(w.buf, b) if len(w.buf) >= bufferSize { w.send() } case <-timeout: w.send() } } }

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func (w *worker) loop() { var b []byte timeout := time.NewTicker(bufferWindow) defer timeout.Stop() // Bonus points ! // Spin and forward on traces every time our // buffer fills, or when our time window elapses for { select { case b = <-w.ch: w.buf = append(w.buf, b) if len(w.buf) >= bufferSize { w.send() } case <-timeout.C: w.send() } } }

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Tracing: 33eda743-f124-435c-71fc-3c872bbc98e6 ! 2014-09-07 02:20:19.867 [/] [START] → - 2014-09-07 02:20:19.867 [eu-west-1a/ip-10-11-3-51] [REQ] com.hailocab.hailo-2-api → com.hailocab.api.v1.customer.neardrivers - 2014-09-07 02:20:19.867 [eu-west-1a/ip-10-11-2-203] [IN] com.hailocab.hailo-2-api → com.hailocab.api.v1.customer.neardrivers - 2014-09-07 02:20:19.868 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.feature-flags.features - 2014-09-07 02:20:19.869 [eu-west-1a/ip-10-11-3-111] [IN] com.hailocab.api.v1.customer → com.hailocab.service.feature-flags.features - 2014-09-07 02:20:19.876 [eu-west-1a/ip-10-11-3-111] [REQ] com.hailocab.service.feature-flags → com.hailocab.service.hob.list - 2014-09-07 02:20:19.877 [eu-west-1a/ip-10-11-3-168] [IN] com.hailocab.service.hob → com.hailocab.service.config.compile - 2014-09-07 02:20:19.877 [eu-west-1a/ip-10-11-3-111] [IN] com.hailocab.service.feature-flags → com.hailocab.service.hob.list - 2014-09-07 02:20:19.877 [eu-west-1a/ip-10-11-3-111] [REQ] com.hailocab.service.hob → com.hailocab.service.config.compile - 2014-09-07 02:20:19.883 [eu-west-1a/ip-10-11-3-168] [OUT] com.hailocab.service.hob → com.hailocab.service.config.compile - 5.59 ms 2014-09-07 02:20:19.886 [eu-west-1a/ip-10-11-3-111] [REP] com.hailocab.service.hob → com.hailocab.service.config.compile - 8.40 ms 2014-09-07 02:20:19.887 [eu-west-1a/ip-10-11-3-111] [OUT] com.hailocab.service.feature-flags → com.hailocab.service.hob.list - 9.72 ms 2014-09-07 02:20:19.889 [eu-west-1a/ip-10-11-3-111] [REP] com.hailocab.service.feature-flags → com.hailocab.service.hob.list - 13.23 ms 2014-09-07 02:20:19.889 [eu-west-1a/ip-10-11-3-111] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.feature-flags.features - 20.58 ms 2014-09-07 02:20:19.890 [eu-west-1a/ip-10-11-2-203] [REP] com.hailocab.api.v1.customer → com.hailocab.service.feature-flags.features - 22.59 ms 2014-09-07 02:20:19.902 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.903 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.903 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.904 [eu-west-1a/ip-10-11-3-111] [IN] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.904 [eu-west-1a/ip-10-11-3-111] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 0.36 ms 2014-09-07 02:20:19.905 [eu-west-1a/ip-10-11-2-203] [REP] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 1.97 ms 2014-09-07 02:20:19.905 [eu-west-1a/ip-10-11-2-214] [IN] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.905 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.nearest-driver.search - 2014-09-07 02:20:19.905 [eu-west-1a/ip-10-11-2-214] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 0.10 ms
 ERR - com.hailocab.service.fare.basefare: Missing config at xxx 2014-09-07 02:20:19.906 [eu-west-1a/ip-10-11-2-214] [IN] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 2014-09-07 02:20:19.906 [eu-west-1a/ip-10-11-2-214] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.fare.basefare - 0.06 ms 
 ERR - com.hailocab.service.fare.basefare: Missing config at xxx 2014-09-07 02:20:19.907 [eu-west-1a/ip-10-11-3-58] [IN] com.hailocab.api.v1.customer → com.hailocab.service.nearest-driver.search - 2014-09-07 02:20:19.907 [eu-west-1a/ip-10-11-3-58] [REQ] com.hailocab.service.nearest-driver → com.hailocab.service.zoning.search - 2014-09-07 02:20:19.908 [eu-west-1a/ip-10-11-3-58] [IN] com.hailocab.service.nearest-driver → com.hailocab.service.zoning.search - 2014-09-07 02:20:19.908 [eu-west-1a/ip-10-11-3-58] [OUT] com.hailocab.service.nearest-driver → com.hailocab.service.zoning.search - 0.20 ms 2014-09-07 02:20:19.909 [eu-west-1a/ip-10-11-3-58] [REP] com.hailocab.service.nearest-driver → com.hailocab.service.zoning.search - 2.25 ms 2014-09-07 02:20:19.909 [eu-west-1a/ip-10-11-3-58] [REQ] com.hailocab.service.nearest-driver → com.hailocab.service.raziel.multisearch - 2014-09-07 02:20:19.912 [eu-west-1a/ip-10-11-3-227] [IN] com.hailocab.service.nearest-driver → com.hailocab.service.raziel.multisearch - 2014-09-07 02:20:19.919 [eu-west-1a/ip-10-11-3-58] [REP] com.hailocab.service.nearest-driver → com.hailocab.service.raziel.multisearch - 9.46 ms 2014-09-07 02:20:19.919 [eu-west-1a/ip-10-11-3-58] [REQ] com.hailocab.service.nearest-driver → com.hailocab.service.eta.multitraveltime - 2014-09-07 02:20:19.919 [eu-west-1a/ip-10-11-3-227] [OUT] com.hailocab.service.nearest-driver → com.hailocab.service.raziel.multisearch - 7.58 ms 2014-09-07 02:20:19.920 [eu-west-1a/ip-10-11-3-58] [IN] com.hailocab.service.nearest-driver → com.hailocab.service.eta.multitraveltime - 2014-09-07 02:20:19.920 [eu-west-1a/ip-10-11-3-58] [OUT] com.hailocab.service.nearest-driver → com.hailocab.service.eta.multitraveltime - 0.06 ms 2014-09-07 02:20:19.921 [eu-west-1a/ip-10-11-3-58] [REP] com.hailocab.service.nearest-driver → com.hailocab.service.eta.multitraveltime - 1.77 ms 2014-09-07 02:20:19.921 [eu-west-1a/ip-10-11-3-58] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.nearest-driver.search - 14.02 ms 2014-09-07 02:20:19.921 [eu-west-1a/ip-10-11-2-203] [REP] com.hailocab.api.v1.customer → com.hailocab.service.nearest-driver.search - 15.48 ms 2014-09-07 02:20:19.941 [eu-west-1a/ip-10-11-2-203] [REQ] com.hailocab.api.v1.customer → com.hailocab.service.experiment.readlastupdated - 2014-09-07 02:20:19.945 [eu-west-1a/ip-10-11-2-214] [IN] com.hailocab.api.v1.customer → com.hailocab.service.experiment.readlastupdated - 2014-09-07 02:20:19.947 [eu-west-1a/ip-10-11-2-214] [OUT] com.hailocab.api.v1.customer → com.hailocab.service.experiment.readlastupdated - 1.82 ms 2014-09-07 02:20:19.947 [eu-west-1a/ip-10-11-2-203] [REP] com.hailocab.api.v1.customer → com.hailocab.service.experiment.readlastupdated - 6.01 ms 2014-09-07 02:20:19.948 [eu-west-1a/ip-10-11-2-203] [OUT] com.hailocab.hailo-2-api → com.hailocab.api.v1.customer.neardrivers - 80.46 ms 2014-09-07 02:20:19.950 [eu-west-1a/ip-10-11-3-51] [REP] com.hailocab.hailo-2-api → com.hailocab.api.v1.customer.neardrivers - 82.71 ms

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SO, GO?

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SMALL, SIMPLE EASY TO READ & LEARN CONCURRENCY DEPLOYMENT

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STILL LEARNING 3RD PARTY LIBRARY SUPPORT PACKAGE MANAGEMENT

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NEXT?

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TOOLING, TESTING, AUTOMATION, SCHEDULING, DOCKER, KUBERNETES

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THANKS! PS. We’re hiring! Go London User Group, Sep 2014

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IMAGE CREDITS HMS President: Chris Wainwright Clouds: sweetydarkdream.deviantart.com Orbital Ion Cannon: www.rom.ac Go Gophers: Renee French !