Presented by Ingo Richtsmeier

1. Rock the External Task Client
And learn about scalability

2. Use a production environment
• Real database
• Bare metal installation
• Long running tasks

3. The target process

4. Lets start with small steps

5. Two topics in one worker
• Works well
• Topic 1
• Topic 2
// do nothing
try {
Thread.sleep(10000);
} catch (InterruptedException e) {}
// do nothing
try {
Thread.sleep(15000);
} catch (InterruptedException e) {}

6. Lets start with small steps
10 seconds 15 seconds
How long do a lot of instances take?

7. Try spring boot
• Production ready: only
• Works, but
<dependency>
<groupId>org.camunda.bpm.springboot</groupId>
<artifactId>camunda-bpm-spring-boot-starter-webapp-ee</artifactId>
<version>${camundaSpringBoot.version}</version>
</dependency>

8. Try spring boot 2
• Production ready: only
• Works!
• Work on tasks ASAP!
<dependency>
<groupId>org.camunda.bpm.springboot</groupId>
<artifactId>camunda-bpm-spring-boot-starter-rest</artifactId>
<version>${camundaSpringBoot.version}</version>
</dependency>
That‘s Long Polling

9. Secure the REST-API
@Bean
public FilterRegistrationBean<ProcessEngineAuthenticationFilter> myFilterRegistration() {
FilterRegistrationBean<ProcessEngineAuthenticationFilter> registration =
new FilterRegistrationBean<ProcessEngineAuthenticationFilter>();
registration.setFilter(new ProcessEngineAuthenticationFilter());
registration.addUrlPatterns("/rest/*");
registration.addInitParameter("authentication-provider",
"org.camunda.bpm.engine.rest.security.auth.impl.HttpBasicAuthenticationProvider");
registration.setName("camunda-auth");
registration.setOrder(1);
return registration;
}
ExternalTaskClient client = ExternalTaskClient.create()
...
.addInterceptor(new BasicAuthProvider(externalTaskConfig.getUsername(), externalTaskConfig.getPassword()))
...
.build();
Call it with username and password

10. Start a process instance
10 seconds 15 seconds
Every 2 seconds

11. Inspect the access logs
127.0.0.1 - - [19/Sep/2018:22:46:13 +0200] 57 "POST /rest/external-task/fetchAndLock HTTP/1.1" 200 636
127.0.0.1 - - [19/Sep/2018:22:46:23 +0200] 64 "POST /rest/external-task/01615694-bc4d-11e8-a4ea-8c899f49595d/complete HTTP/1.1" 204 -
127.0.0.1 - - [19/Sep/2018:22:46:23 +0200] 39 "POST /rest/external-task/fetchAndLock HTTP/1.1" 200 636
127.0.0.1 - - [19/Sep/2018:22:46:33 +0200] 115 "POST /rest/external-task/0293bc1a-bc4d-11e8-a4ea-8c899f49595d/complete HTTP/1.1" 204 -
127.0.0.1 - - [19/Sep/2018:22:46:33 +0200] 52 "POST /rest/external-task/fetchAndLock HTTP/1.1" 200 636
127.0.0.1 - - [19/Sep/2018:22:46:43 +0200] 58 "POST /rest/external-task/03c1dbe0-bc4d-11e8-a4ea-8c899f49595d/complete HTTP/1.1" 204 -
127.0.0.1 - - [19/Sep/2018:22:46:43 +0200] 40 "POST /rest/external-task/fetchAndLock HTTP/1.1" 200 636
127.0.0.1 - - [19/Sep/2018:22:46:53 +0200] 103 "POST /rest/external-task/04f308e6-bc4d-11e8-a4ea-8c899f49595d/complete HTTP/1.1" 204 -
Milliseonds to answer the request

12. Servers and clients running
Camunda BPM
REST API
Worker 1
Worker 5
Worker 3
Worker 2
Worker 4
MySQL
Camunda BPM
Cockpit
Camunda Optimize

13. Dashboard from Optimize