Architecture

DMaaP Simulator

DMaap Simulator is a simple Spring Boot application, which exposes two endpoints. First endpoint (@PostMapping("/events/unauthenticated.SEC_FAULT_OUTPUT")) which receives fault events topic and second (@GetMapping("/summary")) which display events count and average processing time in milliseconds(depending on "startEpochMicrosec").

JMeter is generating the current epoch (current time) and updates this field:

Architecture

DMaap Simulator image:

DMaap Simulator supports VES collector in the Frankfurt release.

What is measured

JMeter test results & metrics

• Total Events Sent - total number of events sent by JMeter (including failed requests)
• Failed Requests - total number of failed requests 
• Error Rate % - 'Failed Requests' to 'Total Events Sent' ratio in percentages
• DMaaP - Received Events -  total number of events received by DMaaP on Fault topic
• Total Throughput - number of events sent per second by JMeter
• Total Errors - failed requests per second
• Active Threads - number of active threads per second
• Sync Processing Time (Client → VES) - time measured from sending the request by JMeter to receiving the response by JMeter 
• Async Processing Time (Client → VES → DMaaP) -  time measured from sending the request by JMeter to receiving the event by DMaaP
• RAM Usage - RAM usage of JMeter VM
• CPU Usage - CPU usage of JMeter VM

Ves metrics

• Uptime - how long VES is running
• Start time - when VES has been started
• Heap used - current Heap usage in percentages
• Non-Heap used - current Non-Heap usage in percentages
• Processing time eventListener endpoint - method execution time in VES
• Rate - number of HTTP requests per second
• Duration - maximum and average HTTP request processing time (HTTP request other than 5xx) in milliseconds
• Errors - number of 4xx and 5xx requests per second
• JVM Heap - JVM Heap usage 
  • used - the amount of used memory
  • committed - the amount of memory in bytes that is committed for the Java virtual machine to use
  • max - the maximum amount of memory in bytes that can be used for memory management
• JVM Non-Heap - JVM Non-Heap usage
  • used, committed, max as in JVM Heap 
• JVM Total - JVM Heap + JVM Non-Heap 
  • used, committed, max as in JVM Heap
• CPU Usage - VES CPU usage (Note, that VES can use the whole CPU available on the Worker Node)
  • system - CPU usage for the whole system
  • process - CPU usage for the Java Virtual Machine process
  • process-1h - average CPU usage for the Java Virtual Machine process over 1h
• Load
  • system-1m - number of runnable entities queued to available processors and the number of runnable entities running on the available processors averaged over a period of time
  • cpus - the number of processors available to the Java virtual machine
• Threads 
  • live -  the current number of live threads including both daemon and non-daemon threads
  • daemon - the current number of live daemon threads
  • peak - the peak live thread count since the Java virtual machine started or peak was reset
• Thread States - The current number of threads depending on the state
  
  • runnable
  • blocked
  • waiting
  • timed-waiting
  • new
  • terminated

K8s metrics

• Nodes CPU Usage - current CPU usage on each worker node 
• Nodes RAM Usage - current RAM usage on each worker node
• Nodes Total CPU usage - CPU usage on each node over time
• Network Usage Receive - incoming network traffic on each node in MBs
• Nodes Total RAM Usage - RAM usage on each node over time
• Usage of each core - CPU usage of each core on each worker node
• Network Usage Transmit - outgoing network traffic on each node in MBs

Results

Environment 1

• CPU - 8 cores
• CPU clock speed - 2.4 GHz
• Max Heap - 512 MB
• Start Heap - 256 MB 

Test scenario	Description	JMeter test results & metrics	Ves metrics	K8s metrics
1_test_scenario_6_steps.jmx	6.6RPS → 2.5min 11.6RPS → 2.5min  23.3RPS → 2.5min  33.3RPS → 2.5min 50RPS → 2.5min 66.6RPS → 2.5min
2_test_scenario_1k_rps.jmx	1000RPS → 1s
2_test_scenario_2k_rps.jmx	2000RPS → 1s
2_test_scenario_3k_rps.jmx	3000RPS → 1s
2_test_scenario_4k_rps.jmx	4000RPS → 1s
2_test_scenario_5k_rps.jmx	5000RPS → 1s
custom	11.1RPS → 15min
custom	22.2RPS → 15min
custom	33.3RPS → 15min
custom	44.4RPS → 15min

Environment 2

• CPU - 24 cores
• CPU clock speed - 2.4 GHz
• Max Heap - 512 MB
• Start Heap - 256 MB 

Presentation

Replacing Cambria with DMaaP Client

Presentation

Performance Tests with real DMaaP

Environment 

• CPU - 24 cores
• CPU clock speed - 2.4 GHz
• Max Heap - 512 MB
• Start Heap - 256 MB

Ves with Dmaap client

Ves with Cambria client

Summary test results:

Environment 

• CPU - 24 cores
• CPU clock speed - 2.4 GHz
• Max Heap - 512 MB
• Start Heap - 256 MB

Conclusion:

Results of performance tests for both VES collector client implementation (DMaap client and Cambria client) are very similar.

Max CPU usage, Error rate, Average VES processing time, average and max sync processing time(Client → Ves) are almost the same.

In Ves collector with DMaap client(100RPS for 10 min),  appeared an error with the connection pool. In that specific case, we had a connection poll set to 16 and we got an error that the connection poll limits have been reached (stack trace in attachment).

We have to handle that kind of error in code.