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1. Introduction

In this tutorial, we'll explore Pinpoint, an open-source APM (Application Performance Management) software with excellent capabilities.

First, we’ll see its basic architecture and the fundamentals of its working parts. Then, we’ll look at a working example of live performance monitoring.

2. Architecture of Pinpoint

Let's look at the architecture of Pinpoint:

From this diagram, we can identify four main components:

  • Pinpoint Collector: the web application that collects data on the configured applications
  • HBase Storage: the non-relational open-source database where Pinpoint stores data
  • Pinpoint Web UI: the front end of the software
  • Pinpoint Agent: the JVM Agent that sends the profile data of our application to the Pinpoint Collector

The Pinpoint Collector is the pulsating heart of the software. It can collect data in two different ways. The first is by gathering data explicitly – applications call Pinpoint APIs directly in this case. The second one is automatic, relying on byte code instrumentation, which means that Pinpoint is modifying application code at class loading time, adding TCP/UDP network calls to the collector.

3. Running Example

Let’s now run a quickstart example using an already-composed Pinpoint application environment using docker-compose:

$ git clone https://github.com/pinpoint-apm/pinpoint-docker.git
$ cd pinpoint-docker
$ docker-compose pull && docker-compose up -d

The last command can take some time to execute as it downloads and then brings up all the environments attached to the Pinpoint quickstart showcase.

Looking at the started containers at the end of the run, we see some additional components that are part of the infrastructure:

  • Pinpoint-QuickStart: the sample Tomcat-based application we are monitoring
  • Pinpoint-Flink: enables the Application Inspector, used to inspect the resources of the Application
  • Pinpoint-Zookeeper: just an example of using a Zookeeper image with Pinpoint
  • Pinpoint-Mysql and Pinpoint-Batch: used to set Alarms

Let’s now hit some endpoints of the sample application, so that the APM has some metrics to track. At the address http://localhost:8085 we'll be prompted with a list of endpoints we can call. For this demo, let’s make three HTTP requests by clicking these relative links:

  • callSelf/getCurrentTimestamp
  • callSelf/httpclient4/getGeoCode
  • consumeCpu

3.1. Web Client

Let’s now access the web client, at the address http://localhost:8080. Here, when we choose the “quickapp” application from the Application List, we'll see this webpage:

 

We can see clearly that we made three web requests, two that were resolved by the application itself, and one that went to an external service at maps.googleapis.com.

Furthermore, we can see from the color of the circle surrounding the application that one of those requests is considered “slow” because it has spent more than five seconds to finish.

If we now click on “Inspector”, we can see a lot of details about the status of the Java Application, including memory, CPU, and response time:

 

3.2. Pinpoint JVM Agent

We can access detailed information about every request registered by Pinpoint APM. By clicking and dragging the mouse on the Apdex Graph that's present on the homepage, it's possible to select some tracked requests:

 

We then see in a new tab a list of all the various calls registered with detailed information in the Call Tree:

 

Using this graph, we can analyze the complete call stack for every request. This is useful to get visibility of the bottlenecks or slowdowns. It's also great to check the unexpected behavior of external third-party applications.

It's the Pinpoint JVM Agent that makes this detailed stack trace available to users. Let's see how we started the monitored Java application:

pinpoint-quickstart:
   //...
   environment:
      JAVA_OPTS: -javaagent:/pinpoint-agent/pinpoint-bootstrap-${PINPOINT_VERSION}.jar ...

The JAVA_OPS environment variable is added in the docker-compose.yaml configures the JVM-monitored application to start with the Pinpoint Java Agent. The software then automatically and transparently instruments the bytecode to track every invocation during every context switch.

4. Conclusion

In this article, we've looked at Pinpoint APM, an open-source tool that helps us understand our application topology at a glance. We saw how to monitor every transaction in real-time in a non-invasive manner, through JVM agents and an external web collector.

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