Marcus Hirt

Lessons learnt when using JFR at scale.

The JDK Flight Recorder (JFR) was open sourced with JDK 11, and was subsequently back-ported to JDK 8u262. JFR allows for always-on production time profiling, with little overhead and with a rich set of data. This talk will discuss things to consider when using JFR to profile hundreds of thousands of JVMs in mission critical systems all over the world. We will discuss trade-offs, limits, work-arounds and insights we’ve learnt as we’ve developed the Java profiling capabilities at Datadog.

Recently open sourced, JDK Mission Control is the industry standard tool for Java performance analysis in production environments. This presentation will introduce the tool and explain how to use it to solve various production time problems with very little overhead.

We will also discuss how application developers can extend their applications to take advantage of the event recording capabilities of the JDK Flight Recorder, now included in OpenJDK 11, and how to create custom tools based on the extensive Mission Control API to analyse specific issues beyond what is offered by default by the Eclipse based tool.

At the end a demo will be shown using the JDK Flight Recorder, JDK Mission Control and OpenTracing together to facilitate deep distributed tracing capabilities.