JDK Flight Recorder: Difference between revisions

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{{short description|Production time profiling and diagnostics for OpenJDK}}

{{Cleanup AfD|date=July 2021}}{{More references needed|date=July 2021}}

'''JDK Flight Recorder''' is an event recorder built into the OpenJDK <ref>{{cite web |title=OpenJDK |url=https://openjdk.org/| accessdate=28 June 2023}}</ref> [[Java virtual machine]]. It can be thought of as the software equivalent of a Data Flight Recorder (Black Box) in a commercial aircraft. It captures information about the [[Java virtual machine|JVM]] itself, and the application running in the JVM. There is a wide variety of data captured, for example method profiling, allocation profiling and garbage collection related events. The '''JDK Flight Recorder''' was designed to minimize the [[Observer effect (information technology)|Observer Effect]] in the profiled system, and is meant to be always on in production systems. The technology was open sourced in 2018.

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==History==

JDK Flight Recorder started out as JRockit Flight Recorder, and was originally used as a means to collect data to be used to improve the JVM itself.<ref>{{cite web |title=JRockit Flight Recorder Runtime Guide |url=https://docs.oracle.com/cd/E15289_01/JRMCF/E15070-10.pdf |accessdate=22 January 2019}}</ref><ref>{{cite book |title=Oracle JRockit: the Definitive Guide |year=2010 |publisher=Packt Pub |isbn=978-1847198068 |pages=588 }}</ref> After Oracle acquired [[Sun Microsystems]], JRockit Flight Recorder was rebranded Java Flight Recorder.<ref>{{cite web |title=Java Flight Recorder Runtime Guide |url=https://docs.oracle.com/javacomponents/jmc-5-4/jfr-runtime-guide/about.htm#JFRUH170 |accessdate=22 January 2019}}</ref> In 2018 Java Flight Recorder was open sourced and released as part of [[OpenJDK]] 11.<ref>{{cite web |title=JEP 328: Flight Recorder |url=https://openjdk.java.net/jeps/328 |accessdate=22 January 2019}}</ref> When open sourced it was rebranded JDK Flight Recorder, due to Java trademark issues.

==Versions==

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==DevlopmentDevelopment==

The development of JDK Flight Recorder is taking place as part of the OpenJDK JDK <ref>{{cite web |title=OpenJDK JDK Project |url=https://openjdk.org/projects/jdk/| accessdate=28 June 2023}}</ref> project on GitHub ,<ref>{{cite web |title=GitHub OpenJDK JDK |website=[[GitHub]] |url=https://github.com/openjdk/jdk| accessdate=28 June 2023}}</ref>, although most of the public discussions are taking place on the OpenJDK hotspot-jfr-dev <ref>{{cite web |title=hotspot-jfr-dev mailing list |url=https://mail.openjdk.org/pipermail/hotspot-jfr-dev/| accessdate=28 June 2023}}</ref> [[mailing list]].

==See also==

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[[Category:Java (programming language) software]]

[[Category:Free softwarecomputer programming tools]]