I Didn't Know JFR Could Do That!
summary
JFR is a mature, high‑precision JVM profiler with about 130 event types, usable as files or a ring buffer (example: ring buffer via maxsize/maxage, store up to 1 GB in memory and dump on demand). Tooling demonstrated: jcmd and JFR CLI for live control, Mission Control for GUIs, the jdk.jfr API for programmatic parsing, and projects like JFL Hacks, jfr‑analytics (Apache Calcite) and Cryostat for automation. True event streaming exists but JFR streaming requires Java 17 and Java 17 adoption sits near 5%, so most deployments use on‑demand, pseudo‑stream, or chunking approaches.
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chapters (12)
- 0:00Introduction and speaker background
- 1:27What is JFR and why use it
- 4:14JFR history and maturity
- 9:09Cloud native and observability need
- 13:37Starting JFR with flags and commands
- 17:59Live demo of JFR with JFR command
- 22:30Mission Control and JFR files
- 29:48JFR programmatic API and parsing
- 36:16JFR Analytics and event handling
- 40:54Automated JFR for observability
- 43:03JFR streaming and future trends
- 45:11Conclusion and Q&A
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