Beyond top: Command-Line Monitoring on the JVM (ClojureRemote)

Transcript

1. Beyond top(1) Command-Line Monitoring on the JVM Colin Jones @trptcolin 8th Light
2. command-line tooling
3. introspection & serviceability on the JVM
4. war stories
5. A long time ago in a startup far, far away…
6. Things are going pretty well
7. But strange things are afoot
8. the server sometimes gets really slow
9. the team has to manually restart the application server
10. Pain, frustration, anger
11. Just the facts
12. sometimes, things get slow
13. all requests seem to be affected
14. the JVM stays up
15. restart the JVM and everything is fine
16. What could it be?
17. Demo
18. More facts!
19. what application code was running
20. constant full GCs
21. what’s in the heap
22. What could it be?
25. Mystery solved!
26. Now “just” fix it
27. idea 1: eliminate the leak
28. idea 2: eliminate the cache altogether?
29. idea 3: delete the feature
30. idea 4: re-think the problem
31. So we’re good, for now…
32. Lessons
33. “it’s slow” could mean lots of things
34. “high CPU” could mean lots of things
35. collecting data is crucial in a crisis
36. reproducing the issue helps me sleep at night
37. The right tools for the job
38. Other “right tools for the job”
39. Learning more
40. Books Books!
41. operators are standing by!
42. Thank you! Colin Jones @trptcolin