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Beyond top: Command-Line Monitoring on the JVM ...
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Colin Jones
February 11, 2016
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Transcript
Beyond top(1) Command-Line Monitoring on the JVM Colin Jones @trptcolin
8th Light
command-line tooling
introspection & serviceability on the JVM
war stories
A long time ago in a startup far, far away…
Things are going pretty well
But strange things are afoot
the server sometimes gets really slow
the team has to manually restart the application server
Pain, frustration, anger
Just the facts
sometimes, things get slow
all requests seem to be affected
the JVM stays up
restart the JVM and everything is fine
What could it be?
Demo
More facts!
what application code was running
constant full GCs
what’s in the heap
What could it be?
None
None
Mystery solved!
Now “just” fix it
idea 1: eliminate the leak
idea 2: eliminate the cache altogether?
idea 3: delete the feature
idea 4: re-think the problem
So we’re good, for now…
Lessons
“it’s slow” could mean lots of things
“high CPU” could mean lots of things
collecting data is crucial in a crisis
reproducing the issue helps me sleep at night
The right tools for the job
Other “right tools for the job”
Learning more
Books Books!
operators are standing by!
Thank you! Colin Jones @trptcolin