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Beyond top(1) Command-Line Monitoring on the JVM Colin Jones @trptcolin 8th Light
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command-line tooling
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introspection & serviceability on the JVM
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war stories
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A long time ago in a startup far, far away…
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Things are going pretty well
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But strange things are afoot
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the server sometimes gets really slow
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the team has to manually restart the application server
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Pain, frustration, anger
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Just the facts
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sometimes, things get slow
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all requests seem to be affected
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the JVM stays up
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restart the JVM and everything is fine
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What could it be?
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Demo
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More facts!
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what application code was running
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constant full GCs
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what’s in the heap
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What could it be?
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No content
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No content
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Mystery solved!
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Now “just” fix it
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idea 1: eliminate the leak
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idea 2: eliminate the cache altogether?
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idea 3: delete the feature
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idea 4: re-think the problem
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So we’re good, for now…
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Lessons
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“it’s slow” could mean lots of things
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“high CPU” could mean lots of things
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collecting data is crucial in a crisis
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reproducing the issue helps me sleep at night
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The right tools for the job
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Other “right tools for the job”
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Learning more
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Books Books!
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operators are standing by!
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Thank you! Colin Jones @trptcolin