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jvm debugging (memory (-XX:+HeapDumpOnOutOfMemoryError gives heap and…
jvm debugging
memory
-XX:+HeapDumpOnOutOfMemoryError
gives heap and thread dump
ask ops to reduce heap on a node,
your laptop may not have the mem to reproduce
smaller file to transport
shallow (single entity)
retained (full graph)
https://www.yourkit.com/
Java agent, vm needs to start with the agent
Java 8 Metaspace can grow unbounded by default
thread dump
capture
jstack
kill -3 PID
interpret
tda - thread dump analyzer
identify app code
look for waiting threads
running jvm
JConsole
memory
threads
mbeans
jvm details
monitoring
jvisualvm
ships with JDK
/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/bin
heap dump analysis