k8s java heap dump

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jmap in alphine

• https://github.com/apangin/jattach

apk add --no-cache jattach --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/

jattach 1 dumpheap /tmp/dump.file

remote to local

• https://kubectl.docs.kubernetes.io/pages/container_debugging/copying_container_files.html

kubectl cp /tmp/foo <some-pod>:/tmp/bar -c <specific-container>

kubectl cp -c cp-kafka-connect-server /tmp/dump.file kafka-connect-667469fc95-w55lj:/tmp/dump.file 

visualize dump

• https://visualvm.github.io/download.html

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mongodb kafka connector 분석

• 주요 요소
  • mongdb cursor의 BSON 리스트
  • mongodb kafka connector의 queue
  • kafka connect의 리스트