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try passing

-e PULSAR_MEM=-Xmx500M -e PULSAR_GC=-XX:+UseG1GC -e MALLOC_ARENA_MAX=2

in docker parameters and also pass

-nss -nfw

to the command line. for example

docker run --rm -it -p 8080:8080 -p 6650:6650 -e PULSAR_MEM=-Xmx500M -e PULSAR_GC=-XX:+UseG1GC -e MALLOC_ARENA_MAX=2 apachepulsar/pulsar:3.2.0 /pulsar/bin/pulsar standalone -nss -nfw