Github user shroman commented on the issue:
https://github.com/apache/incubator-rocketmq/pull/87
@dongeforever I see, thank you!
How about just changing the code to
```
if [ -z "$JVM_OPTS" ] ; then
#default_options
JAVA_OPT="${JAVA_OPT} -server -Xms8g -Xmx8g -Xmn4g"
fi
```
?
But if you guys think we need `JAVA_OPT_EXT`, please go ahead ;)
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