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apache / incubator-heron

Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter
https://heron.apache.org/
Apache License 2.0
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Remove fixed young generation heap space of instance #3789

Closed thinker0 closed 2 years ago

thinker0 commented 2 years ago

It seems that it is not suitable for JVM 11 or higher to statically allocate 50% heap.

Ref: 

For Java 11 and above
The Xmx value is 25% of the available memory with a maximum of 25 GB. 
However, where there is 2 GB or less of physical memory, the value set is 50% of available memory with 
a minimum value of 16 MB and a maximum value of 512 MB.
For Java 8
The Xmx value is half the available memory with a minimum of 16 MB and a maximum of 512 MB.

https://blog.openj9.org/2020/04/30/default-java-maximum-heap-size-is-changed-for-java-8/