Imran Rashid created SPARK-24938:
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Summary: Understand usage of netty's onheap memory use, even with
offheap pools
Key: SPARK-24938
URL: https://issues.apache.org/jira/browse/SPARK-24938
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.4.0
Reporter: Imran Rashid
We've observed that netty uses large amount of onheap memory in its pools, in
addition to the expected offheap memory when I added some instrumentation
(using SPARK-24918 and https://github.com/squito/spark-memory). We should
figure out why its using that memory, and whether its really necessary.
It might be just this one line:
https://github.com/apache/spark/blob/master/common/network-common/src/main/java/org/apache/spark/network/protocol/MessageEncoder.java#L82
which means that even with a small burst of messages, each arena will grow by
16MB which could lead to a 128 MB spike of an almost entirely unused pool.
Switching to requesting a buffer from the default pool would probably fix this.
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