Paulo Motta created CASSANDRA-10930:
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Summary: Limit off-heap memory
Key: CASSANDRA-10930
URL: https://issues.apache.org/jira/browse/CASSANDRA-10930
Project: Cassandra
Issue Type: Improvement
Components: Configuration
Reporter: Paulo Motta
Priority: Minor
Fix For: 3.x
It seems the default maximum off-heap memory varies according to the JVM
version. For oracle hotspot, this defaults to the heap size, according to
[this|https://terracotta.org/generated/4.3.1/html/bmg-all/index.html#page/bigmemory-go-webhelp/co-tiers_configuring_offheap_store.html]
and
[this|http://hg.openjdk.java.net/jdk7u/jdk7u/jdk/file/55f6804b4352/src/share/classes/sun/misc/VM.java#l279].
This may cause oomkiller to kick in if max_mem <= 2*heap.
Opening this ticket to discuss potentially limiting off-heap usage by default
on {{cassandra-env.sh}} with the {{-XX:MaxDirectMemorySize}}, but I wouldn't
know to which value. Or at least checking if max_mem > 2*heap.
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