Alexey Kukushkin created IGNITE-15460:
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Summary: Incorrect "Set max direct memory size" suggestion
Key: IGNITE-15460
URL: https://issues.apache.org/jira/browse/IGNITE-15460
Project: Ignite
Issue Type: Improvement
Affects Versions: 2.10
Reporter: Alexey Kukushkin
Ignite always outputs this performance suggestion on startup:
{{Set max direct memory size if getting 'OOME: Direct buffer memory' (add
'-XX:MaxDirectMemorySize=<size>[g|G|m|M|k|K]' to JVM options)}}
That is incorrect since:
* The Ignite [Memory and JVM
Tuning|https://ignite.apache.org/docs/latest/perf-and-troubleshooting/memory-tuning#memory-and-jvm-tuning]
page suggests NOT to explicitly set the {{MaxDirectMemorySize}} (unless native
persistence is used but in this case set it to {{walSegmentSize * 4}}). Not
setting {{MaxDirectMemorySize}} seems the right default option since in this
case JVM would choose the most appropriate default size.
* Increasing direct memory size when getting OOME for direct memory seems too
obvious to always print this information.
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