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https://issues.apache.org/jira/browse/IGNITE-26356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020171#comment-18020171
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Didar Shayarov commented on IGNITE-26356:
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[~shishkovilja] [~shishkov_ilja]
> Clarify recommendations for -XX:MaxDirectMemorySize in docs
> -----------------------------------------------------------
>
> Key: IGNITE-26356
> URL: https://issues.apache.org/jira/browse/IGNITE-26356
> Project: Ignite
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 2.17
> Reporter: Didar Shayarov
> Assignee: Didar Shayarov
> Priority: Minor
> Labels: documentation, ise
> Fix For: 2.18
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Current documentation for memory tuning recommends setting
> -XX:MaxDirectMemorySize to walSegmentSize * 4 (if you use native
> persistance).
> This advice is misleading because the default limit for direct buffers is
> already equal to -Xmx. The formula may cause unnecessary OOME: Direct buffer
> memory errors and may mislead user to accidently decrease actual direct
> buffer size.
> There is also legacy todo in code (since at least 2020) questioning this
> recommendations.
> It is better to provide safer guidelines in docs.
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