[jira] [Commented] (IGNITE-26356) Clarify recommendations for -XX:MaxDirectMemorySize in docs

["Didar Shayarov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-26356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020171#comment-18020171 ] 

Didar Shayarov commented on IGNITE-26356:
-----------------------------------------

[~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.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)