[teiid-issues] [JBoss JIRA] (TEIID-3635) Auto configuration of buffermanager values can be incorrect

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-3635.
-----------------------------------
    Fix Version/s: 8.11.3
       Resolution: Done


Updated the auto configuration to more conservatively allocate processor max kb as for small max active plans there was too much overhead, reduce the overall max reserve, make the allocation more balanced between the memory buffer and the reserve space (with the overall memory buffer size still approximately the same given the overall reduction of the max reserve).  Also updated the docs based upon this and expanded more on the expectations / interplay of the settings.

For Teiid 9 we'll look into normalizing the setting names and units as we've accumulated some complexity over the years from effectively 3 major revisions.

> Auto configuration of buffermanager values can be incorrect
> -----------------------------------------------------------
>
>                 Key: TEIID-3635
>                 URL: https://issues.jboss.org/browse/TEIID-3635
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.0
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>            Priority: Critical
>             Fix For: 8.12, 8.11.3
>
>
> If the heap size is significantly larger than 2 gb, such that the auto computed value for the max reserve is larger than 2 gb and the memory buffer size is also auto calculated, then the computed values for max reserve and max memory buffer can be significantly different than expected.  At worst this results in the max memory buffer size of 0, which just default the buffer to being accessible by a single thread.



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