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https://issues.apache.org/jira/browse/PROTON-1739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell resolved PROTON-1739.
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Resolution: Fixed
> remove confusing default for session capacity and allow disabling it
> --------------------------------------------------------------------
>
> Key: PROTON-1739
> URL: https://issues.apache.org/jira/browse/PROTON-1739
> Project: Qpid Proton
> Issue Type: Improvement
> Components: proton-j
> Affects Versions: proton-j-0.24.0
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: proton-j-0.25.0
>
>
> The session has a default 'incoming capacity' of 1MB, which actually has no
> effect by default and leads to unexpected behaviour while changing other
> configuration. It should be removed.
> The value is used when the engine decides what incoming session window to set
> on Flow frames, but only if a specific frame size is configured for the
> transport, which it isn't by default. If a specific frame size is set, then
> any session capacity really needs to be set based on it in order to be
> appropriate, the default being fixed as it is leads to unexpectedly low
> window sizes in many cases which will impact performance in unexpected ways.
> Its confusing that setting frame size results in completely different
> behaviour than before for another thing (window size) which perhaps hasn't
> been configured at all, and the existing behaviour is also such that you cant
> turn it off.
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