Robbie Gemmell created PROTON-1739:
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Summary: 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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