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From "Robbie Gemmell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PROTON-636) remove confusing default for session capacity and allow disabling it
Date Wed, 11 Apr 2018 10:04:00 GMT

     [ https://issues.apache.org/jira/browse/PROTON-636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robbie Gemmell updated PROTON-636:
    Issue Type: Improvement  (was: Bug)

> remove confusing default for session capacity and allow disabling it
> --------------------------------------------------------------------
>                 Key: PROTON-636
>                 URL: https://issues.apache.org/jira/browse/PROTON-636
>             Project: Qpid Proton
>          Issue Type: Improvement
>          Components: proton-c
>            Reporter: Rafael H. Schloming
>            Assignee: Alan Conway
>            Priority: Major
>              Labels: framing
>             Fix For: proton-c-0.23.0
> Original title: setting a 1MB frame size results in an undesirably small session window)
> Description, from PROTON-1739:
> 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
> 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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