ASF subversion and git services commented on PROTON-1672:

Commit 18d2cb369a6d906b2cf8403184c7e35cd00ae7c0 in qpid-proton-j's branch 
refs/heads/master from [~gemmellr]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton-j.git;h=18d2cb3 ]

PROTON-1672: replace use of Java 8+ constants

> Large deliveries comprising many transfers are handled inefficiently
> --------------------------------------------------------------------
>                 Key: PROTON-1672
>                 URL: https://issues.apache.org/jira/browse/PROTON-1672
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-j
>    Affects Versions: proton-j-0.23.0
>            Reporter: Keith Wall
>            Assignee: Timothy Bish
>            Priority: Major
>             Fix For: proton-j-0.27.0
>         Attachments: JProfiler_PROTON-1672.tiff
> Running performance tests using Qpid Broker J and Qpid JMS Client (0.26.0) 
> shows that receipt of large messages is very slow in comparison with the send 
> of the same message.   For instance, sending 300MiB bytes message takes 5 
> seconds on my laptop.  The receipt takes 97 seconds.
> Instrumenting the client stack shows an obvious hot-spot in Proton-J.  
> {{org.apache.qpid.proton.engine.impl.TransportSession#handleTransfer}} 
> re-allocates/array copies the entire delivery buffer for ever transfer that 
> comprises it.  This leads to a non-linear loss of performance.   The stack 
> include Proton-J 0.23.0, but is looks like this code is unchanged.

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