[jira] [Closed] (PROTON-1171) [proton-j] transport SSL wrapper does not flush all decoded bytes to the underlying input

["Robbie Gemmell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PROTON-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Gemmell closed PROTON-1171.
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    Resolution: Fixed

As discussed on the list, as it isn't clear from further inspection that its the same issue and given the earlier changes seem to give a good improvement on previous behaviour, plus 0.12.2 was already at a passing state, we have proceeded with 0.12.2 containing the earlier changes.

I will close this JIRA given it is has changes against a released version, a new JIRA can be used for any further changes and linked back to this one.

> [proton-j] transport SSL wrapper does not flush all decoded bytes to the underlying input
> -----------------------------------------------------------------------------------------
>
>                 Key: PROTON-1171
>                 URL: https://issues.apache.org/jira/browse/PROTON-1171
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-j
>    Affects Versions: 0.12.0, 0.12.1
>         Environment: Any
>            Reporter: Sreeram Garlapati
>            Assignee: Robbie Gemmell
>            Priority: Critical
>             Fix For: 0.13.0, 0.12.2
>
>
> Actual Issue/scenario hit by Microsoft Azure EventHubs:
>  We have a pattern where customers sends messages in a burst to our Queue and stop sending and then wait for all of them to be received.
> Because of this issue in Proton-j Amqp implementation - we can see many bytes were stuck in the SSL Decode Buffer and were only picked up when new transport frames arrive.
> Given that this is a 1 line fix - it would be great if you folks can publish an incremental minor update to 0.12.X.
> Here are my findings after debugging through this issue:
> -          When incoming bytes arrive on the SocketChannel – proton-j client gets signaled by nio & as a result it unwinds the transport stack – as a result all the TransportInput implementations performs its task on the Read Bytes and hands off to the Next Layer in the stack (transport to ssl, ssl to frameparser etc).
> -          While unwinding that stack, SimpleSSLTransportWrapper.unwrapInput reads(16k bytes) from _inputBuffer and the result - decoded bytes are written to _decodedInputBuffer – as an intermediate buffer.
> -          It then flushes bytes from intermediate buffer to the next layer & invokes an _underlyingInput.Process() – to signal it that it has bytes in its input buffer.
> -          If the underlyingInput (lets say FrameParser) buffer size is small – lets say 4k – then decodedInputBuffer will be left with 12k bytes & Over time this accrues.
> The fix here is to flush decodedInputBuffer to the Next transport in the Network Stack & call _underlyingInput.Process() - until decodedInputBuffer is empty. Here’s the pull request: 
> https://github.com/apache/qpid-proton/pull/73



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