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https://issues.apache.org/jira/browse/PROTON-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239286#comment-15239286
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ASF GitHub Bot commented on PROTON-1171:
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Github user gemmellr commented on the pull request:
https://github.com/apache/qpid-proton/pull/73#issuecomment-209455781
I have made a change that should resolve this. Its a little different than
your proposal to both resolve an issue with it (unlikely but possible infinite
loop), and also change some other existing behaviours I found while digging
into it. If you could give it a try with your bits and report back that would
be great.
> [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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