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https://issues.apache.org/jira/browse/TS-1496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan M. Carroll updated TS-1496:
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Attachment: ts-1496.diff
Updated patch. Better handling in some extreme cases, tested against cache
reads (flow controls correctly in that case).
> Traffic Server with null-transform buffering large responses when client
> connection slow
> ----------------------------------------------------------------------------------------
>
> Key: TS-1496
> URL: https://issues.apache.org/jira/browse/TS-1496
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 3.2.0
> Environment: Red Hat 6.3
> Reporter: snf
> Assignee: Alan M. Carroll
> Fix For: 3.3.4
>
> Attachments: ts-1496.diff, TS-1496.patch, TS-1496.patch
>
>
> Scenario: Traffic Server started with the null-transform plugin. The link
> between the client and Traffic Server is slower than the link between the
> Traffic Server and the Origin Server.
> Affect: If the client requests a large file from the Origin Server, the
> whole file can be transmitted to, and buffered by, Traffic Server before
> content is released to the client. This is a bigger issue if a large number
> of clients request large files then the Traffic Server could end up buffering
> very large amounts of content.
> Expected behaviour: The Traffic Server should not download all the content
> from the Origin Server. Instead, if the client is slow receiving from
> Traffic Server, then Traffic Server should be slow receiving from the Origin
> Server. Traffic Server should facilitate end to end flow control between
> client and Origin Server.
> Tools to replicate problem: Use Traffic Control to set a lower bandwidth on
> the client machine.
> Possible related area in the Traffic Server code: The following comment
> appears in proxy/http/Httptunnel.cc
> 48 static void
> 49 chunked_reenable(HttpTunnelProducer * p, HttpTunnel * tunnel)
> 50 {
> 51
> 52 // FIX ME: still need to deal with huge chunk sizes. If a chunk
> 53 // is 1GB, we will currently buffer the whole thing
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