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https://issues.apache.org/jira/browse/TS-4922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543325#comment-15543325
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James Peach commented on TS-4922:
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Actually, adding more tracing shows that this does report different values.
Maybe the trick is to make sure we get an event after the write buffer drains?
> TSIOBufferReaderAvail not updates by the VConn write side
> ---------------------------------------------------------
>
> Key: TS-4922
> URL: https://issues.apache.org/jira/browse/TS-4922
> Project: Traffic Server
> Issue Type: Bug
> Components: TS API
> Reporter: James Peach
> Fix For: sometime
>
>
> When proxying from a plugin, you call {{TSVConnWrite}} passing in a
> {{TSIOBufferReader}} that is specific for the write side of the VC. The
> implication is that the core will use this reader to read out of the buffer
> as the plugin writes into it.
> However, if you subsequently call {{TSIOBufferReaderAvail}} on the buffer
> reader that you created, you will find that this count of available bytes
> never goes down. It seems possible (likely?) that the consumer side of the
> write never calls {{consume()}} on the reader.
> This can be demonstrated using the {{example/passthru/passthru.cc}}.
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