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https://issues.apache.org/jira/browse/HTTPCLIENT-2334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17869561#comment-17869561
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Oleg Kalnichevski commented on HTTPCLIENT-2334:
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> If returning zero when no data is available is required the documentation
> should make it a lot more clear
[~a701440] Agreed. Please see proposed javadoc improvements [1]
> I guess the other question is will it keep calling "available()" in a tight
> loop then?
No, it will not. Output readiness events will get suspended.
Oleg
[1]
[https://github.com/apache/httpcomponents-core/compare/5.2.x...HTTPCLIENT-2334]
> AsyncDataProducer.produce gets into a tight loop
> ------------------------------------------------
>
> Key: HTTPCLIENT-2334
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2334
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (async)
> Affects Versions: 5.2.2
> Reporter: Alex
> Priority: Major
>
> I am using async data transfer for http request (POST) and using
> AsyncDataProducer interface produce method. This method seems to be called
> multiple times in a tight NIO loop when it does not immediately produce data
> when called. In my case it needs to store the provided DataStreamChannel and
> return, so that DataStreamChannel can be used later when data for the request
> is available. However the method seems to be called again immediately in a
> tight loop and is causing high CPU consumption. Effectively I had to make it
> blocking which is not the intent of the API.
>
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