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https://issues.apache.org/jira/browse/HTTPCORE-730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCORE-730.
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Fix Version/s: 4.4.16
Resolution: Fixed
> High CPU Utilization if data is not read from SharedInputBuffer when the
> internal buffer is completely full
> -----------------------------------------------------------------------------------------------------------
>
> Key: HTTPCORE-730
> URL: https://issues.apache.org/jira/browse/HTTPCORE-730
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.4.16
> Reporter: Sajinie Kavindya
> Priority: Major
> Fix For: 4.4.16
>
> Attachments: HttpNIOTest.zip
>
>
> In 4.4.16-SNAPSHOT, when I use SharedInputBuffer class and do not read the
> data from the buffer by calling 'read' methods when the buffer is completely
> full, I experience a high CPU utilization. By looking at the
> 'SharedInputBuffer#consumeContent' method implementation, I can see that the
> input is suspended when the buffer does not have enough space to get data
> transferred from the ContentDecoder. But even after suspending the input, I
> noticed that the event mask associated with the session was still 'read'.
> Furthermore, SharedInputBuffer in 5.x is implemented in a way to adjust the
> capacity of the buffer to ensure it can accommodate the required capacity
> (and no input suspension). Hence, I believe 5.x might not have the above
> behavior. But unfortunately, moving to 5.x is not an option for me at this
> moment.
> So, does 4.x really have a bug here under the above-mentioned conditions? If
> not, could you please explain this behavior?
> ----
> Attaching a sample program, which will exhibit the problem. Please note that
> I have done the following alteration to the BasicAsyncResponseConsumer class.
> * the internal buffer is the type of 'SharedInputBuffer'.
> * MAX_INITIAL_BUFFER_SIZE value is set to 16384 bytes.
> Also,
> * Backend sends a payload larger than MAX_INITIAL_BUFFER_SIZE.
> * SharedInputBuffer#read method is not invoked by any threads purposefully.
> * The latest 4.x branch (4.4.16-SNAPSHOT) is used inside this program.
> You may run the 'Main' class of the program.
> Your input is highly appreciated.
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