Sajinie Kavindya created HTTPCORE-730:
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Summary: 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
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?
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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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