[jira] [Created] (HTTPCORE-721) High CPU usage observed when the server closes the connection after responding with the Keep-alive header to a load test with large payload.

["Sajinie Kavindya (Jira)" <ji...@apache.org>]

Sajinie Kavindya created HTTPCORE-721:
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             Summary: High CPU usage observed when the server closes the connection after responding with the Keep-alive header to a load test with large payload. 
                 Key: HTTPCORE-721
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-721
             Project: HttpComponents HttpCore
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.4.15
         Environment: JDK 8_261 and above
            Reporter: Sajinie Kavindya
         Attachments: HTTPClient.jmx, HttpCoreNIOTestServer.zip

Hi,

In HTTPCoreNIO 4.4.15, for JDK 8_261 and above, we can observe a high CPU usage for the following scenario.

Client behavior: sends POST/PUT requests with a payload greater than the buffer size. Should be a load test at least with two requests.

Server behavior:  responds with the Connection: keep-alive header and immediately closes the connection using the connection close method.

Please note that for JDK version < JDK 8_261, this is not reproducible. In order to reproduce the issue, I have written a test server and a JMeter script to act as a client.

Reproducible steps:

TestServer.java - Run this main class, which starts the server on port 8253. (I have only changed the “completeResponse” method to close the connection at line #753).

HTTPClient.jmx - Start this JMeter script, which sends two POST requests to the server with a large payload. 

Please let us know the validity of this scenario. For now, I am creating this as a Bug as high CPU usage is observed.

Thanks & Regards,
Sajinie



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