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QE Test Coverage:
+
Target Release:

7.2.z.GA
Workaround:

Workaround Exists
Workaround Description:

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-Dxnio.nio.alt-queued-server=false

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-Dxnio.nio.alt-queued-server=false
Git Pull Request:
https://github.com/xnio/xnio/pull/211, https://gitlab.cee.redhat.com/xnio/xnio/commit/c730183c77b62e036a30bea82e67990ff8f8f082
Steps to Reproduce:
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1. _/subsystem=undertow/server=default-server/http-listener=default:write-attribute(name=max-connections,value=20)
reload_
2. deploy the attached long-running-servlet.war
3. perform requests (the duration parameter dictates how much time in ms the request processing should take):

for i in {1..300}; do curl http://localhost:8080/long-running-servlet/HeavyProcessing?duration=5000 & done

4. you can see the way the requests are being processed in the server log
Show
1. _/subsystem=undertow/server=default-server/http-listener=default:write-attribute(name=max-connections,value=20) reload_ 2. deploy the attached long-running-servlet.war 3. perform requests (the duration parameter dictates how much time in ms the request processing should take): for i in {1..300}; do curl http: //localhost:8080/ long -running-servlet/HeavyProcessing?duration=5000 & done 4. you can see the way the requests are being processed in the server log

There is a change in behavior of the max-connections attribute in Undertow's http(s)-listener between EAP 7.2.4 and 7.2.5.CR1.

Let's say max-connections=10:

7.2.4: the number of concurrent connections is limited to 10, additional connections are rejected
7.2.5.CR1: there are still only up to 10 connections created, but the additional requests are no longer rejected, but instead processed in batches of 10

It looks like the change actually comes from the XNIO upgrade to 3.7.6 (~~JBEAP-17665~~)

clones

XNIO-355 Alternative queued acceptor should be disabled by default

is incorporated by

JBEAP-17880 (7.2.z) Upgrade XNIO from 3.7.6.Final-redhat-00001 to 3.7.6.SP1

relates to

JBEAP-17711 [GSS](7.2.z) Introduce alternative queued acceptor to fix XNIO-258 XNIO-286 XNIO-335 XNIO-265

JBEAP-17910 (7.3.0) Document Undertow max-connections behavior when # of requests > max-connections