[jboss-jira] [JBoss JIRA] (WFLY-9397) Once hitting the max-connections limit, new connections are not accepted any more and CLOSE_WAIT connections increase gradually

[Masafumi Miura (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-9397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Masafumi Miura closed WFLY-9397.
--------------------------------
    Resolution: Done


> Once hitting the max-connections limit, new connections are not accepted any more and CLOSE_WAIT connections increase gradually
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: WFLY-9397
>                 URL: https://issues.jboss.org/browse/WFLY-9397
>             Project: WildFly
>          Issue Type: Bug
>          Components: Web (Undertow)
>    Affects Versions: 11.0.0.CR1
>            Reporter: Masafumi Miura
>            Assignee: David Lloyd
>             Fix For: 12.0.0.Final
>
>
> Once hitting the {{max-connections}} limit of listener, WildFly does not accept new connections any more. Even after all request processing are completed, WildFly does not accept. So, any client can not connect to the server.
> In addition, when a client send a new request and close the connection from client-side due to timeout or cancellation in such situation, CLOSE_WAIT connections remain until WildFly Java process is stopped. 
> I think this issue is related to XNIO-276 and XNIO-279, which both fixes are merged in XNIO 3.4 branch but it's not merged (or partially merged) in XNIO 3.5 branch: 
> - XNIO-276 - If QueuedNioTcpServer hits the max connection limit it gets stuck in an infinite loop
>   This issue is fixed by the two commits [6a5d04e|https://github.com/xnio/xnio/commit/6a5d04e3be98ee68a9fb1f9f98eb4e72636b94da] and [8c0af87|https://github.com/xnio/xnio/commit/8c0af87f5dfdee96af2e3000e47e69d8f5671dbc] which were merged in 3.4 branch. However, 8c0af87 is not included in 3.5 branch.
> - XNIO-279 - QueuedNioTcpServer can go into an infinite loop if accept fails
>   This issue is fixed by the commit [86d0f6c|https://github.com/xnio/xnio/commit/86d0f6cc4bc41443b7e9442989e56581443a9e62] in 3.4 branch. However, this is not included in 3.5 branch.



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