[jboss-jira] [JBoss JIRA] (WFLY-1708) Per-deployment web thread pools

[David Lloyd (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-1708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790715#comment-12790715 ] 

David Lloyd commented on WFLY-1708:
-----------------------------------

The problem is that RejectedExecutionException is expensive and difficult to handle properly.  The alternative is to queue indefinitely which is also potentially problematic.  By handling it at the handler, you essentially suspend the connection, and once enough connections accumulate, the server connection limiting kicks in, which works as a buffer against the server doing the Apache HTTPD thing and throwing 4xx and 5xx errors sporadically as load increases.  Instead the backlog is handled more cleanly by the server OS and TCP/IP.
                
> Per-deployment web thread pools
> -------------------------------
>
>                 Key: WFLY-1708
>                 URL: https://issues.jboss.org/browse/WFLY-1708
>             Project: WildFly
>          Issue Type: Feature Request
>          Components: Web (Undertow)
>            Reporter: James Livingston
>            Assignee: Stuart Douglas
>
> It would be nice if you could limit the number of worker threads being used by an application, and one way of achieving that would be to add a per-deployment thread pool for handing web requests.
> This can be done currently by configuring one <connector> per application and giving each one it's own thread pool.
> Undertow supports (from cursory inspection) DeploymentInfo.setExecutor/setAsyncExecutor() which configured the Executor to use for requests. The subsystem could read a thread pool configuration from jboss-web.xml and pass the resulting executor into those two methods to make setting this up easier and not require a load balancer.

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