[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-645) Different handling of max-attempts parameter on Undertow and httpd implementation

[Jan Kašík (JIRA)]

    [ https://issues.jboss.org/browse/MODCLUSTER-645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543376#comment-13543376 ] 

Jan Kašík commented on MODCLUSTER-645:
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During further investigation, I found out, that if i set 0 to max-attempts on Undertow balancer, it behaves in same manner as if there was 1 set (it does exactly one request total) which is really unexpected. On httpd, where max-attempts is treated as count of failover retries, the request is sent exactly once to workers. I failed to find documentation of this behavior for Undertow, but I did find it for httpd on [1].

[1] http://modcluster.io/documentation/#proxy-configuration-1

> Different handling of max-attempts parameter on Undertow and httpd implementation
> ---------------------------------------------------------------------------------
>
>                 Key: MODCLUSTER-645
>                 URL: https://issues.jboss.org/browse/MODCLUSTER-645
>             Project: mod_cluster
>          Issue Type: Bug
>    Affects Versions: 1.3.5.Final
>            Reporter: Jan Kašík
>            Assignee: Jean-Frederic Clere
>
> The behavior of balancer is different on httpd in comparsion with Undertow implementation when max-attempts parameter is set.
> * *Undertow*: max-attempts is total count of requests made by balancer in failover scenario. When max-attemps is set to 1 and target worker fails after first attempt made by balancer, no further attempts are made.
> * *httpd*: max-attempts is count of retries made by balancer after first attempt fails. When max-attempts is set to 1 and target worker fails after first attempt made by balancer, second worker is chosen and request is sent towards it.
> This doesn't seem right and I suggest to unify behavior across implementations.



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