[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-550) Failover targets should be chosen deterministically

[Radoslav Husar (JIRA)]

     [ https://issues.jboss.org/browse/MODCLUSTER-550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radoslav Husar updated MODCLUSTER-550:
--------------------------------------
        Status: Resolved  (was: Pull Request Sent)
    Resolution: Done


> Failover targets should be chosen deterministically
> ---------------------------------------------------
>
>                 Key: MODCLUSTER-550
>                 URL: https://issues.jboss.org/browse/MODCLUSTER-550
>             Project: mod_cluster
>          Issue Type: Bug
>          Components: Native (httpd modules)
>    Affects Versions: 1.2.13.Final, 1.3.5.Final
>            Reporter: Paul Ferraro
>            Assignee: Paul Ferraro
>             Fix For: 2.0.0.Alpha1, 1.2.14.Final, 1.3.6.Final
>
>
> Under the following conditions:
> 1. A request arrives for a session with an unknown route
> 2. A request arrives for a session with a known route in an error state, or if the intended worker is unresponsive and needs to failover
> ... the failover target must be chosen in a deterministic way.  This is meant to mitigate the situation where concurrent requests failover to different nodes and cause cluster-wide contention for the session.  Given a consistent ordering of workers (e.g. lexographically), the failover target should be chosen by something like: hash code of session id % active worker count.



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