[jboss-jira] [JBoss JIRA] (WFLY-5890) Default mod_cluster load metric cpu (AverageSystemLoadMetric) is not supported on Windows

[Jan Kašík (Jira)]

    [ https://issues.jboss.org/browse/WFLY-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660509#comment-13660509 ] 

Jan Kašík commented on WFLY-5890:
---------------------------------

Since containers are more and more popular and CPU load metric is not reliable in this environment and users can choose from other pre-defined load metric, or they can define their own, I am lowering priority of this issue to MAJOR (same as product issue JBEAP-2506).

> Default mod_cluster load metric cpu (AverageSystemLoadMetric) is not supported on Windows
> -----------------------------------------------------------------------------------------
>
>                 Key: WFLY-5890
>                 URL: https://issues.jboss.org/browse/WFLY-5890
>             Project: WildFly
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 10.0.0.CR5, 14.0.0.Final
>            Reporter: Michal Karm Babacek
>            Assignee: Radoslav Husar
>            Priority: Critical
>              Labels: ux
>
> h3. Problem
> Wildfly 10's default load metric changed from *busyness* to *cpu*. Although otherwise fine, this change has a one major drawback: It doesn't work on Windows JDKs: MODCLUSTER-234. This fact has been known and acknowledged since 2011.
> {code}
> <subsystem xmlns="urn:jboss:domain:modcluster:2.0">
>     <mod-cluster-config advertise-socket="modcluster" connector="ajp">
>         <dynamic-load-provider>
>             <load-metric type="cpu"/>
>         </dynamic-load-provider>
>     </mod-cluster-config>
> </subsystem>
> {code}
> Instead of a valid Load value, subsystem returns 0 and prints: {{MODCLUSTER000045: AverageSystemLoadMetric is not supported on this system and will be disabled.}}
> h3. Example
> {code}
> C:\Users\Administrator>groovy https://gist.githubusercontent.com/Karm/be36292ae52ded419b46/raw/addd6abff5e0d63ed1ec9bee5f23e7106ea12cac/SystemLoadAverage.goovy
> load: -1.0
> avail. processors: 4
> {code}
> {code}
> mbabacek at localhost:~$ groovy https://gist.githubusercontent.com/Karm/be36292ae52ded419b46/raw/addd6abff5e0d63ed1ec9bee5f23e7106ea12cac/SystemLoadAverage.goovy
> load: 0.67
> avail. processors: 4
> {code}
> h3. Call to action
> IMHO, this is a Major user experience failure, the default should provide meaningful values on all major platforms.



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