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  1. WildFly
  2. WFLY-5890

Default mod_cluster load metric cpu (AverageSystemLoadMetric) is not supported on Windows

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Details

    • Bug
    • Resolution: Unresolved
    • Major
    • None
    • 10.0.0.CR5, 14.0.0.Final
    • mod_cluster

    Description

      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.

      <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>

      Instead of a valid Load value, subsystem returns 0 and prints: MODCLUSTER000045: AverageSystemLoadMetric is not supported on this system and will be disabled.

      Example

      C:\Users\Administrator>groovy https://gist.githubusercontent.com/Karm/be36292ae52ded419b46/raw/addd6abff5e0d63ed1ec9bee5f23e7106ea12cac/SystemLoadAverage.goovy
load: -1.0
avail. processors: 4

      mbabacek@localhost:~$ groovy https://gist.githubusercontent.com/Karm/be36292ae52ded419b46/raw/addd6abff5e0d63ed1ec9bee5f23e7106ea12cac/SystemLoadAverage.goovy
load: 0.67
avail. processors: 4

      Call to action

      IMHO, this is a Major user experience failure, the default should provide meaningful values on all major platforms.

      Attachments

        Issue Links

          clones

          Bug - A problem that impairs or prevents the functions of the product. JBEAP-2506 Default mod_cluster load metric cpu (AverageSystemLoadMetric) is not supported on Windows

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed
          is related to

          Bug - A problem that impairs or prevents the functions of the product. MODCLUSTER-234 AverageSystemLoadMetric in Tomcat 6 broken on Windows

          • Blocker - To be worked above all other priorities. This term is chosen when the severity of the issue is very high, has no workaround, or the effort for the change is comparatively low. Issues that may be very publicly visible and could generate significant media attention may also drive a higher priority.
          • Closed

          Activity

            People

              rhn-engineering-rhusar Radoslav Husar
              mbabacek1@redhat.com Michal Karm
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              Dates

                Created:
                Updated: