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https://issues.apache.org/jira/browse/BROOKLYN-278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aled Sage resolved BROOKLYN-278.
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Resolution: Fixed
Fix Version/s: 0.10.0
> default Propagator enricher can cause infinite subscription event loop
> ----------------------------------------------------------------------
>
> Key: BROOKLYN-278
> URL: https://issues.apache.org/jira/browse/BROOKLYN-278
> Project: Brooklyn
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Aled Sage
> Fix For: 0.10.0
>
>
> The default {{Propagator}} can cause an infinite loop: it subscribes to all
> sensor events from that entity, and republishes them!
> For example, the blueprint below demonstrates this:
> {noformat}
> location: localhost
> services:
> - type: org.apache.brooklyn.entity.stock.BasicApplication
> brooklyn.enrichers:
> - type: org.apache.brooklyn.enricher.stock.Propagator
> {noformat}
> This shows repeated log messages like:
> {noformat}
> 2016-05-23 14:09:09,069 DEBUG o.a.b.c.entity.AbstractEntity
> [brooklyn-execmanager-B5OU5RXp-6]: Emitting sensor notification
> entity.location.added value LocalhostMachineProvisioningLocation{id=U27ANQ3v,
> name=localhost} on BasicApplicationImpl{id=C8KeD18W}
> {noformat}
> I'd expect such missing propagator config to cause it to fail. Or if it was
> misconfigured to cause an infinite loop, then that would also cause a failure.
> For example, the blueprint below also produces an infinite loop and should be
> forbidden:
> {noformat}
> location: localhost
> services:
> - type: org.apache.brooklyn.entity.stock.BasicApplication
> id: app
> brooklyn.enrichers:
> - type: org.apache.brooklyn.enricher.stock.Propagator
> brooklyn.config:
> producer: $brooklyn:entity("app")
> propagatingAll: true
> {noformat}
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