Aled Sage created BROOKLYN-278:
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Summary: 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
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:
{nofromat}
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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