Martin Harris created BROOKLYN-171:
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Summary: Mapping propagated sensor causes excessive CPU load
Key: BROOKLYN-171
URL: https://issues.apache.org/jira/browse/BROOKLYN-171
Project: Brooklyn
Issue Type: Bug
Reporter: Martin Harris
Mapping a propagated sensor using a second propagator will cause excessive CPU
load, and the sensor will fail to propagate. This can be demonstrated using the
following YAML:
location: localhost
services:
- type: org.apache.brooklyn.entity.stock.BasicApplication
brooklyn.children:
- type: org.apache.brooklyn.entity.software.base.EmptySoftwareProcess
id: childid
brooklyn.enrichers:
- type: org.apache.brooklyn.enricher.stock.Propagator
brooklyn.config:
producer: $brooklyn:component("child", "childid")
propagating:
- $brooklyn:sensor("host.name")
- type: org.apache.brooklyn.enricher.stock.Propagator
brooklyn.config:
sensorMapping:
$brooklyn:sensor("host.name"): $brooklyn:sensor("host")
Running this YAML will cause CPU load on my machine to run to around 600% CPU,
and cause the Brooklyn console to become unresponsive. The specs of my machine
are as follows:
Model Name: MacBook Pro
Model Identifier: MacBookPro11,3
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Context (aka 'Why would you ever want to do this??'):
The Redis cluster propagates the hostname of the master RedisStore up to the
cluster level [1]. We then added (in the YAML) a propagator with
`sensorMapping` to map the sensor `host.name` to `host` in order for it to be
consumed by a third party application (CloudFoundry via the
Brooklyn-Service-Broker[2])
In this scenario (i.e. Redis, deploying to AWS from a rBrooklyn server), the
server web interface becomes completely unresponsive until the Brooklyn process
is terminated and restarted
[1]:
https://github.com/apache/incubator-brooklyn/blob/6f15e8a6d61c2e648547cf7faba03fbc06716421/software/nosql/src/main/java/org/apache/brooklyn/entity/nosql/redis/RedisClusterImpl.java#L73-L76
[2]: https://github.com/cloudfoundry-incubator/brooklyn-service-broker
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