hnakamor opened a new issue, #15431:
URL: https://github.com/apache/druid/issues/15431
### Affected Version
Druid 28.0.0
### Description
I have druid-kubernetes-extensions loaded and running in a zookeeper-less
environment.
I really like the zookeeper-less feature as it works well in my environment
and simplifies the components.
I was also very excited about the mm-less k8sAndWorker mode introduced in
Druid 28.0.0, as it matched the use case mentioned in #15196.
Unfortunately, I wanted to configure mm-less k8sAndWorker mode for this
zookeeper-less environment, but when I configured k8sAndWorker mode, overlord
would not start with an error.
The configuration and error for this environment is as follows
- common.runtime.properties
```
# Extensions
druid.extensions.loadList=["druid-datasketches","mysql-metadata-storage","druid-s3-extensions","druid-kafka-indexing-service","druid-bloom-filter","druid-multi-stage-query","prometheus-emitter","druid-kubernetes-extensions"]
# Zookeeper less
druid.zk.service.enabled=false
druid.serverview.type=http
druid.coordinator.loadqueuepeon.type=http
druid.indexer.runner.type=httpRemote
druid.discovery.type=k8s
druid.discovery.k8s.clusterIdentifier=${env:POD_NAMESPACE}
# Service discovery
druid.selectors.indexing.serviceName=druid/overlord
druid.selectors.coordinator.serviceName=druid/coordinator
```
- Overlord(coordinator)'s runtime.properties
```
# Extensions
druid.extensions.loadList=["druid-datasketches","mysql-metadata-storage","druid-s3-extensions","druid-kafka-indexing-service","druid-bloom-filter","druid-multi-stage-query","prometheus-emitter","druid-kubernetes-extensions","druid-kubernetes-overlord-extensions"]
# MM less
druid.indexer.runner.type=k8sAndWorker
druid.indexer.runner.namespace=mynamespace
druid.indexer.task.encapsulatedTask=true
druid.indexer.runner.k8sAndWorker.runnerStrategy.type=taskType
druid.indexer.runner.k8sAndWorker.runnerStrategy.taskType.default=k8s
druid.indexer.runner.k8sAndWorker.runnerStrategy.taskType.overrides={"index_kafka":
"worker"}
# Configure this coordinator to also run as Overlord
druid.coordinator.asOverlord.enabled=true
druid.coordinator.asOverlord.overlordService=druid/overlord
```
-
[k8sAndWorker_error.log](https://github.com/apache/druid/files/13463097/k8sAndWorker_error.log)
As additional information, I have confirmed that the k8s mode of mm-less
will start overlord even in the zookeeper-less environment.
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