Hello,
Probably a bug: I have a Storm cluster set up using Cloudbreak. The cluster includes only the minimum set of services needed to run Storm (Nimbus, Supervisors, Zookeeper + Ambari Metrics) - blueprint attached. One of the instance groups includes only the Storm supervisors, and I want this group to be able to scale. Scaling up works properly. Scaling down is impossible, an error is thrown. Looking at the logs, I can see that (probably) Cloudbreak is trying to find Datanodes to decommission - but since the cluster doesn't include any, an error is thrown:
cloudbreak_1 | 2018-03-30 10:07:30,986 [reactorDispatcher-6] pollWithTimeout:30 INFO c.s.c.s.PollingService - [owner:990ffe52-4eb1-4fc6-a0ac-eb8c50db8751] [type:STACK] [id:12] [name:storm-min-4] Polling attempt 1.
cloudbreak_1 | 2018-03-30 10:07:30,986 [reactorDispatcher-6] getRawResource:79 INFO c.s.a.c.AmbariClientUtils - [owner:990ffe52-4eb1-4fc6-a0ac-eb8c50db8751] [type:STACK] [id:12] [name:storm-min-4] AmbariClient getRawResource, resourceRequestMap: {path=https://172.31.38.186:9443/api/v1/clusters/storm-min-4/services/HDFS/components/NAMENODE, query={fields=metrics/dfs/namenode/DecomNodes}}
cloudbreak_1 | 2018-03-30 10:07:31,006 [reactorDispatcher-6] getRawResource:86 ERROR c.s.a.c.AmbariClientUtils - [owner:990ffe52-4eb1-4fc6-a0ac-eb8c50db8751] [type:STACK] [id:12] [name:storm-min-4] Error occurred during GET request to {}, exception:
cloudbreak_1 | groovyx.net.http.HttpResponseException: Not Found
cloudbreak_1 | at groovyx.net.http.RESTClient.defaultFailureHandler(RESTClient.java:263)
//...
cloudbreak_1 | 2018-03-30 10:07:31,006 [reactorDispatcher-6] pollWithTimeout:34 WARN c.s.c.s.PollingService - [owner:990ffe52-4eb1-4fc6-a0ac-eb8c50db8751] [type:STACK] [id:12] [name:storm-min-4] Exception occurred in the polling: Text must not be null or empty
cloudbreak_1 | java.lang.IllegalArgumentException: Text must not be null or empty
cloudbreak_1 | at groovy.json.JsonSlurper.parseText(JsonSlurper.java:203)
cloudbreak_1 | at groovy.json.JsonSlurper$parseText.call(Unknown Source)
cloudbreak_1 | at com.sequenceiq.ambari.client.services.ServiceAndHostService$Trait$Helper.getDecommissioningDataNodes(ServiceAndHostService.groovy:227)
cloudbreak_1 | at com.sequenceiq.ambari.client.services.ServiceAndHostService$Trait$Helper$getDecommissioningDataNodes$3.call(Unknown Source)
cloudbreak_1 | at com.sequenceiq.ambari.client.AmbariClient.getDecommissioningDataNodes(AmbariClient.groovy)
//... Is there any way to bypass this issue without adding an HDFS node to the cluster? I am using Cloudbreak 1.16.5storm-min-blueprint.txt
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