Pierre Villard created NIFI-14014:
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Summary: Metrics endpoints may return data for "dead" instance IDs
Key: NIFI-14014
URL: https://issues.apache.org/jira/browse/NIFI-14014
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: Pierre Villard
Assignee: Pierre Villard
During the lifecycle of a NiFi node, the instance ID may change. In particular,
when a node starts, it gets a random UUID assigned as instance ID:
[https://github.com/apache/nifi/blob/rel/nifi-2.0.0/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/FlowController.java#L631]
but this instance ID will change when the node is joining the cluster:
[https://github.com/apache/nifi/blob/rel/nifi-2.0.0/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/FlowController.java#L2746-L2748]
If the metrics endpoints are called before the instance ID changes, then some
Gauges (JVM metrics, cluster metrics, storage metrics, etc) will get populated
with the initial instance ID for the instance label. Subsequent calls to the
endpoints (when the clustered Instance ID is set) will return data for the old
instance ID as well as the new instance ID.
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