[KNOX-2907] Events related to non-proxied services cause Knox to perform a topology redeploy

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0, 1.6.0, 1.6.1
• Fix Version/s: 2.1.0
• Component/s: cm-discovery
• Assignee: Sandor Molnar
• Reporter: Sandor Molnar
• Created: 05/May/23 07:42
• Updated: 05/May/23 15:39
• Resolved: 05/May/23 15:39

Description

Services without a ServiceModelGenerator are skipped during discovery and never added to the service configuration cache. 

https://github.infra.cloudera.com/CDH/knox/blob/d2b5466cb417f7b3882315c3d048d12e3252bb9c/gateway-discovery-cm/src/main/java/org/apache/knox/gateway/topology/discovery/cm/ClouderaManagerServiceDiscovery.java#L304

The PollingConfigurationAnalyzer does not filter the events received from CM and tries to find the source service in the configuration cache, which of course won't be possible due to the above causing non-proxied services to be handled as services newly enabled for proxying.

https://github.infra.cloudera.com/CDH/knox/blob/d2b5466cb417f7b3882315c3d048d12e3252bb9c/gateway-discovery-cm/src/main/java/org/apache/knox/gateway/topology/discovery/cm/monitor/PollingConfigurationAnalyzer.java#L267

Example services: QUEUEMANAGER (QUEUEMANAGER-1), HIVE_METASTORE (HIVE-1)

Issue Links

• links to: GitHub Pull Request #755