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https://issues.apache.org/jira/browse/NIFI-9839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17513984#comment-17513984
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ASF subversion and git services commented on NIFI-9839:
-------------------------------------------------------
Commit b03fdac1b5d91f867bd8f8e7591bbb373f4b9901 in nifi's branch
refs/heads/main from markap14
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=b03fdac ]
NIFI-9839: Fixed bug in which Process Group would return true for isEmpty even
if it has a Controller Service (#5910)
> NiFi fails to startup/join cluster if dataflow consists solely of Controller
> Services and Reporting Tasks
> ---------------------------------------------------------------------------------------------------------
>
> Key: NIFI-9839
> URL: https://issues.apache.org/jira/browse/NIFI-9839
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.16.0
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 1.16.1
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> To replicate:
> # Start a cluster
> # Add one or more controller services to the Root Process Group. Do not add
> any processors, labels, funnels, ports, etc.
> # Restart cluster
> This will result in a stack trace along the lines of:
> {code:java}
> 2022-03-28 11:24:28,230 ERROR org.apache.nifi.web.server.JettyServer: Unable
> to load flow due to: java.io.IOException:
> org.apache.nifi.controller.serialization.FlowSynchronizationException: Failed
> to connect node to cluster because local flow controller partially updated.
> Administrator should disconnect node and review flow for corruption.
> java.io.IOException:
> org.apache.nifi.controller.serialization.FlowSynchronizationException: Failed
> to connect node to cluster because local flow controller partially updated.
> Administrator should disconnect node and review flow for corruption.
> at
> org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:524)
> at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1086)
> at org.apache.nifi.NiFi.<init>(NiFi.java:170)
> at org.apache.nifi.NiFi.<init>(NiFi.java:82)
> at org.apache.nifi.NiFi.main(NiFi.java:330)
> Caused by:
> org.apache.nifi.controller.serialization.FlowSynchronizationException: Failed
> to connect node to cluster because local flow controller partially updated.
> Administrator should disconnect node and review flow for corruption.
> at
> org.apache.nifi.controller.StandardFlowService.loadFromConnectionResponse(StandardFlowService.java:1057)
> at
> org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:520)
> ... 4 common frames omitted
> Caused by:
> org.apache.nifi.controller.serialization.FlowSynchronizationException:
> java.lang.IllegalStateException: The specified observer identifier
> (bulletin-observer) already exists.
> at
> org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.synchronizeFlow(VersionedFlowSynchronizer.java:362)
> at
> org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.sync(VersionedFlowSynchronizer.java:185)
> at
> org.apache.nifi.controller.serialization.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:43)
> at
> org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1479)
> at
> org.apache.nifi.persistence.StandardFlowConfigurationDAO.load(StandardFlowConfigurationDAO.java:104)
> at
> org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:815)
> at
> org.apache.nifi.controller.StandardFlowService.loadFromConnectionResponse(StandardFlowService.java:1026)
> ... 5 common frames omitted
> Caused by: java.lang.IllegalStateException: The specified observer identifier
> (bulletin-observer) already exists.
> at
> org.apache.nifi.logging.repository.StandardLogRepository.addObserver(StandardLogRepository.java:169)
> at
> org.apache.nifi.controller.flow.StandardFlowManager.createControllerService(StandardFlowManager.java:490)
> at
> org.apache.nifi.groups.StandardProcessGroupSynchronizer.addControllerService(StandardProcessGroupSynchronizer.java:1033)
> at
> org.apache.nifi.groups.StandardProcessGroupSynchronizer.synchronizeControllerServices(StandardProcessGroupSynchronizer.java:457)
> at
> org.apache.nifi.groups.StandardProcessGroupSynchronizer.synchronize(StandardProcessGroupSynchronizer.java:339)
> at
> org.apache.nifi.groups.StandardProcessGroupSynchronizer.lambda$synchronize$0(StandardProcessGroupSynchronizer.java:221)
> at
> org.apache.nifi.controller.flow.AbstractFlowManager.withParameterContextResolution(AbstractFlowManager.java:462)
> at
> org.apache.nifi.groups.StandardProcessGroupSynchronizer.synchronize(StandardProcessGroupSynchronizer.java:219)
> at
> org.apache.nifi.groups.StandardProcessGroup.synchronizeFlow(StandardProcessGroup.java:3830)
> at
> org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.synchronizeFlow(VersionedFlowSynchronizer.java:353)
> ... 11 common frames omitted {code}
> However, if any other components are added to the root group, such as a
> process or a child process group, this won't happen.
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