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https://issues.apache.org/jira/browse/NIFI-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386923#comment-15386923
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ASF GitHub Bot commented on NIFI-2333:
--------------------------------------
Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/693
+1
Visually verified code and did a contrib check build. On secure 3 node
cluster, I reproduced the problem without the fix applied and then verified
that the PR fixed the problem. Thanks @markap14, I will merge it in. #
> When a flow consists only of controller-level reporting tasks/controller
> services, nodes cannot rejoin cluster once they have disconnected
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: NIFI-2333
> URL: https://issues.apache.org/jira/browse/NIFI-2333
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.0.0
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Blocker
> Fix For: 1.0.0
>
>
> I have a cluster with 3 nodes. If I disconnect and reconnect a node with
> nothing in the flow, all works okay. If I add processors to the graph, all
> works okay. But if I have no components on the graph but define
> controller-level controller services or reporting tasks, then when I
> disconnect the node it fails to reconnect when I click 'reconnect'. I end up
> with the following stack trace:
> 2016-07-20 15:19:28,259 ERROR [Reconnect to Cluster]
> o.a.nifi.controller.StandardFlowService Handling reconnection request failed
> due to:
> 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.
> 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:869)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowService.handleReconnectionRequest(StandardFlowService.java:591)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowService.access$300(StandardFlowService.java:97)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowService$2.run(StandardFlowService.java:403)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]
> Caused by:
> org.apache.nifi.controller.serialization.FlowSynchronizationException:
> java.lang.IllegalStateException: The specified observer identifier already
> exists.
> at
> org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:358)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1375)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.persistence.StandardXMLFlowConfigurationDAO.load(StandardXMLFlowConfigurationDAO.java:81)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:670)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowService.loadFromConnectionResponse(StandardFlowService.java:841)
> [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> ... 4 common frames omitted
> Caused by: java.lang.IllegalStateException: The specified observer identifier
> already exists.
> at
> org.apache.nifi.logging.repository.StandardLogRepository.addObserver(StandardLogRepository.java:134)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.FlowController.createReportingTask(FlowController.java:2734)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowSynchronizer.addReportingTask(StandardFlowSynchronizer.java:467)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> at
> org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:326)
> ~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
> ... 8 common frames omitted
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