[jira] [Created] (NIFI-4716) Provenance query unhandled exception when Node disconnected

["Mark Bean (JIRA)" <ji...@apache.org>]

Mark Bean created NIFI-4716:
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             Summary: Provenance query unhandled exception when Node disconnected
                 Key: NIFI-4716
                 URL: https://issues.apache.org/jira/browse/NIFI-4716
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.4.0
            Reporter: Mark Bean


Scenario: 2-node Cluster with one Node disconnected. Using the UI of the surviving Node, when attempting a Data Provenance query, a popup error dialog indicates "Cluster is unable to service request to change flow: Node <disconnected-node-server:port> is currently disconnected.". This occurs even before the Provenance Events list is generated.

However, using the UI of the disconnected Node the same Data Provenance query is attempted. Now, a list of Provenance events is displayed. Then, when choosing 'View Details', an uncaught exception occurs: "An unexpected error has occurred. Please check the logs for additional details."

The nifi-user.log indicates:
o.a.nifi.web.api.config.ThrowableMapper An unexpected error has occurred: java.lang.NullPointerException. Returning Internal Server Error response
java.lang.NullPointerException: null
    at org.apache.nifi.web.api.ProvenanceEventResource.getProvenanceEvent(ProvenanceEventResource.java:297)
...

First, the error reported by the connected Node is misleading. An attempt to change the flow has not been made.

Second, recommend the disconnected Node behave as the connected Node and immediate return an error on an attempt to query provenance. (However, the error should be more descriptive of the problem as noted above.)




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