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

["Joseph Witt (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-4716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300166#comment-16300166 ] 

Joseph Witt commented on NIFI-4716:
-----------------------------------

[~markbean]  At this time issuing provenance queries is considered/handled as a mutable change.  It can/should be updated to not be as I agree with your intuition that it should have not been.  Just sharing the current state of affairs there.  The reason has to do with the fact that the query is sent/registered/stored and then the client can check for results/status/etc..

Once the node is disconnected you will be able to directly request the prov from it since it no longer has that issue.  However, hitting that NPE is indicative of an underlying problem in the data.  Some attribute/property of a prov event is null and should not have been.  Can you share more details of the stack trace?  

The line you show in your current stack trace is
            event.setClusterNodeAddress(nodeId.getApiAddress() + ":" + nodeId.getApiPort());


Is either your node API address or port empty in your nifi.properties by any chance?

Thanks
Joe

> 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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