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Koffi
Koffi
Gold ⭐️
March 17, 2020
Solved

Can't connect to the nifi UI

Hi,

I have a hadoop environment that has 2 nifi nodes running. I am not able to connect to the nifi UI since yesterday and i try do restart one of the node without any success....

 

In in nifi-app.log, file seeing this as only Error level error:

2020-03-17 13:42:37,974 ERROR [main] o.a.n.c.c.node.NodeClusterCoordinator Event Reported for ***-nf02.****.ca:9091 -- Node disconnected from cluster due to org.apache.nifi.controller.UninheritableFlowException: Failed to connect node to cluster because local flow is different than cluster flow.

 

Could please help?

MattWho
MattWhoAnswer
Titanium ⭐️⭐️⭐️
March 24, 2020

@Koffi 

 

When a NiFi node attempts to connect to an existing NiFi cluster, there are three files that are checked to make sure they match exactly between the connecting node and the existing copies in the cluster.  Those files are:

1. flow.xml.gz

2. users.xml (will only exist if NiFi is secured over https)
3. authorizations.xml (not to be confused with the NiFi authorizers.xml file.  Will only exist if NiFi is secured over https)

The output in the nifi-app.log of the node should explain exactly what the mismatch was the first time it tried to connect to the cluster.

 

Hope this helps,

Matt

 

 

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2 replies

DavidR
DavidR
Silver ⭐️⭐️⭐️
March 17, 2020

You need to stop the nifi node that is outputing that error, copy the flow.xml.gz from the nifi/conf dir from a healthy node and start nifi again

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    MattWho
    Titanium ⭐️⭐️⭐️
    MattWhoAnswer
    Titanium ⭐️⭐️⭐️
    March 24, 2020

    @Koffi 

     

    When a NiFi node attempts to connect to an existing NiFi cluster, there are three files that are checked to make sure they match exactly between the connecting node and the existing copies in the cluster.  Those files are:

    1. flow.xml.gz

    2. users.xml (will only exist if NiFi is secured over https)
    3. authorizations.xml (not to be confused with the NiFi authorizers.xml file.  Will only exist if NiFi is secured over https)

    The output in the nifi-app.log of the node should explain exactly what the mismatch was the first time it tried to connect to the cluster.

     

    Hope this helps,

    Matt

     

     

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