NiFi actions

Olga Semme

This article describes the main actions available for working with the service in ADCM.

To go to actions in the service, click the cluster name on the Clusters page, open the Services tab, click actions default dark actions default light in the line corresponding to NiFi service and choose the desired action.

When you select an action, ADCM displays a confirmation form. In this form, on the Confirmation tab, you can select the Verbose check box to view additional information about the action execution on the Jobs page.

Action confirmation form
Action confirmation form

To view the results of an action, go to Jobs and click the name of the corresponding action or on its component.

Next, the page with the results of the action becomes available for viewing, where you can analyze errors if they occur.

Action result
Action result
NOTE

When actions are being performed for the NiFi service, messages like FAILED - RETRYING may be displayed in the logs on the Jobs page, for example:

FAILED - RETRYING: Check NiFi Server service port (50 retries left).
...
FAILED - RETRYING: Get Nifi-Registry info from Nifi Server (50 retries left).

This is because NiFi and NiFi Registry servers may take some time to launch due to the nature of their architecture. If the next retry for the current task succeeds and the action continues to execute and completes generally without errors, messages like FAILED - RETRYING are not an indication of a failure.

If all retries have been repeated and none of them succeeded, the action is terminated and is considered unsuccessful.

Check

The Check action checks the health of the service.

In NiFi, Check checks the service availability on the port and the service status.

Restart

The Restart action stops and then starts the service. To restart the service, select the required value for the Apply configs from ADCM option. If it is set to true, all service configurations defined in ADCM settings will be applied during the service restart. Otherwise, the service restarts without applying configurations from ADCM.

Start

The Start action starts the service. To start the service, select the required value for the Apply configs from ADCM option.

Stop

The Stop action stops the service.

Add/Remove components

The Add/Remove components action allows you to change the number of components installed for the service.

After selecting the action, do:

  1. Select parameter values ​​for installation.

    Fill in the fields:

    • List of DNames to add — list of NiFi user IDs and systems to add to NiFi Server/Registry.

    • List of DNames to remove — list of NiFi user IDs and systems to remove from NiFi Server/Registry.

    To specify a user, click the + 1 symbol and enter the user name, for example CN=nifi_node_hostname, OU=Arenadata, O=Arenadata, L=Moscow, ST=Moscow, C=RU.

  2. Select hosts to install instances of the new component or remove hosts previously associated with the service component.

    Selecting hosts for a service component
    Selecting hosts for a service component

Manage Initial Admin

The Manage Initial Admin action is used when the NiFi Initial Admin parameter needs to be changed after configuring NiFi service authentication.

Performing an action triggers:

Manage Ranger plugin

The Manage Ranger plugin action triggers the Ranger NiFi plugin activation to enable NiFi service authorization.

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