NiFi actions

Olga Semme

This article describes the main actions available for working with the service using the Actions green arrow icon in ADCM.

To go to the actions in the service, do the following:

  1. On the CLUSTERS tab click on the row with the cluster.

  2. In the cluster menu that opens, go to the Services page.

  3. Click on the Actions icon green arrow in the row corresponding to the NiFi service and choose the desired action.

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Available actions in NiFi

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

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View the action result

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

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Action result

Check

The Check action checks the health of the service.

After selection, confirm the action by clicking Run.

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Action confirmation

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

Expand

The Expand action expands the number of service instances in the established cluster. To expand the number of service instances, do the following:

  1. Set options for installing new instances of the service.

  2. Confirm your choice by clicking Next.

    kafka actions 05
    Configuration to run cluster extension
    Options for installing new service instances
    Option Description

    Disable SELinux

    Disable SELinux on added hosts. In order for this setting to take effect, after the Install operation is completed, you must restart the hosts manually

    Disable Firewalld

    Shutting down firewalld on hosts

    Install OpenJDK

    Installing java-1.8.0-openjdk package on hosts

    Set vm.swappiness to 0

    Disabling swapping on hosts

    Configure /etc/hosts

    Write added nodes to /etc/hosts on cluster hosts. It is recommended to disable this option if DNS is configured

  3. Add the required number of hosts and place on it the components available for placement.

  4. Confirm the action by clicking Run.

    nifi actions 07
    Installing service components for cluster expansion

Shrink

The Shrink action reduces the number of service instances in the installed cluster. To reduce the number of service instances, do the following:

  1. Fill in List the DNames — a list of user and system IDs to remove from the NiFi Server/Registry. To enter each user, click on the + symbol and enter the username, for example CN=nifi_node_hostname, OU=Arenadata, O=Arenadata, L=Moscow, ST=Moscow, C=RU.

  2. Click Next.

    nifi actions 24
    List to remove from NiFi Server/Registry

  3. Select which components to remove from which host.

  4. Confirm the action by clicking Run.

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Removing service components to reduce the cluster

Restart

The Restart action stops and then starts the service.

After selection, confirm the action by clicking Run.

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Action confirmation

Start

The Start action starts the service.

After selection, confirm the action by clicking Run.

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Action confirmation

Stop

The Stop action stops the service.

After selection, confirm the action by clicking Run.

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Action confirmation

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.

After selecting the action, enter the new user DN and password in the opened Run an action window and click Run.

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Change NiFi Initial Admin

Performing an action triggers:

Manage Ranger plugin

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

After selecting an action, in the opened window Run an action:

  1. Check required state of parameter Desired plugin state — after selecting enable state, the default policy for Ranger NiFi plugin will be applied to Ranger.

  2. Specify Ranger Admin Identity — DN of the certificate that Ranger will use to communicate with NiFi.

  3. Click Run.

    nifi actions 26
    Enable Ranger NiFi Plugin
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