Installing NiFi Cluster on Linux Servers | Three Nodes NiFi Cluster Installation

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To learn about Apache NiFi Cluster in Detail first you should understand about cluster. A cluster is a set of loosely or tightly connected computers. These connected computers work together so that, in many respects, we view them as a single system.

You can read more about NiFi Here

Why do we need a cluster system?

To understand why do we need a cluster, you have to understand the limitations of a single server or system.

A single system or single server is basically a single point of failure. If you lose the server, you lose all. This means you are losing business.

One server is not big enough to process the amount of data you have. If want to do move huge volume of data at a very high rate continuously then having one system is not enough.

Administrating multiple single systems are complex than managing a cluster. e.g. When your code changes, you have to deploy that code individually to all the servers individually. This increases the chances of missing important things and makes system error prone.

What are the benefits of a NiFi cluster?

Increases system resources which simply means that you have more processing power to perform complex and continuous tasks.

Option to scale when you need more processing power. You can just add nodes and make NiFi cluster more powerful.

ingle User Interface to manage your data flows. This makes job of a data flow manager very easy.

Monitoring multiple servers from a single interface, makes troubleshooting easier.

Key Terminologies:
Nodes
Each cluster is made up of one or more nodes. The nodes do the actual data processing.

Cluster Coordinator
An instance of NiFi that provides a single management point for the cluster.
Receives health and status information from the nodes.
Communicates dataflow changes to the nodes.
Maintains uniformity of dataflow across the cluster.

Heartbeats
The nodes communicate their health and status to the currently elected Cluster Coordinator via “heartbeats”, which let the Coordinator know they are still connected to the cluster and working properly.

If no heartbeat is received from any of the nodes, then that node will get disconnected. If that node starts sending heartbeat again, cluster coordinator will send request to the node to rejoin the cluster.

Primary Node
Every cluster has one and only one Primary Node.
On this node, it is possible to run “Isolated Processors” (see below).
ZooKeeper is used to automatically elect a Primary Node. If that node disconnects from the cluster for any reason, a new Primary Node will automatically be elected.
Users can determine which node is currently elected as the Primary Node by looking at the Cluster Management page of the User Interface.

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[udbhavprasad]

you have no idea how much this has helped me, thank you!

[kaustubhghode]

Great, was able to set up multinode distributed nifi using this video.
Thanks.

[JIZURIETA]

Thanks for the video. If I want to add a new node to a cluster, Is the same process? changing all de nodes?

[ashenjydev]

Thanks a lot, when deciding the hardware sizing for the Nifi nodes, what percentage of hardware should go to Linux Operating Systems and Nifi application? Normally Spark has recommended to allocate 75% to Spark nodes and the rest to OS and buffer cache

[zulhishamtan]

Thank you very much for this tutorial video.
I abled to set up nifi cluster in my VM servers.
May I have one question?
I got the Failed to communicate with peer error whenever setting the load balancer to Round Robin.
Hope you can give me some tips.
Thanks again.

[balazi_c]

Thank you so much, I'm able to configure the cluster in my servers as well.

[rock]

Thanks for the tutorial...One question, is there any preference to use embedded zookeeper or external ones in prod?

[Fudgedragonable]

Great work! Got my cluster up with your help

[himanshurajpurohit]

can you please make a video for NiFi 1.14 (3 node cluster ) deployment

[raghavendragarlapati]

Hi Vikas, Is nifi01, nifi02, nifi03 are just directories on the server or how to get there ?

[hadurrehman]

Great video . Kindly upload SSL configuration video for nifi also

[davidsnyder]

Hello Vikas...a quick question...does one first install on each separate client Nifi, and then stop the nifi service and then install the cluster on the clients? Or, is Nifi not initially separately installed on each client before the cluster install? I tried installing the cluster on nodes that did not have Nifi separately installed, and the install error'd out due to its missing a secret key. Any guidance/recommendations would be much appreciated!

[ashjadhav-gx]

Hi Vikas, could you please help with secured nifi cluster installation on aws ec2 with load balancer in front

[geetakripalani]

Hi Vikas, Thanks for the tutorial, it's quite useful. I am following the same steps as shown in the video, but i get this error "The following 1 Validation Errors occurred:
'Connect String' validated against '' is invalid because Connect String must contain at least one character that is not white space", I have set the connect string correctly in the nifi.properties, not able to figure out what could be the problem. Do you know what could be the issue and if you have faced it earlier? Thanks a lot!

[himanshurajpurohit]

Hey can you please make a video on how to create 3 node cluster on NiFi 1.15

[mayuragarwadekar]

Thanks a lot. Almost got it working. Stuck at one error. Same on all the three nodes.

"Caused by: Unable to initialize Flow because NiFi was configured to start an Embedded Zookeeper server but failed to do so"

[chandrashekharkumar]

Please check the configuration of the Cluster State Provider with ID [zk-provider] in the file

[surendranath]

Hi Vikas
I need your help on nifi and would like to connect

[kaustubhghode]

can we used 2 node instead of3 for setting up of nifi, will embedded zookeeper will cause any issue as for zookeeper 3 node is required to build quorum but in 2 node nifi setup there will be only 2?