Installing NiFi Cluster on Linux Servers | Three Nodes NiFi Cluster Installation
Channel: Vikas Jha
Date: 2020-10-20

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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
https://www./apache-nifi-cluster-in-detail/

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. 
By default, nodes send heartbeats every 5 seconds, this is configuration and can be changed in nifi.properties

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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