What is Apache NiFi?
Apache NiFi is an open source software for automating and managing the flow of data between systems. It is a powerful and reliable system to process and distribute data. It provides a web-based User Interface for creating, monitoring, & controlling data flows. It has a highly configurable and modifiable data flow process that can modify data at runtime. It is easily extensible through the development of custom components.
In this tutorial, you will learn-
- What is Apache NiFi?
- Why Use Apache NIfi?
- History of Apache NiFi
- NiFi Architecture
- Apache NiFi Features
- How to Install Apache NiFi
- Nifi Use Cases
- Best practices Running Apache NiFi
- Disadvantage of Nifi
Why Use Apache NIfi?
Here, are reasons for using Apache Nifi:
- Allows you to do data ingestion to pull data into NiFi, from numerous data sources and create flow files
- It offers real-time control which helps you to manage the movement of data between any source & destination
- Visualize DataFlow at the enterprise level
- Provide common tooling and extensions
- Allows you to take advantage of existing libraries and Java ecosystem functionality
- Helps organizations to integrate Nifi with their existing infrastructure
- NiFi is designed to scale-out in clusters which offer guaranteed delivery of data
- Visualize and Monitor performance, behavior in a flow bulletin which offers insight and inline documentation
- Helps you to start and stop components separately or at the group level
- It helps you to listen, fetch, split, aggregate, route, transform and drag & drop Dataflow
History of Apache NiFi
- Developed at NSA for over eight years
- 2014- It was donated to the Apache Software Foundation
- 2015- NiFi became an official part of the Apache Project Suite
- Since then every 6-8 weeks, Apache NiFi releases a new update
NiFi Architecture
Apache NiFi has a well-thought-out architecture. Once data is fetched from external sources, it is represented as FlowFile inside Apache NiFi architecture.
Here are key components of NiFi architecture
| Nifi Component | Description |
| FlowFile | FlowFile is original data with meta-information attached to it. It allows you to process not only CSV or other record-based data, but also pictures, videos, audio, or any other binary data. |
| Flowfile processor | Performs the work which acts as a building block of data flow in NiFi. |
| Flow controller | Keeps a record of how processes are connected. It manages the threads and allocations thereof which all processes use. |
| Web Server | Web server hosts NiFi's HTTP-based commands and API. |
| Extension | There are many types of NiFi extensions which operate and execute within the JVM. |
| Connection | Acts as a linkage between processors that contain a queue and relationship(s) which affects where data is routed. |
| Back Pressure | Stop the system of becoming overrun by controlling the quantity or data size of flow files that can be stored in the queue. |
| Process Group | A process group is a set of processes and their connections, which receives and send data with the help of ports. |
| Flowfile Repository | In the FlowFile Repository, NiFi keeps track of the state of what details it has about a given FlowFile which is active in the flow. |
| Content Repository | The Content Repository is an area where the actual content bytes of a given FlowFile exist. |
| Provenance Repository | The Provenance Repository is an area where all provenance event data is gathered. |
Apache NiFi Features
- NiFi supports buffering of all queued data and offers an ability of back pressure as those queues may reach specified limits
- NiFi allows the setting of one or more prioritization schemes
- Provides connection processors for many data sources
- Support any device which runs Java
- Ideal for limited connectivity places
- Support for troubleshooting and flow optimization
- Offers role-based authentication/authorization
- Allows download, recovery, and replay of individual files
- Build your processors, controller services, and more
- Provide content encryption, communication over secure protocols
- Enables rapid development and effective testing
- Allows for the development of simple single-function components that can be reused and combined to make more complex flows
- Allows classloader isolation for easier management of dependencies
How to Install Apache NiFi
Step 1) Go to the link and click "Continue to Subscribe"
Step 2) On the next page, click "Accept Terms"
Step 3) You will see this page
Step 4) Refresh the page after 5 minutes. Click on "Continue to Configuration"
Step 5) On the next page, keep settings default and click "Continue to Launch"
Step 6) On the next page, click Launch. You may need to create a key
Step 7) You will see this success message.
Step 8) Note, the instance id and the public DNS of the EC2 instance
Step 9) In the security group, Add all traffic rule to inbound and outbound
Step 10) To access Nifi, simply use the URL
In our case it becomes
User: admin
Password: Instance Id
Step 11) You will see the NiFi home screen
Nifi Use Cases
| Industry | Usage |
| Insurance |
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| HealthCare |
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| Telecommunication |
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| Manufacturing |
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| Oil & Gas- Industry |
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| Financial Services |
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Best practices Running Apache NiFi
- Ideal to separate test/dev/production environments in NiFi
- You should break your flow into process groups
- Use a naming convention, use comments and labels
- Organize your projects into three parts ingestion, test & monitoring
- Use unique names for variable
Disadvantage of Nifi
- Need precise security and compliance controls
- You need to know the underlying system very well while working with Apache NiFi
- Must maintain chain of custody for data
- Transport / Messaging may not prove enough
- Data access needs exceed available resources to transport
- Not all data is created equally
- SSL and topic level authorization may not be sufficient
Summary
- Apache NiFi is an open source software for automating and managing the flow of data between systems
- NiFi is designed to scale-out in clusters which offer guaranteed delivery of data
- Nifi was developed at NSA for over eight years
- Once data is fetched from external sources, it is represented as FlowFile inside Apache NiFi architecture.
- FlowFile, processor, controller, web server, connection, back pressure, repository are important components of NiFi architecture
- Nifi Supports any device which runs Java
- You can easily install NiFi on AWS
- NiFi is used in varied industries such as healthcare, insurance, telecom, manufacturing, finance, oil and gas among others
- As a best practice organize your projects into three parts ingestion, test & monitoring
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