This post is going to cover the basic terminology that you’ll need to know for working with NiFi. Canvas The Canvas is the free grid space on which you create your Flow. It is accessed through the NiFi Web UI. You build Flows by dragging Processors on to the Canvas. Controller Service A Controller Service… Continue reading NiFi Terminology Basics
S3 Event Notifications in NiFi
The desire to pull newly uploaded files from storage is common, and typically the ListFile -> FetchFile pattern has been used in NiFi to monitor for, and then pull, new files as they arrive. Taking NiFi in to the cloud means that we’re often working with cloud object storage, like Amazon S3. While we can… Continue reading S3 Event Notifications in NiFi
Installing NiFi 1.14.0 on Linux (non-production)
This post is going to walk through installing the latest release of NiFi on a Linux host (Fedora). This latest release is version 1.14.0 and an important change is that NiFi is now secure by default. This means that HTTPS is enabled out of the box (with self signed certs), user authentication is required and… Continue reading Installing NiFi 1.14.0 on Linux (non-production)
Importing individual flow definitions in NiFi
While I recommend you Version Control & Deploy flows with NiFi Registry you can also quickly import flow definition json files straight from the NiFi GUI. This post will quickly demonstrate how. To get some json files to work with, clone my nifi-snippets repo that contains all of the NiFi flow demos that I have… Continue reading Importing individual flow definitions in NiFi
Building a simple REST API in NiFi
In a previous post I discussed using REST APIs to enrich records at the time of ingest. This post will cover building the corresponding REST API that I used in that post. This will be a very simple REST API that exposes a single endpoint GET /api. This endpoint returns a 200 OK response with… Continue reading Building a simple REST API in NiFi
Enriching Records with LookupRecord & REST APIs in NiFi
This is a pattern I have seen quite frequently, especially in IoT flows. At a high level: we have a stream of sensor data coming in from our IoT devices, and an external service that contains additional contextual data exposed via a REST API. With every sensor message, we want to call the REST API,… Continue reading Enriching Records with LookupRecord & REST APIs in NiFi
NiFi in Production – Version Control & Deploy flows with NiFi Registry
This post describes and demonstrates how to use NiFi and NiFi registry to develop flows in Dev, version control the flow, and then deploy the versioned flow to Prod.
NiFi Resources For Learning & Improving
It’s always a bit of a learning curve to get started with any new tool, not to mention keeping up to date with a tool that is under heavy active development. Here’s a list of invaluable resources to consult: NiFi Anti-Pattners by Mark Payne Mark Payne is the co-creator of NiFi and has a running… Continue reading NiFi Resources For Learning & Improving
Kafka with multiple Listeners and SASL
This will quickly discuss how to configure multiple Listeners, with the intent of having a unique Listener for External/Client traffic and another for Internal/Inter-broker traffic (and how this can be done with Cloudera Manager which requires a slight work-around in the current versions pre-2021). There’s several valid use cases for multiple Listeners. In this case,… Continue reading Kafka with multiple Listeners and SASL
Connecting to a secure Impala via NiFi with TLS and Kerberos (and Hive2)
There’s a few different ways this could be done. I’ll demonstrate one possible way, using ExecuteSQL to connect to Impala via the JDBC driver.