Month: December 2019
18 posts
Joining collections in MongoDB
For the purposes of this article, I have created a collection called mongo2 and have furnished it with…
Simple Querying & Aggregation Of MongoDB Collections
Return all documents where one element in the array of likes is ‘burgers’ db.mongo.find({Likes : “burgers”}).forEach(printjson) Return documents…
Setting up MongoDB, creating a database, collection & inserting records
Getting started with MongoDB is pretty straight forward. The first thing to do is to setup a free…
Introduction to MongoDB
MongoDB is a document oriented database and is one of the leaders of the NoSQL revolution. To summarize…
Data Provenance in Apache NiFi
Understanding how your data came to be in its current form is critical for any kind of data…
Analyse the flow file at each step of the flow in Apache NiFi
Flow files, as we discussed in a previous article are basically the data that flows through your process.…
Using ExtractText Regex to select only matched records from input data
In many cases, we will want to route data based on its content. For example, it may be…
Box up your NiFi flows with process groups for easier management
When you’re developing several NiFi flows; it may be tempting to keep them all on the same top-level…
Generating dummy FlowFiles to test your NiFi flow
It is best practice to test that our flow works, before unleashing it (even in a test environment).…
Nifi Connectors- What Can I do?
There are so many connectors available through Apache NiFi. I won’t discuss them all here; however I do…