Skip to main content

Properties File Lookup Augmentation of Data Flow in Apache NiFi

A really cool technologist contacted me on LinkedIn and asked an interesting question
Tim,
How do I read values from a properties file and use them in my flow. I want to update/inject an attribute with this value.
If you don't want to use the Variable Registry, but want to inject a value from a properties file how to do it. You could run some REST server and read it or does some file reading hack. But we have a great service to do this very easily!
In my UpdateAttribute (or in your regular attributes already), I have an attribute named, keytofind. This contains a lookup key such as an integer or a string key. We will find that value in the properties value and give you that in an attribute of your choosing.
We have a Controller Service to handle this for you. It reads from your specified properties file. Make sure Apache NiFi has permissions to that path and can read the file.

PropertiesFileLookupService
We lookup the key specified in the “keytofind”. It returns a value that you specify as an extra attribute, mine is “updatedvalue”.
This is my properties file:
  1. -rwxrwxrwx 1 tspann staff 67 Oct 4 09:15 lookup.properties
  2.  
  3. stuff1=value1
  4. stuff2=value2
  5. stuff3=value other
  6. tim=spann
  7. nifi=cool
In this example, we are using the LookupAttribute processor. You can also use the LookupRecord processor depending on your needs.
Resources:

Popular posts from this blog

Migrating Apache Flume Flows to Apache NiFi: Kafka Source to HDFS / Kudu / File / Hive

Migrating Apache Flume Flows to Apache NiFi: Kafka Source to HDFS / Kudu / File / HiveArticle 7 - https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_9.html Article 6 - https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_35.html
Article 5 - 
Article 4 - https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_8.html Article 3 - https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_7.html Article 2 - https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache.html Article 1https://www.datainmotion.dev/2019/08/migrating-apache-flume-flows-to-apache.html Source Code:  https://github.com/tspannhw/flume-to-nifi
This is one possible simple, fast replacement for "Flafka".



Consume / Publish Kafka And Store to Files, HDFS, Hive 3.1, Kudu

Consume Kafka Flow 

 Merge Records And Store As AVRO or ORC
Consume Kafka, Update Records via Machine Learning Models In CDSW And Store to Kudu

Sour…

Exploring Apache NiFi 1.10: Stateless Engine and Parameters

Exploring Apache NiFi 1.10:   Stateless Engine and Parameters Apache NiFi is now available in 1.10!
https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12316020&version=12344993

You can now use JDK 8 or JDK 11!   I am running in JDK 11, seems a bit faster.

A huge feature is the addition of Parameters!   And you can use these to pass parameters to Apache NiFi Stateless!

A few lesser Processors have been moved from the main download, see here for migration hints:
https://cwiki.apache.org/confluence/display/NIFI/Migration+Guidance

Release Notes:   https://cwiki.apache.org/confluence/display/NIFI/Release+Notes#ReleaseNotes-Version1.10.0

Example Source Code:https://github.com/tspannhw/stateless-examples

More New Features:

ParquetReader/Writer (See:  https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_7.html)Prometheus Reporting Task.   Expect more Prometheus stuff coming.Experimental Encrypted content repository.   People asked me for this one before.Par…

Ingesting Drone Data From DJII Ryze Tello Drones Part 1 - Setup and Practice

Ingesting Drone Data From DJII Ryze Tello Drones Part 1 - Setup and Practice In Part 1, we will setup our drone, our communication environment, capture the data and do initial analysis. We will eventually grab live video stream for object detection, real-time flight control and real-time data ingest of photos, videos and sensor readings. We will have Apache NiFi react to live situations facing the drone and have it issue flight commands via UDP. In this initial section, we will control the drone with Python which can be triggered by NiFi. Apache NiFi will ingest log data that is stored as CSV files on a NiFi node connected to the drone's WiFi. This will eventually move to a dedicated embedded device running MiniFi. This is a small personal drone with less than 13 minutes of flight time per battery. This is not a commercial drone, but gives you an idea of the what you can do with drones. Drone Live Communications for Sensor Readings and Drone Control You must connect to the drone…