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node-red-contrib-cloudera

v0.0.3

Published

A collection of Node-RED nodes for integrating with Cloudera's software distribution including Apache Hadoop. Includes nodes for producing and consuming Apache Kafka messages, as well as Apache Avro serialization and deserialization.

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Links

Git

Maintainers

jcooperellisjcooperellis

Keywords

node-redclouderaapachehadoopkafkaavroproducerconsumer

Readme

node-red-contrib-cloudera

A collection of Node-RED nodes for integrating with Cloudera's software distribution including Apache Hadoop.

Installation

To install these nodes, you can either install it locally within your user data directory (by default, $HOME/.node-red):

cd $HOME/.node-red
npm install node-red-contrib-cloudera

or globally alongside Node-RED:

sudo npm install -g node-red-contrib-cloudera

You will need to restart Node-RED for it to pick-up the new nodes.

Node-RED Nodes

This package includes the following Node-RED nodes:

  • kafka producer
  • kafka consumer
  • avro

kafka producer

This node publishes the content of msg.payload as an Apache Kafka message.

See this node's "info" tab for more information about configuration, usage, and behavior.

Prerequisites

Using this node requires that you have Apache Kafka running properly along with Apache ZooKeeper, and a Kafka topic created.

kafka consumer

This node consumes Apache Kafka messages and outputs the message in msg.payload.

See this node's "info" tab for more information about configuration, usage, and behavior.

Prerequisites

Using this node requires that you have Apache Kafka running properly along with Apache ZooKeeper, a Kafka topic created, and messages being published to that topic.

Known Issues / Troubleshooting

  1. If you shut down Node-RED and quickly restart it you may see the error "FailedToRebalanceConsumerError: Exception: NODE_EXISTS[-110]" and the Kafka Consumer fail to initialize. This occurs when you attempt to create a Kafka Consumer with the same ID as a previously existing consumer before the ZooKeeper session for the previously existing consumer has timed out. Solutions to this can include stopping Node-RED and waiting for at least as long as the ZooKeeper session timeout, lowering the ZooKeeper session timeout, or providing a new, unique ID for the Kafka Consumer.

avro

This node allows for JavaScript Objects (and JSON strings) to be serialized as Apache Avro records, and for Apache Avro records to be deserialized as JavaScript Objects.

See this node's "info" tab for more information about configuration, usage, and behavior.

Prerequisites

Using this node requires that you have a valid Avro Schema for your records, or are able to write one.