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Divyaksh
Divyaksh

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Installing Apache Kafka (Confluent edition)

#tutorial #machinelearning #beginners

Table of Contents

Download 

curl -O http://packages.confluent.io/archive/5.4/confluent-community-5.4.0-2.12.zip
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1. Start zookeeper

Navigate to the folder where confluent is installed. For me it was /home/divyaksh/Downloads/software/confluent-5.4.0

Linux

bin/zookeeper-server-start etc/kafka/zookeeper.properties
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Windows

bin\windows\zookeeper-server-start.bat etc\kafka\zookeeper.properties
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Error

Occurs if something is missing. I don't know what do do if this happens in linux.

Classpath is empty. Please build the project first using 'gradlew jarAll'
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Solution

  • Go to bin/kafka-run-class
  • Add some code. Go to a line above this script (do not delete anything) 
rem Classpath addition for core
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add the below code

rem Classpath addition for LSB style path
if exist %BASE_DIR%\share\java\kafka\* (
    call :concat %BASE_DIR%\share\java\kafka\*
)
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2. Create a Kafka Broker

Linux

bin/kafka-server-start etc/kafka/server.properties
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Windows

bin\windows\kafka-server-start.bat etc\kafka\server.properties
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3. Create a Kafka topic

Linux

bin/kafka-topics --create --topic sampleTopic --partitions 1 --replication-factor 1 --bootstrap-server localhost:9092
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Windows

bin\windows\kafka-topics.bat --create --topic sampleTopic --partitions 1 --replication-factor 1 --bootstrap-server localhost:9092
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Warning

WARNING: Due to limitations in metric names, topics with a period ('.') or underscore ('_') could collide. To avoid issues it is best to use either, but not both
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Thus, create topics with names not haveing . or _.

--partition n:

  • Number of partitions
    • How much storage is needed (how big my message is)
    • Nature of parallel processing

Here we have a simple workload of a single producer and a single consumer (n = 1)

--replication-factor f : number of copies of each partition in the cluster. You create multiple brokers and a in each you make a copy of the messages. Higher the replication factor, more number of copies. No sense of keeping f=10 when there is only 1 broker. in our example f = 1

--bootstrap-server: it takes 2 arguments ip-address and port-number. In our example we are running the zookeeper on local machine and the default port number of zookeeper is 9092.

Listing the topics 

$ bin/kafka-topics --list --bootstrap-server localhost:9092
__confluent.support.metrics
sampleTopic
sample_topic
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4. Create a Kafka Producer

Linux

bin/kafka-console-producer --topic sampleTopic --broker-list localhost:9092  < <path to some file>
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Windows

bin\windows\kafka-console-producer.bat --topic sampleTopic --broker-list localhost:9092 < <path to some file>
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--broker-list: same as --bootstrap-server.

NOTICE

$ bin/kafka-console-producer --help
This tool helps to read data from standard input and publish it to Kafka.
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So you have to input the file using < operator before giving <path to some file>

5. Create a Kafka Consumer

Linux

bin/kafka-console-consumer --topic sampleTopic --bootstrap-server localhost:9092 -from-beginning
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Windows

bin\windows\kafka-console-consumer.bat --topic sampleTopic --bootstrap-server localhost:9092 -from-beginning
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OUTPUT

$ bin/kafka-console-consumer --topic sampleTopic --bootstrap-server localhost:9092 -from-beginning
To: divyaksh.shukla@gmail.com
From: ideapad.divyaksh@gmail.com
Subject: This is a test email from msmtp

MSMTP says hello
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I had given a test email file as an input to the producer.

LOGS (DEBUG)

You can find the logs at /tmp/kafka-logs/ to debug kafka. Windows C:\tmp\kafka-logs\

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