Kafka spout and define topology

This section will explain how we can read the Apache log from a Kafka topic. This section also defines the LogProcessingTopology that will chain together all the bolts created in the preceding sections. Let's perform the following steps to consume the data from Kafka and define the topology:

1. Add the following dependency and repository for Kafka in the pom.xml file:

       <dependency> 
             <groupId>org.apache.storm</groupId> 
             <artifactId>storm-kafka</artifactId> 
             <version>1.0.2</version> 
             <exclusions> 
                   <exclusion> 
                         <groupId>org.apache.kafka</groupId> 
                         <artifactId>kafka-clients</artifactId> 
                   </exclusion> 
       ...