Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The --topic parameter sets the name of the topic; in this case, amazingTopic."

A block of code is set as follows:

{
   "event": "CUSTOMER_CONSULTS_ETHPRICE",
   "customer": {
         "id": "14862768",
         "name": "Snowden, Edward",
         "ipAddress": "95.31.18.111"
   },
   "currency": {
         "name": "ethereum",
         "price": "RUB"
   },
   "timestamp": "2018-09-28T09:09:09Z"
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

dependencies {
    compile group: 'org.apache.kafka', name: 'kafka_2.12', version:                                                             
                                                          '2.0.0'
    compile group: 'com.maxmind.geoip', name: 'geoip-api', version: 
                                                          '1.3.1'
    compile group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.9.7'
}

Any command-line input or output is written as follows:

> <confluent-path>/bin/kafka-topics.sh --list --ZooKeeper localhost:2181

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "To differentiate among them, the events on t1 have one stripe, the events on t2 have two stripes, and the events on t3 have three stripes."