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stream-cardinality-excercise

Repo that represents my first interaction with kafka and streams and adventures to the world of Probabilistic algorithms - in this case measuring cardinality of an open set (streaming data).

Requirements

• Install golang
• Setup GOPATH
• Install dep

Buiding

• Clone this repository
• dep ensure
• cd cmd
• go build -o excercise

There is a Makefile available with make all. If you select this approach the binaries will be created in ./.gopath~/bin/. Not that you need to run dep ensure prior make all.

Running

• Run zookeper and kafka:

  brew services start zookeeper
  brew services start kafka
  

• Create a topic:

  kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic users
  

• Start console producer:

  kafka-console-producer --broker-list localhost:9092 --topic 'users' < ~/code/data/stream.jsonl
  

Before running just note that here processor is equivalent to consumer. I am using the slang of the library I am using to provide information.

• To run processor that just outputs the messages from kafka topic run

  # Using go run
  go run cmd/* processor-stdout --address localhost:9092 --topic users
  # Using binary
  ./.gopath~/bin/stream-cardinality-excercise processor-stdout --address localhost:9092 --topic users
  

• To run processor that can count by frame-per-rate method:

  # Using go run
  go run cmd/* processor-counter --address localhost:9092 --topic users --rate 1s --output-rate 5s --json 1
  # Using binary
  ./.gopath~/bin/stream-cardinality-excercise processor-counter --address localhost:9092 --topic users --rate 1s --output-rate 5s --json 1
  
  

• To run processor that counts unique users per minute run:

# Using go run
go run cmd/* processor-user --address localhost:9092 --topic users

# Using binary
./.gopath~/bin/stream-cardinality-excercise processor-user --address localhost:9092

More about the CLI. Note that this projects builds in a single CLI. Here is a preview of the options that are available to the caller

➜ .gopath\~/bin/stream-cardinality-excercise
Demonstration of stream cardinality estimation using data that is streamed from kafka.

Usage:
  stream-cardinality-excercise [command]

Available Commands:
  help              Help about any command
  processor-counter Process messages and outputs the frame-per-rate stats
  processor-stdout  Process messages and outputs them to os.Stdout
  processor-user    Process messages and count unique users per minute

Flags:
  -a, --address string   Kafka address
  -h, --help             help for stream-cardinality-excercise
  -t, --topic string     Kafka topic

Use "stream-cardinality-excercise [command] --help" for more information about a command.

Notes, Benchmarks, Thoughts

Available here