The configuration file is a JSON format file where you specific the general properties to configure the normalizer instance. This file is different that stream config file that define the KS topology.

Example configuration file:

{
  "application.id": "ks-normalizer-app-id",
  "bootstrap.servers": "localhost:9092",
  "num.stream.threads": 1,
  "bootstrapper.classname": "io.wizzie.normalizer.builder.bootstrap.KafkaBootstrapper",
  "metric.enable": true,
  "metric.listeners": ["io.wizzie.metrics.listeners.ConsoleMetricListener"],
  "metric.interval": 60000,
  "multi.id": false
}

Property	Description	Default Value
application.id	This id is used to identify a group of normalizer instances. Normally this id is used to identify different clients.	-
bootstrap.servers	A list of host/port pairs to use for establishing the initial connection to the Kafka cluster. The client will make use of all servers irrespective of which servers are specified here for bootstrapping—this list only impacts the initial hosts used to discover the full set of servers. This list should be in the form host1:port1,host2:port2	-
num.stream.threads	The number of threads to execute stream processing.	1
bootstrapper.classname	The bootstrapper class reference. More info: Bootstrapper	-
metric.enable	Enable metrics system.	false
metric.listeners	Array with metrics listeners. More info: Metrics	[“io.wizzie.metrics.listeners.ConsoleMetricListener”]
metric.interval	Metric report interval (milliseconds)	60000
multi.id	This property is used when you have multiple normalizer instances with differences application.id and the normalizer uses the same topic names. More Info Multi Tenant	false
metric.enable	Enable metrics system.	false
max.kafka.output.topics	Max number of kafka topics that the normalizer can create to send data using the stream config	Integer.MAX_VALUE

Note: If you want to configure specific Kafka Streams properties, you can add these properties to this config file. The properties key.serde and value.serde will be overrwritten by normalizer.