Kafka Emitter
To use this Apache Druid extension, include kafka-emitter in the extensions load list.
Introduction
This extension emits Druid metrics to Apache Kafka directly with JSON format.
Currently, Kafka has not only their nice ecosystem but also consumer API readily available.
So, If you currently use Kafka, It's easy to integrate various tool or UI
to monitor the status of your Druid cluster with this extension.
Configuration
All the configuration parameters for the Kafka emitter are under druid.emitter.kafka.
| Property | Description | Required | Default |
|---|---|---|---|
druid.emitter.kafka.bootstrap.servers | Comma-separated Kafka broker. ([hostname:port],[hostname:port]...) | yes | none |
druid.emitter.kafka.event.types | Comma-separated event types. Supported types are alerts, metrics, requests, and segment_metadata. | no | ["metrics", "alerts"] |
druid.emitter.kafka.metric.topic | Kafka topic name for emitter's target to emit service metrics. If event.types contains metrics, this field cannot be empty. | no | none |
druid.emitter.kafka.alert.topic | Kafka topic name for emitter's target to emit alerts. If event.types contains alerts, this field cannot empty. | no | none |
druid.emitter.kafka.request.topic | Kafka topic name for emitter's target to emit request logs. If event.types contains requests, this field cannot be empty. | no | none |
druid.emitter.kafka.segmentMetadata.topic | Kafka topic name for emitter's target to emit segment metadata. If event.types contains segment_metadata, this field cannot be empty. | no | none |
druid.emitter.kafka.producer.config | JSON configuration to set additional properties to Kafka producer. | no | none |
druid.emitter.kafka.clusterName | Optional value to specify the name of your Druid cluster. It can help make groups in your monitoring environment. | no | none |
druid.emitter.kafka.extra.dimensions | Optional JSON configuration to specify a map of extra string dimensions for the events emitted. These can help make groups in your monitoring environment. | no | none |
druid.emitter.kafka.producer.hiddenProperties | JSON configuration to specify sensitive Kafka producer properties such as username and password. This property accepts a DynamicConfigProvider implementation. | no | none |
Example
druid.emitter.kafka.bootstrap.servers=hostname1:9092,hostname2:9092
druid.emitter.kafka.event.types=["metrics", alerts", "requests", "segment_metadata"]
druid.emitter.kafka.metric.topic=druid-metric
druid.emitter.kafka.alert.topic=druid-alert
druid.emitter.kafka.request.topic=druid-request-logs
druid.emitter.kafka.segmentMetadata.topic=druid-segment-metadata
druid.emitter.kafka.producer.config={"max.block.ms":10000}
druid.emitter.kafka.extra.dimensions={"region":"us-east-1","environment":"preProd"}
druid.emitter.kafka.producer.hiddenProperties={"config":{"sasl.jaas.config": "org.apache.kafka.common.security.plain.PlainLoginModule required username=\\"KV...NI\\" password=\\"gA3...n6a/\\";"}}