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[[metricbeat-module-kafka]]
== Kafka module

This is the Kafka module.

The default metricsets are `consumergroup` and `partition`.

If authorization is configured in the Kafka cluster, the following ACLs are
required for the Metricbeat user:

* READ Topic, for the topics to be monitored
* DESCRIBE Group, for the groups to be monitored

For example, if the `stats` user is being used for Metricbeat, to monitor all
topics and all consumer groups, ACLS can be granted with the following commands:

[source,shell]
-----
kafka-acls --authorizer-properties zookeeper.connect=localhost:2181 --add --allow-principal User:stats --operation Read --topic '*'
kafka-acls --authorizer-properties zookeeper.connect=localhost:2181 --add --allow-principal User:stats --operation Describe --group '*'
-----

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=== Compatibility

This module is tested with Kafka 0.10.2.1, 1.1.0, 2.1.1, and 2.2.2.

The Broker, Producer, Consumer metricsets require <<metricbeat-module-jolokia,Jolokia>> to fetch JMX metrics. Refer to the link for Jolokia's compatibility notes.

[float]
=== Usage
The Broker, Producer, Consumer metricsets require <<metricbeat-module-jolokia,Jolokia>> to fetch JMX metrics. Refer to those Metricsets' documentation about how to use Jolokia.


[float]
=== Dashboard

The Kafka module comes with a predefined dashboard. For example:

image::./images/metricbeat_kafka_dashboard.png[]


[float]
=== Example configuration

The Kafka module supports the standard configuration options that are described
in <<configuration-metricbeat>>. Here is an example configuration:

[source,yaml]
----
metricbeat.modules:
# Kafka metrics collected using the Kafka protocol
- module: kafka
  #metricsets:
  #  - partition
  #  - consumergroup
  period: 10s
  hosts: ["localhost:9092"]

  #client_id: metricbeat
  #retries: 3
  #backoff: 250ms

  # List of Topics to query metadata for. If empty, all topics will be queried.
  #topics: []

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  #ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]

  # Certificate for SSL client authentication
  #ssl.certificate: "/etc/pki/client/cert.pem"

  # Client Certificate Key
  #ssl.key: "/etc/pki/client/cert.key"

  # Client Certificate Passphrase (in case your Client Certificate Key is encrypted)
  #ssl.key_passphrase: "yourKeyPassphrase"

  # SASL authentication
  #username: ""
  #password: ""

# Metrics collected from a Kafka broker using Jolokia
#- module: kafka
#  metricsets:
#    - broker
#  period: 10s
#  hosts: ["localhost:8779"]

# Metrics collected from a Java Kafka consumer using Jolokia
#- module: kafka
#  metricsets:
#    - consumer
#  period: 10s
#  hosts: ["localhost:8774"]

# Metrics collected from a Java Kafka producer using Jolokia
#- module: kafka
#  metricsets:
#    - producer
#  period: 10s
#  hosts: ["localhost:8775"]
----

[float]
=== Metricsets

The following metricsets are available:

* <<metricbeat-metricset-kafka-broker,broker>>

* <<metricbeat-metricset-kafka-consumer,consumer>>

* <<metricbeat-metricset-kafka-consumergroup,consumergroup>>

* <<metricbeat-metricset-kafka-partition,partition>>

* <<metricbeat-metricset-kafka-producer,producer>>

include::kafka/broker.asciidoc[]

include::kafka/consumer.asciidoc[]

include::kafka/consumergroup.asciidoc[]

include::kafka/partition.asciidoc[]

include::kafka/producer.asciidoc[]

