The Kafka output sends events to Apache Kafka.
Compatibility: This output can connect to Kafka version 0.8.2.0 and later. Older versions might work as well, but are not supported.
This example configures a Kafka output called kafka-output in the {agent}
elastic-agent.yml file, with settings as described further in:
outputs:
kafka-output:
type: kafka
hosts:
- 'kafka1:9092'
- 'kafka2:9092'
- 'kafka3:9092'
client_id: Elastic
version: 1.0.0
compression: gzip
compression_level: 4
username: <my-kafka-username>
password: <my-kakfa-password>
sasl:
mechanism: SCRAM-SHA-256
partition:
round_robin:
group_events: 1
topic: 'elastic-agent'
headers: []
timeout: 30
broker_timeout: 30
required_acks: 1
ssl:
verification_mode: fullThe kafka output supports the following settings, grouped by category.
Many of these settings have sensible defaults that allow you to run {agent} with
minimal configuration.
Setting |
Description |
|
The addresses your {agent}s will use to connect to one or more Kafka brokers. Following is an example hosts:
- 'localhost:9092'
- 'mykafkahost01:9092'
- 'mykafkahost02:9092' |
|
Kafka protocol version that {agent} will request when connecting. Defaults to 1.0.0. The protocol version controls the Kafka client features available to {agent}; it does not prevent {agent} from connecting to Kafka versions newer than the protocol version. |
| Setting | Description |
|---|---|
|
The username for connecting to Kafka. If username is configured, the password must be configured as well. |
|
The password for connecting to Kafka. |
|
The SASL mechanism to use when connecting to Kafka. It can be one of:
|
|
When sending data to a secured cluster through the |
The memory queue keeps all events in memory.
The memory queue waits for the output to acknowledge or drop events. If the queue is full, no new events can be inserted into the memory queue. Only after the signal from the output will the queue free up space for more events to be accepted.
The memory queue is controlled by the parameters queue.mem.flush.min_events and flush.timeout. If
flush.timeout is 0s or queue.mem.flush.min_events is 0 or 1 then events can be sent by the output as
soon as they are available. If the output supports a bulk_max_size parameter it controls the
maximum batch size that can be sent.
If queue.mem.flush.min_events is greater than 1 and flush.timeout is greater than 0s, events will only
be sent to the output when the queue contains at least queue.mem.flush.min_events events or the
flush.timeout period has expired. In this mode the maximum size batch that that can be sent by the
output is queue.mem.flush.min_events. If the output supports a bulk_max_size parameter, values of
bulk_max_size greater than queue.mem.flush.min_events have no effect. The value of queue.mem.flush.min_events
should be evenly divisible by bulk_max_size to avoid sending partial batches to the output.
This sample configuration forwards events to the output if 512 events are available or the oldest available event has been waiting for 5s in the queue:
queue.mem.events: 4096
queue.mem.flush.min_events: 512
queue.mem.flush.timeout: 5sSetting |
Use these options to set the Kafka topic for each {agent} event.
| Setting | Description |
|---|---|
|
The default Kafka topic used for produced events. |
The number of partitions created is set automatically by the Kafka broker based on the list of topics. Records are then published to partitions either randomly, in round-robin order, or according to a calculated hash.
In the following example, after each event is published to a partition, the partitioner selects the next partition in round-robin fashion.
partition:
round_robin:
group_events: 1| Setting | Description |
|---|---|
|
Sets the number of events to be published to the same partition, before the partitioner selects a new partition by random. The default value is 1 meaning after each event a new partition is picked randomly. |
|
Sets the number of events to be published to the same partition, before the partitioner selects the next partition. The default value is 1 meaning after each event the next partition will be selected. |
|
List of fields used to compute the partitioning hash value from. If no field is configured, the events key value will be used. |
|
Randomly distribute events if no hash or key value can be computed. |
A header is a key-value pair, and multiple headers can be included with the same key. Only string values are supported. These headers will be included in each produced Kafka message.
| Setting | Description |
|---|---|
|
The key to set in the Kafka header. |
|
The value to set in the Kafka header. |
|
The configurable ClientID used for logging, debugging, and auditing purposes. The default is |
You can specify these various other options in the kafka-output section of the agent configuration file.
| Setting | Description |
|---|---|
|
(string) The number of seconds to wait before trying to reconnect to Kafka
after a network error. After waiting Default: |
|
(string) The maximum number of seconds to wait before attempting to connect to Kafka after a network error. Default: |
|
The maximum length of time a Kafka broker waits for the required number of ACKs before timing out (see the Default: |
|
(int) Duration to wait before sending bulk Kafka request. Default: |
|
(int) The maximum number of events to bulk in a single Kafka request. Default: |
|
(int) Per Kafka broker number of messages buffered in output pipeline. Default: |
|
Output codec configuration. You can specify either the
Example configuration that uses the output.console:
codec.json:
pretty: true
escape_html: false
Example configurable that uses the output.console:
codec.format:
string: '%{[@timestamp]} %{[message]}' |
|
Select a compression codec to use. Supported codecs are |
|
For the Increasing the compression level reduces the network usage but increases the CPU usage. Default: |
|
(string) The keep-alive period for an active network connection. If Default: |
|
(int) The maximum permitted size of JSON-encoded messages. Bigger messages will be dropped. This value should be equal to or less than the broker’s Default: |
|
Kafka metadata update settings. The metadata contains information about brokers, topics, partition, and active leaders to use for publishing.
|
|
The ACK reliability level required from broker. 0=no response, 1=wait for local commit, -1=wait for all replicas to commit. The default is 1. Note: If set to 0, no ACKs are returned by Kafka. Messages might be lost silently on error. Default: |
|
The number of seconds to wait for responses from the Kafka brokers before timing out. The default is 30 (seconds). Default: |