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input: kafka: Document data_format option #1118

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Jan 4, 2024
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input: kafka: Document data_format option #1118

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input: kafka: Document `data_format` option
tchrono May 29, 2023
cfa3006
Rename data_format to format
tchrono Jul 20, 2023
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4 changes: 4 additions & 0 deletions pipeline/inputs/kafka.md
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Expand Up @@ -9,6 +9,7 @@ This plugin uses the official [librdkafka C library](https:/edenhill
| :--- | :--- | :--- |
| brokers | Single or multiple list of Kafka Brokers, e.g: 192.168.1.3:9092, 192.168.1.4:9092. | |
| topics | Single entry or list of topics separated by comma \(,\) that Fluent Bit will subscribe to. | |
| format | Serialization format of the messages. If set to "json", the payload will be parsed as json. | none |
| client\_id | Client id passed to librdkafka. | |
| group\_id | Group id passed to librdkafka. | fluent-bit |
| poll\_ms | Kafka brokers polling interval in milliseconds. | 500 |
Expand Down Expand Up @@ -51,6 +52,7 @@ The fluent-bit source repository contains a full example of using fluent-bit to
brokers kafka-broker:9092
topics fb-source
poll_ms 100
format json

[FILTER]
Name lua
Expand All @@ -66,6 +68,8 @@ The fluent-bit source repository contains a full example of using fluent-bit to

The above will connect to the broker listening on `kafka-broker:9092` and subscribe to the `fb-source` topic, polling for new messages every 100 milliseconds.

Since the payload will be in json format, we ask the plugin to automatically parse the payload with `format json`.

Every message received is then processed with `kafka.lua` and sent back to the `fb-sink` topic of the same broker.

The example can be executed locally with `make start` in the `examples/kafka_filter` directory (docker/compose is used).