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Fluentd

Fluentd Forward Protocol

The Fluentd Forward Protocol is a binary protocol used to transport event streams between Fluentd nodes and compatible agents over TCP. It supports multiple transport modes including Message, Forward, PackedForward, and CompressedPackedForward, and includes authentication and heartbeat mechanisms.

Documentation Provider Profile APIs.io AsyncAPI GitHub

Fluentd Forward Protocol is one of 3 APIs that Fluentd publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include Logging, Networking, and Protocol. The published artifact set on APIs.io includes API documentation, an API reference, and an AsyncAPI specification.

This event API exposes 2 operations across 2 channels, and defines 13 schemas. It is described by AsyncAPI 2.6.0, at version 1.0.0.

The API connects through a single server, tcp://localhost:24224 (tcp).

2 operations 2 channels 13 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
1.0.0
Server
tcp://localhost:24224 (tcp)
Contact
Fluentd Community
License
Apache 2.0
Resource Areas
1

Channels & Operations 2

Across 2 channels, the API surfaces 2 operations. Each is listed below with its action, channel, parameters, and response codes.

Channels 2
PUB
/forward
Forward one or more log events to a Fluentd aggregator
forwardEvents body
PUB
/heartbeat
Send a heartbeat packet
sendHeartbeat body

Messages & Schemas 13

The contract defines 13 schemas that model the data carried by its messages. The most detailed is OptionMap (3 properties). Each schema is shown below with its type and property counts.

MessageMode
message
A single log event with tag, timestamp, and record
ForwardMode
message
A batch of log events sharing a single tag
PackedForwardMode
message
A batch of pre-serialized log events as a raw MessagePack byte stream
CompressedPackedForwardMode
message
A gzip-compressed packed forward batch
Heartbeat
message
A UDP keepalive packet
MessageModePayload
array
A MessagePack array representing a single Fluentd event in Message mode: [tag, time, record] or [tag, time, record, option].
ForwardModePayload
array
A MessagePack array representing a batch of Fluentd events in Forward mode: [tag, entries, option].
PackedForwardModePayload
array
A MessagePack array representing a packed batch: [tag, entriesbytes, option]. entriesbytes is a raw binary sequence of MessagePack-encoded [time, record] pairs.
CompressedPackedForwardModePayload
array
Same as PackedForwardModePayload but the entries binary blob is gzip-compressed. The option map must contain {"compressed":"gzip"}.
Entry
array
A single event entry consisting of a timestamp and a record.
EventTime
object
Event timestamp. Can be a Unix epoch integer (seconds) or a Fluentd EventTime MessagePack extension type that carries both seconds and nanoseconds for sub-seco…
Record
object
The log record payload. An arbitrary key-value map where keys are strings and values can be any MessagePack-compatible type. The fields are defined by the emit…
OptionMap
object
Optional metadata map attached to a Forward Protocol message. Can carry acknowledgement chunk IDs, compression hints, and size hints.
3 properties

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

fluentd-forward-protocol-asyncapi.yml Raw ↑

Other APIs Fluentd publishes across the network.

Fluentd Plugin API
AE Profile APIs.io
Fluentd Events API
AE Profile APIs.io
#Logging#Networking#Protocol
← Back to F APIs
API Details
ID
fluentd:fluentd-forward-protocol
Server
tcp://localhost:24224 (tcp)
Docs
https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1
Provider
Fluentd
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