Kafka plugin

It reads events from multiple Kafka topics using franz-go library.

It guarantees at "at-least-once delivery" due to the commitment mechanism.

Example Standard example:

pipelines:
  example_pipeline:
    input:
      type: kafka
      brokers: [kafka:9092, kafka:9091]
      topics: [topic1, topic2]
      offset: newest
      meta:
        partition: '{{ .partition }}'
        topic: '{{ .topic }}'
        offset: '{{ .offset }}'
    # output plugin is not important in this case, let's emulate s3 output.
    output:
      type: s3
      file_config:
        retention_interval: 10s
      endpoint: "s3.fake_host.org:80"
      access_key: "access_key1"
      secret_key: "secret_key2"
      bucket: "bucket-logs"
      bucket_field_event: "bucket_name"

Config params

brokers []string required

The name of kafka brokers to read from.

topics []string required

The list of kafka topics to read from.

consumer_group string default=file-d

The name of consumer group to use.

client_id string default=file-d

Kafka client ID.

channel_buffer_size int default=256

The number of unprocessed messages in the buffer that are loaded in the background from kafka. (max.poll.records)

max_concurrent_consumers int default=5 MaxConcurrentConsumers sets the maximum number of consumers Optimal value: number of topics * number of partitions of topic

max_concurrent_fetches int default=0

MaxConcurrentFetches sets the maximum number of fetch requests to allow in flight or buffered at once, overriding the unbounded (i.e. number of brokers) default.

fetch_max_bytes cfg.Expression default=52428800

FetchMaxBytes (fetch.max.bytes) sets the maximum amount of bytes a broker will try to send during a fetch

fetch_min_bytes cfg.Expression default=1

FetchMinBytes (fetch.min.bytes) sets the minimum amount of bytes a broker will try to send during a fetch

offset string default=newest options=newest|oldest

The newest and oldest values is used when a consumer starts but there is no committed offset for the assigned partition.

• newest - set offset to the newest message
• oldest - set offset to the oldest message

balancer string default=round-robin options=round-robin|range|sticky|cooperative-sticky

Algorithm used by Kafka to assign partitions to consumers in a group.

• round-robin - M0: [t0p0, t0p2, t1p1], M1: [t0p1, t1p0, t1p2]
• range - M0: [t0p0, t0p1, t1p0, t1p1], M1: [t0p2, t1p2]
• sticky - ensures minimal partition movement on group changes while also ensuring optimal balancing
• cooperative-sticky - performs the sticky balancing strategy, but additionally opts the consumer group into "cooperative" rebalancing

consumer_max_processing_time cfg.Duration default=200ms

The maximum amount of time the consumer expects a message takes to process for the user. (Not used anymore!)

consumer_max_wait_time cfg.Duration default=250ms

The maximum amount of time the broker will wait for Consumer.Fetch.Min bytes to become available before it returns fewer than that anyways. (fetch.max.wait.ms)

auto_commit_interval cfg.Duration default=1s

AutoCommitInterval sets how long to go between autocommits

session_timeout cfg.Duration default=10s

SessionTimeout sets how long a member in the group can go between heartbeats

heartbeat_interval cfg.Duration default=3s

HeartbeatInterval sets how long a group member goes between heartbeats to Kafka

is_sasl_enabled bool default=false

If set, the plugin will use SASL authentications mechanism.

sasl_mechanism string default=SCRAM-SHA-512 options=PLAIN|SCRAM-SHA-256|SCRAM-SHA-512|AWS_MSK_IAM|OAUTHBEARER

SASL mechanism to use.

sasl_username string default=user

SASL username.

sasl_password string default=password

SASL password.

sasl_oauth cfg.KafkaClientOAuthConfig

SASL OAUTHBEARER config. It works only if sasl_mechanism:"OAUTHBEARER".

There are 2 options - a static token or a dynamically updated.

OAuthConfig params:

• token string - static token

• client_id string - client ID

• client_secret string - client secret

• token_url string - resource server's token endpoint URL

• scopes []string - optional requested permissions

• auth_style string default=params options=params|header - specifies how the endpoint wants the client ID & client secret sent

• tls TLSConfig - tls config

TLSConfig params:

• ca_cert string - path or content of a PEM-encoded CA file
• client_cert string - path or content of a PEM-encoded client certificate file
• client_key string - path or content of a PEM-encoded client key file
• insecure bool - if set, the token issuer will skip SSL/TLS verification

is_ssl_enabled bool default=false

If set, the plugin will use SSL/TLS connections method.

ssl_skip_verify bool default=false

If set, the plugin will skip SSL/TLS verification.

client_cert string

Path or content of a PEM-encoded client certificate file.

client_key string

Path or content of a PEM-encoded client key file.

ca_cert string

Path or content of a PEM-encoded CA file.

meta cfg.MetaTemplates

Meta params

Add meta information to an event (look at Meta params) Use go-template syntax

Example: topic: '{{ .topic }}'

Meta params

topic

partition

offset
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