kafka_franz

BETA

This component is mostly stable but breaking changes could still be made outside of major version releases if a fundamental problem with the component is found.

A Kafka input using the Franz Kafka client library.

Introduced in version 1.0.0.

Common
Advanced

# Common config fields, showing default values
input:
  label: ""
  kafka_franz:
    seed_brokers: [] # No default (required)
    topics: [] # No default (required)
    regexp_topics: false
    consumer_group: "" # No default (optional)
    auto_replay_nacks: true

# All config fields, showing default values
input:
  label: ""
  kafka_franz:
    seed_brokers: [] # No default (required)
    topics: [] # No default (required)
    regexp_topics: false
    consumer_group: "" # No default (optional)
    client_id: bento
    rack_id: ""
    checkpoint_limit: 1024
    auto_replay_nacks: true
    commit_period: 5s
    start_from_oldest: true
    group_balancers:
      - cooperative_sticky
    metadata_max_age: 5m
    fetch_max_bytes: 50MiB
    fetch_max_partition_bytes: 1MiB
    fetch_max_wait: 5s
    preferring_lag: 0 # No default (optional)
    tls:
      enabled: false
      skip_cert_verify: false
      enable_renegotiation: false
      root_cas: ""
      root_cas_file: ""
      client_certs: []
    sasl: [] # No default (optional)
    multi_header: false
    batching:
      count: 0
      byte_size: 0
      period: ""
      jitter: 0
      check: ""
      processors: [] # No default (optional)

When a consumer group is specified this input consumes one or more topics where partitions will automatically balance across any other connected clients with the same consumer group. When a consumer group is not specified topics can either be consumed in their entirety or with explicit partitions.

This input often out-performs the traditional kafka input as well as providing more useful logs and error messages.

Metadata

This input adds the following metadata fields to each message:

- kafka_key
- kafka_topic
- kafka_partition
- kafka_offset
- kafka_timestamp_unix
- kafka_tombstone_message
- All record headers

Fields

`seed_brokers`

A list of broker addresses to connect to in order to establish connections. If an item of the list contains commas it will be expanded into multiple addresses.

Type: array

# Examples

seed_brokers:
  - localhost:9092

seed_brokers:
  - foo:9092
  - bar:9092

seed_brokers:
  - foo:9092,bar:9092

`topics`

A list of topics to consume from. Multiple comma separated topics can be listed in a single element. When a consumer_group is specified partitions are automatically distributed across consumers of a topic, otherwise all partitions are consumed.

Alternatively, it's possible to specify explicit partitions to consume from with a colon after the topic name, e.g. foo:0 would consume the partition 0 of the topic foo. This syntax supports ranges, e.g. foo:0-10 would consume partitions 0 through to 10 inclusive.

Finally, it's also possible to specify an explicit offset to consume from by adding another colon after the partition, e.g. foo:0:10 would consume the partition 0 of the topic foo starting from the offset 10. If the offset is not present (or remains unspecified) then the field start_from_oldest determines which offset to start from.

Type: array

# Examples

topics:
  - foo
  - bar

topics:
  - things.*

topics:
  - foo,bar

topics:
  - foo:0
  - bar:1
  - bar:3

topics:
  - foo:0,bar:1,bar:3

topics:
  - foo:0-5

`regexp_topics`

Whether listed topics should be interpreted as regular expression patterns for matching multiple topics. When topics are specified with explicit partitions this field must remain set to false.

Type: bool
Default: false

`consumer_group`

An optional consumer group to consume as. When specified the partitions of specified topics are automatically distributed across consumers sharing a consumer group, and partition offsets are automatically committed and resumed under this name. Consumer groups are not supported when specifying explicit partitions to consume from in the topics field.

Type: string

`client_id`

An identifier for the client connection.

Type: string
Default: "bento"

`rack_id`

A rack identifier for this client.

Type: string
Default: ""

`checkpoint_limit`

Determines how many messages of the same partition can be processed in parallel before applying back pressure. When a message of a given offset is delivered to the output the offset is only allowed to be committed when all messages of prior offsets have also been delivered, this ensures at-least-once delivery guarantees. However, this mechanism also increases the likelihood of duplicates in the event of crashes or server faults, reducing the checkpoint limit will mitigate this.

Type: int
Default: 1024

`auto_replay_nacks`

Whether messages that are rejected (nacked) at the output level should be automatically replayed indefinitely, eventually resulting in back pressure if the cause of the rejections is persistent. If set to false these messages will instead be deleted. Disabling auto replays can greatly improve memory efficiency of high throughput streams as the original shape of the data can be discarded immediately upon consumption and mutation.

Type: bool
Default: true

`commit_period`

The period of time between each commit of the current partition offsets. Offsets are always committed during shutdown.

Type: string
Default: "5s"

`start_from_oldest`

Determines whether to consume from the oldest available offset, otherwise messages are consumed from the latest offset. The setting is applied when creating a new consumer group or the saved offset no longer exists.

Type: bool
Default: true

`group_balancers`

Balancers sets the group balancers to use for dividing topic partitions among group members. This option is equivalent to Kafka's partition.assignment.strategies option.

Type: array
Default: ["cooperative_sticky"]

`metadata_max_age`

This sets the maximum age for the client's cached metadata, to allow detection of new topics, partitions, etc.

Type: string
Default: "5m"

`fetch_max_bytes`

This sets the maximum amount of bytes a broker will try to send during a fetch. Note that brokers may not obey this limit if it has records larger than this limit. Also note that this client sends a fetch to each broker concurrently, meaning the client will buffer up to <brokers * max bytes> worth of memory. Equivalent to Kafka's fetch.max.bytes option.

Type: string
Default: "50MiB"

`fetch_max_partition_bytes`

Sets the maximum amount of bytes that will be consumed for a single partition in a fetch request. Note that if a single batch is larger than this number, that batch will still be returned so the client can make progress. Equivalent to Kafka's max.partition.fetch.bytes option.

Type: string
Default: "1MiB"

`fetch_max_wait`

This sets the maximum amount of time a broker will wait for a fetch response to hit the minimum number of required bytes before returning, overriding the default 5s.

Type: string
Default: "5s"

`preferring_lag`

This allows you to re-order partitions before they are fetched, given each partition's current lag.

By default, the client rotates partitions fetched by one after every fetch request. Kafka answers fetch requests in the order that partitions are requested, filling the fetch response untilfetch_max_bytes and fetch_max_partition_bytes are hit. All partitions eventually rotate to the front, ensuring no partition is starved.

With this option, you can return topic order and per-topic partition ordering. These orders will sort to the front (first by topic, then by partition). Any topic or partitions that you do not return are added to the end, preserving their original ordering.

Type: int

`tls`

Custom TLS settings can be used to override system defaults.

Type: object

`tls.enabled`

Whether custom TLS settings are enabled.

Type: bool
Default: false

`tls.skip_cert_verify`

Whether to skip server side certificate verification.

Type: bool
Default: false

`tls.enable_renegotiation`

Whether to allow the remote server to repeatedly request renegotiation. Enable this option if you're seeing the error message local error: tls: no renegotiation.

Type: bool
Default: false
Requires version 1.0.0 or newer

`tls.root_cas`

An optional root certificate authority to use. This is a string, representing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

# Examples

root_cas: |-
  -----BEGIN CERTIFICATE-----
  ...
  -----END CERTIFICATE-----

`tls.root_cas_file`

An optional path of a root certificate authority file to use. This is a file, often with a .pem extension, containing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Type: string
Default: ""

# Examples

root_cas_file: ./root_cas.pem

`tls.client_certs`

A list of client certificates to use. For each certificate either the fields cert and key, or cert_file and key_file should be specified, but not both.

Type: array
Default: []

# Examples

client_certs:
  - cert: foo
    key: bar

client_certs:
  - cert_file: ./example.pem
    key_file: ./example.key

`tls.client_certs[].cert`

A plain text certificate to use.

Type: string
Default: ""

`tls.client_certs[].key`

A plain text certificate key to use.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

`tls.client_certs[].cert_file`

The path of a certificate to use.

Type: string
Default: ""

`tls.client_certs[].key_file`

The path of a certificate key to use.

Type: string
Default: ""

`tls.client_certs[].password`

A plain text password for when the private key is password encrypted in PKCS#1 or PKCS#8 format. The obsolete pbeWithMD5AndDES-CBC algorithm is not supported for the PKCS#8 format. Warning: Since it does not authenticate the ciphertext, it is vulnerable to padding oracle attacks that can let an attacker recover the plaintext.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

# Examples

password: foo

password: ${KEY_PASSWORD}

`sasl`

Specify one or more methods of SASL authentication. SASL is tried in order; if the broker supports the first mechanism, all connections will use that mechanism. If the first mechanism fails, the client will pick the first supported mechanism. If the broker does not support any client mechanisms, connections will fail.

Type: array

# Examples

sasl:
  - mechanism: SCRAM-SHA-512
    password: bar
    username: foo

`sasl[].mechanism`

The SASL mechanism to use.

Type: string

Option	Summary
`AWS_MSK_IAM`	AWS IAM based authentication as specified by the 'aws-msk-iam-auth' java library.
`OAUTHBEARER`	OAuth Bearer based authentication.
`PLAIN`	Plain text authentication.
`SCRAM-SHA-256`	SCRAM based authentication as specified in RFC5802.
`SCRAM-SHA-512`	SCRAM based authentication as specified in RFC5802.
`none`	Disable sasl authentication

`sasl[].username`

A username to provide for PLAIN or SCRAM-* authentication.

Type: string
Default: ""

`sasl[].password`

A password to provide for PLAIN or SCRAM-* authentication.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

`sasl[].token`

The token to use for a single session's OAUTHBEARER authentication.

Type: string
Default: ""

`sasl[].extensions`

Key/value pairs to add to OAUTHBEARER authentication requests.

Type: object

`sasl[].aws`

Contains AWS specific fields for when the mechanism is set to AWS_MSK_IAM.

Type: object

`sasl[].aws.region`

The AWS region to target.

Type: string
Default: ""

`sasl[].aws.endpoint`

Allows you to specify a custom endpoint for the AWS API.

Type: string
Default: ""

`sasl[].aws.credentials`

Optional manual configuration of AWS credentials to use. More information can be found in this document.

Type: object

`sasl[].aws.credentials.profile`

A profile from ~/.aws/credentials to use.

Type: string
Default: ""

`sasl[].aws.credentials.id`

The ID of credentials to use.

Type: string
Default: ""

`sasl[].aws.credentials.secret`

The secret for the credentials being used.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

`sasl[].aws.credentials.token`

The token for the credentials being used, required when using short term credentials.

Type: string
Default: ""

`sasl[].aws.credentials.from_ec2_role`

Use the credentials of a host EC2 machine configured to assume an IAM role associated with the instance.

Type: bool
Default: false
Requires version 1.0.0 or newer

`sasl[].aws.credentials.role`

A role ARN to assume.

Type: string
Default: ""

`sasl[].aws.credentials.role_external_id`

An external ID to provide when assuming a role.

Type: string
Default: ""

`multi_header`

Decode headers into lists to allow handling of multiple values with the same key

Type: bool
Default: false

`batching`

Allows you to configure a batching policy that applies to individual topic partitions in order to batch messages together before flushing them for processing. Batching can be beneficial for performance as well as useful for windowed processing, and doing so this way preserves the ordering of topic partitions.

Type: object

# Examples

batching:
  byte_size: 5000
  count: 0
  period: 1s

batching:
  count: 10
  period: 1s

batching:
  check: this.contains("END BATCH")
  count: 0
  period: 1m

batching:
  count: 10
  jitter: 0.1
  period: 10s

`batching.count`

A number of messages at which the batch should be flushed. If 0 disables count based batching.

Type: int
Default: 0

`batching.byte_size`

An amount of bytes at which the batch should be flushed. If 0 disables size based batching.

Type: int
Default: 0

`batching.period`

A period in which an incomplete batch should be flushed regardless of its size.

Type: string
Default: ""

# Examples

period: 1s

period: 1m

period: 500ms

`batching.jitter`

A non-negative factor that adds random delay to batch flush intervals, where delay is determined uniformly at random between 0 and jitter * period. For example, with period: 100ms and jitter: 0.1, each flush will be delayed by a random duration between 0-10ms.

Type: float
Default: 0

# Examples

jitter: 0.01

jitter: 0.1

jitter: 1

`batching.check`

A Bloblang query that should return a boolean value indicating whether a message should end a batch.

Type: string
Default: ""

# Examples

check: this.type == "end_of_transaction"

`batching.processors`

A list of processors to apply to a batch as it is flushed. This allows you to aggregate and archive the batch however you see fit. Please note that all resulting messages are flushed as a single batch, therefore splitting the batch into smaller batches using these processors is a no-op.

Type: array

# Examples

processors:
  - archive:
      format: concatenate

processors:
  - archive:
      format: lines

processors:
  - archive:
      format: json_array

Metadata
Fields

Metadata​

Fields​

seed_brokers​

topics​

regexp_topics​

consumer_group​

client_id​

rack_id​

checkpoint_limit​

auto_replay_nacks​

commit_period​

start_from_oldest​

group_balancers​

metadata_max_age​

fetch_max_bytes​

fetch_max_partition_bytes​

fetch_max_wait​

preferring_lag​

tls​

tls.enabled​

tls.skip_cert_verify​

tls.enable_renegotiation​

tls.root_cas​

tls.root_cas_file​

tls.client_certs​

tls.client_certs[].cert​

tls.client_certs[].key​

tls.client_certs[].cert_file​

tls.client_certs[].key_file​

tls.client_certs[].password​

sasl​

sasl[].mechanism​

sasl[].username​

sasl[].password​

sasl[].token​

sasl[].extensions​

sasl[].aws​

sasl[].aws.region​

sasl[].aws.endpoint​

sasl[].aws.credentials​

sasl[].aws.credentials.profile​

sasl[].aws.credentials.id​

sasl[].aws.credentials.secret​

sasl[].aws.credentials.token​

sasl[].aws.credentials.from_ec2_role​

sasl[].aws.credentials.role​

sasl[].aws.credentials.role_external_id​

multi_header​

batching​

batching.count​

batching.byte_size​

batching.period​

batching.jitter​

batching.check​

batching.processors​

Metadata

Fields

`seed_brokers`

`topics`

`regexp_topics`

`consumer_group`

`client_id`

`rack_id`

`checkpoint_limit`

`auto_replay_nacks`

`commit_period`

`start_from_oldest`

`group_balancers`

`metadata_max_age`

`fetch_max_bytes`

`fetch_max_partition_bytes`

`fetch_max_wait`

`preferring_lag`

`tls`

`tls.enabled`

`tls.skip_cert_verify`

`tls.enable_renegotiation`

`tls.root_cas`

`tls.root_cas_file`

`tls.client_certs`

`tls.client_certs[].cert`

`tls.client_certs[].key`

`tls.client_certs[].cert_file`

`tls.client_certs[].key_file`

`tls.client_certs[].password`

`sasl`

`sasl[].mechanism`

`sasl[].username`

`sasl[].password`

`sasl[].token`

`sasl[].extensions`

`sasl[].aws`

`sasl[].aws.region`

`sasl[].aws.endpoint`

`sasl[].aws.credentials`

`sasl[].aws.credentials.profile`

`sasl[].aws.credentials.id`

`sasl[].aws.credentials.secret`

`sasl[].aws.credentials.token`

`sasl[].aws.credentials.from_ec2_role`

`sasl[].aws.credentials.role`

`sasl[].aws.credentials.role_external_id`

`multi_header`

`batching`

`batching.count`

`batching.byte_size`

`batching.period`

`batching.jitter`

`batching.check`

`batching.processors`