schema_registry

Reads schemas from SchemaRegistry.

Introduced in version 4.32.2.

Common

# Common config fields, showing default values
input:
  label: ""
  schema_registry:
    url: "" # No default (required)
    auto_replay_nacks: true

Advanced

# Advanced config fields, showing default values
input:
  label: ""
  schema_registry:
    url: "" # No default (required)
    include_deleted: false
    subject_filter: ""
    fetch_in_order: true
    tls:
      enabled: false
      skip_cert_verify: false
      enable_renegotiation: false
      root_cas: ""
      root_cas_file: ""
      client_certs: []
    auto_replay_nacks: true
    oauth:
      enabled: false
      consumer_key: ""
      consumer_secret: ""
      access_token: ""
      access_token_secret: ""
    basic_auth:
      enabled: false
      username: ""
      password: ""
    jwt:
      enabled: false
      private_key_file: ""
      signing_method: ""
      claims: {}
      headers: {}

Metadata

This input adds the following metadata fields to each message:

- schema_registry_subject
- schema_registry_version

You can access these metadata fields using function interpolation.

Examples

Read schemas

Read all schemas (including deleted) from a Schema Registry instance which are associated with subjects matching the ^foo.* filter.

input:
  schema_registry:
    url: http://localhost:8081
    include_deleted: true
    subject_filter: ^foo.*

Fields

url

The base URL of the schema registry service.

Type: string

include_deleted

Include deleted entities.

Type: bool

Default: false

subject_filter

Include only subjects which match the regular expression filter. All subjects are selected when not set.

Type: string

Default: ""

fetch_in_order

Fetch all schemas on connect and sort them by ID. Should be set to true when schema references are used.

Type: bool

Default: true Requires version 4.37.0 or newer

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 3.45.0 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.

Sensitive Information

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.

Sensitive Information

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.

Because the obsolete pbeWithMD5AndDES-CBC algorithm does not authenticate the ciphertext, it is vulnerable to padding oracle attacks that can let an attacker recover the plaintext.

Sensitive Information

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}

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

oauth

Allows you to specify open authentication via OAuth version 1.

Type: object

oauth.enabled

Whether to use OAuth version 1 in requests.

Type: bool

Default: false

oauth.consumer_key

A value used to identify the client to the service provider.

Type: string

Default: ""

oauth.consumer_secret

A secret used to establish ownership of the consumer key.

Sensitive Information

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: ""

oauth.access_token

A value used to gain access to the protected resources on behalf of the user.

Type: string

Default: ""

oauth.access_token_secret

A secret provided in order to establish ownership of a given access token.

Sensitive Information

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: ""

basic_auth

Allows you to specify basic authentication.

Type: object

basic_auth.enabled

Whether to use basic authentication in requests.

Type: bool

Default: false

basic_auth.username

A username to authenticate as.

Type: string

Default: ""

basic_auth.password

A password to authenticate with.

Sensitive Information

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: ""

jwt

BETA: Allows you to specify JWT authentication.

Type: object

jwt.enabled

Whether to use JWT authentication in requests.

Type: bool

Default: false

jwt.private_key_file

A file with the PEM encoded via PKCS1 or PKCS8 as private key.

Type: string

Default: ""

jwt.signing_method

A method used to sign the token such as RS256, RS384, RS512 or EdDSA.

Type: string

Default: ""

jwt.claims

A value used to identify the claims that issued the JWT.

Type: object

Default: {}

jwt.headers

Add optional key/value headers to the JWT.

Type: object

Default: {}