cassandra

Type:

Executes a find query and creates a message for each row received.

  • Common

  • Advanced

# Common config fields, showing default values
input:
  label: ""
  cassandra:
    addresses: [] # No default (required)
    timeout: 600ms
    query: "" # No default (required)
    auto_replay_nacks: true
# All config fields, showing default values
input:
  label: ""
  cassandra:
    addresses: [] # No default (required)
    tls:
      enabled: false
      skip_cert_verify: false
      enable_renegotiation: false
      root_cas: ""
      root_cas_file: ""
      client_certs: []
    password_authenticator:
      enabled: false
      username: ""
      password: ""
    disable_initial_host_lookup: false
    max_retries: 3
    backoff:
      initial_interval: 1s
      max_interval: 5s
    timeout: 600ms
    query: "" # No default (required)
    auto_replay_nacks: true

Examples

  • Minimal Select (Cassandra/Scylla)

Let’s presume that we have 3 Cassandra nodes, like in this tutorial by Sebastian Sigl from freeCodeCamp:

https://www.freecodecamp.org/news/the-apache-cassandra-beginner-tutorial/

Then if we want to select everything from the table users_by_country, we should use the configuration below. If we specify the stdin output, the result will look like:

{"age":23,"country":"UK","first_name":"Bob","last_name":"Sandler","user_email":"bob@email.com"}

This configuration also works for Scylla.

input:
  cassandra:
    addresses:
      - 172.17.0.2
    query:
      'SELECT * FROM learn_cassandra.users_by_country'

Fields

addresses

A list of Cassandra nodes to connect to. Multiple comma separated addresses can be specified on a single line.

Type: array

# Examples

addresses:
  - localhost:9042

addresses:
  - foo:9042
  - bar:9042

addresses:
  - foo:9042,bar:9042

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.

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.

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.

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}

password_authenticator

Optional configuration of Cassandra authentication parameters.

Type: object

password_authenticator.enabled

Whether to use password authentication

Type: bool

Default: false

password_authenticator.username

The username to authenticate as.

Type: string

Default: ""

password_authenticator.password

The password to authenticate with.

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: ""

disable_initial_host_lookup

If enabled the driver will not attempt to get host info from the system.peers table. This can speed up queries but will mean that data_centre, rack and token information will not be available.

Type: bool

Default: false

max_retries

The maximum number of retries before giving up on a request.

Type: int

Default: 3

backoff

Control time intervals between retry attempts.

Type: object

backoff.initial_interval

The initial period to wait between retry attempts.

Type: string

Default: "1s"

backoff.max_interval

The maximum period to wait between retry attempts.

Type: string

Default: "5s"

timeout

The client connection timeout.

Type: string

Default: "600ms"

query

A query to execute.

Type: string

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