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redis_hash

Sets Redis hash objects using the HMSET command.

# Common config fields, showing default values
output:
label: ""
redis_hash:
url: tcp://localhost:6379
key: ""
walk_metadata: false
walk_json_object: false
fields: {}
max_in_flight: 1

The field key supports interpolation functions, allowing you to create a unique key for each message.

The field fields allows you to specify an explicit map of field names to interpolated values, also evaluated per message of a batch:

output:
redis_hash:
url: tcp://localhost:6379
key: ${!json("id")}
fields:
topic: ${!meta("kafka_topic")}
partition: ${!meta("kafka_partition")}
content: ${!json("document.text")}

If the field walk_metadata is set to true then Benthos will walk all metadata fields of messages and add them to the list of hash fields to set.

If the field walk_json_object is set to true then Benthos will walk each message as a JSON object, extracting keys and the string representation of their value and adds them to the list of hash fields to set.

The order of hash field extraction is as follows:

  1. Metadata (if enabled)
  2. JSON object (if enabled)
  3. Explicit fields

Where latter stages will overwrite matching field names of a former stage.

Performance

This output benefits from sending multiple messages in flight in parallel for improved performance. You can tune the max number of in flight messages with the field max_in_flight.

Fields

url

The URL of the target Redis server. Database is optional and is supplied as the URL path. The scheme tcp is equivalent to redis.

Type: string
Default: "tcp://localhost:6379"

# Examples
url: :6397
url: localhost:6397
url: redis://localhost:6379
url: redis://:foopassword@redisplace:6379
url: redis://localhost:6379/1
url: redis://localhost:6379/1,redis://localhost:6380/1

kind

Specifies a simple, cluster-aware, or failover-aware redis client.

Type: string
Default: "simple"

# Examples
kind: simple
kind: cluster
kind: failover

master

Name of the redis master when kind is failover

Type: string
Default: ""

# Examples
master: mymaster

tls

Custom TLS settings can be used to override system defaults.

Troubleshooting

Some cloud hosted instances of Redis (such as Azure Cache) might need some hand holding in order to establish stable connections. Unfortunately, it is often the case that TLS issues will manifest as generic error messages such as "i/o timeout". If you're using TLS and are seeing connectivity problems consider setting enable_renegotiation to true, and ensuring that the server supports at least TLS version 1.2.

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.

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.

Type: string
Default: ""

tls.client_certs[].cert_file

The path to a certificate to use.

Type: string
Default: ""

tls.client_certs[].key_file

The path of a certificate key to use.

Type: string
Default: ""

key

The key for each message, function interpolations should be used to create a unique key per message. This field supports interpolation functions.

Type: string
Default: ""

# Examples
key: ${!meta("kafka_key")}
key: ${!json("doc.id")}
key: ${!count("msgs")}

walk_metadata

Whether all metadata fields of messages should be walked and added to the list of hash fields to set.

Type: bool
Default: false

walk_json_object

Whether to walk each message as a JSON object and add each key/value pair to the list of hash fields to set.

Type: bool
Default: false

fields

A map of key/value pairs to set as hash fields. This field supports interpolation functions.

Type: object
Default: {}

max_in_flight

The maximum number of messages to have in flight at a given time. Increase this to improve throughput.

Type: int
Default: 1