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redis_hash output

Sets Redis hash objects using the HSET command.

# Common config fields, showing default values
output:
  label: ""
  redis_hash:
    url: "" # No default (required)
    key: "" # No default (required)
    walk_metadata: false
    walk_json_object: false
    fields: {}
    max_in_flight: 64

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 Expanso Edge 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 Expanso Edge 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 (or message batches) 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.

Type: string

kind​

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

Type: string
Default: "simple"

Options: simple, cluster, failover

master​

Name of the redis master when kind is failover

Type: string
Default: ""

client_name​

Set the client name for the Redis connection.

Type: string
Default: "redpanda-connect"

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

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. Use a secret reference rather than a literal value.

Type: string
Default: ""

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: ""

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 of object
Default: []

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. Use a secret reference rather than a literal value.

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.

Secret

This field contains sensitive information. Use a secret reference rather than a literal value.

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

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: map of string
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: 64