Kafka Topic

Overview

The page outlines the parameters that should be included in your listener configuration when setting up a real time sync with a Kafka stream source. This process currently supports **JSON string or AVRO serialized format.**To listen in on multiple topics, you will need to configure multiple listener configs.

To listen in on multiple topics, you will need to configure multiple listener configs.

The Listener Config Table

To set up an Stream Source, you must navigate to the Listener Config table and insert a new row for your data sync (Image 1). Most of the columns within the Listener Config table persist across all Stream Sources, however exceptions will be noted. You can find all of these parameters and their relevant descriptions in the tables below.

Image 1: The Listener Config table

General Parameters

The following column parameters can be found in the Listener Config table:

Parameter	Description	Example
Name	Mandatory. Provide a name for your Listener Config.	Kafka Real-Time Sync
Event Connector Type	Mandatory. Select your Connector type from the drop down menu.	Kafka Topic
Topic	Mandatory. This field is expecting a JSON formatted value specific to the connector type you are configuring.	See the Topic tab.
Connection Attributes	Mandatory. This field is expecting a JSON formatted value specific to the connector type you are configuring.	See the Connection Attributes tab.
Status	Mandatory. This value refers to whether your listener config/real-time sync is turned on or off. Make sure you keep this set to Disabled until you are confident you have the rest of your data sync properly configured first.	Disabled
Data Sync Config	Mandatory. This drop down will list all of the data syncs on your platform. Select the one that you want to use for your real-time sync.	Kafka Data Sync
Subscription Expires On	This value is only relevant for Salesforce Stream Sources. This field is a timestamp that's auto populated when it has successfully subscribed to a topic.
Message	Leave this value blank when setting up your configuration. This field will auto populate during the running of your sync with any relevant messages. For instance Cinchy listener is running, or Listener is disabled.
Auto Offset Reset	Earliest, Latest or None. In the case where the listener is started and either there is no last message ID, or when the last message ID is invalid (due to it being deleted or it's just a new listener), it will use this column as a fallback to determine where to start reading events from. Earliest will start reading from the beginning on the queue (when the CDC was enabled on the table). This might be a suggested configuration if your use case is recoverable or re-runnable and if you need to reprocess all events to ensure accuracy. Latest will fetch the last value after whatever was last processed. This is the typical configuration. None won't read start reading any events. You are able to switch between Auto Offset Reset types after your initial configuration through the below steps: 1. Navigate to the Listener Config table. 2. Re-configure the Auto Offset Reset value. 3. Set the Status column of the Listener Config to Disabled. 4. Navigate to the Event Listener State table. 5. Find the column that pertains to your data sync's Listener Config and delete it. 6. Navigate back to the Listener Config table. 7. Set the Status column of the Listener Config to Enabled in order for your new Auto Offset Reset configuration to take effect.	Latest

Topic

The below table can be used to help create your Topic JSON needed to set up a real-time sync.

Parameter	Description	Example
topicName	Mandatory. This is the Kafka topic name to listen messages on.
messageFormat	Optional. Put "AVRO" if your messages are serialized in AVRO, otherwise leave blank.

Example Topic JSON

{
  "topicName": "<(mandatory) kafka topic name to listen messages on>",
  "messageFormat": "<(optional) Put "AVRO" if the messages are serialized in AVRO>"
}

Connection Attributes

The below table can be used to help create your Connection Attributes JSON needed to set up a real-time sync.

Parameter	Description
bootstrapServers	List the Kafka bootstrap servers in a comma-separated list. This should be in the form of host:port
saslMechanism	This will be either PLAIN, SCRAM-SHA-256, or SCRAM-SHA-512. SCRAM-SHA-256 must be formatted as: SCRAMSHA256 SCRAM-SHA-512 must be formatted as: SCRAMSHA512
saslPassword	The password for your chosen SASL mechanism
saslUsername	The username for your chosen SASL mechanism.
url	This is required if your data follows a schema when serialized in AVRO. It's a comma-separated list of URLs for schema registry instances that are used to register or lookup schemas.
basicAuthCredentialsSource	Specifies the Kafka configuration property "schema.registry.basic.auth.credentials.source" that provides the basic authentication credentials. This can be "UserInfo" | "SaslInherit"
basicAuthUserInfo	Basic Auth credentials specified in the form of username:password
sslKeystorePassword	This is the client keystore (PKCS#12) password.
securityProtocol	Kafka supports cluster encryption and authentication, which can encrypt data-in-transit between your applications and Kafka. Use this field to specify which protocol will be used for communication between client and server. Cinchy currently supports the following options: Plaintext, SaslPlaintext, or SaslSsl. Paintext: Unauthenticated, non-encrypted. SaslPlaintext: SASL-based authentication, non-encrypted. SaslSSL: SASL-based authentication, TLS-based encryption. If no parameter is specified, this will default to Plaintext.

{
  "bootstrapServers": "< (mandatory) kafka bootstrap servers in a comma-separated list in the form of host:port>",
  "saslMechanism": "<PLAIN|SCRAM-SHA-256|SCRAM-SHA-512>",
  "saslPassword": "",
  "saslUsername": "",
  "schemaRegistrySettings": {
    "url": "<(optional) This is required if your data follows a schema when serialized in Avro. A comma-separated list of URLs for schema registry instances that are used to register or lookup schemas. >",
   "basicAuthCredentialsSource": "<(optional) Specifies the Kafka configuration property "schema.registry.basic.auth.credentials.source" that provides the basic authentication credentials, this can be "UserInfo" | "SaslInherit">",
   "basicAuthUserInfo": "<(optional) Basic Auth credentials specified in the form of username:password>",
   "sslKeystorePassword": "<(optional) The client keystore (PKCS#12) password>"
  }
  "securityProtocol": "Plaintext | SaslPlaintext | SaslSsl"
}