Kafka Connections


    Creating Kafka Connection

    Short Description

    Kafka connection allows you to connect to a Kafka cluster. The connection is required by components which consume or produce records to Kafka (KafkaReader, KafkaWriter and KafkaCommit).

    Creating Kafka Connection

    To create a Kafka connection, right click Connections in Outline and choose ConnectionsCreate Kafka connection.

    In Edit Kafka connection dialog, fill in Connection name and Bootstrap servers. These two properties are sufficient for a plain unauthenticated connection.

    To set up connection authentication and/or encryption, you need to use configuration on the following SSL/TLS and/or SASL tabs.

    Save the connection and it can be used in the graph components.


    Connection properties on the Basic tab are mandatory.

    Kafka connection dialog - Basic tab

    Figure 32.12. Kafka connection dialog - Basic tab

    Connection name

    A name for this connection.

    Note that when creating a new connection, the entered name will be used to generate an ID of the connection. Whereas the connection name is just an informational label, the connection ID is used to reference this connection from graph components. Once the connection is created, the ID cannot be changing the connection name (to avoid accidental breaking of references). To change the ID of and existing connection, use the Properties view.

    Bootstrap servers

    A list of host/port pairs to use for establishing the initial connection to the Kafka cluster, e.g., Corresponds to Kafka bootstrap.servers property.


    Properties on the SSL/TLS tab allow you to use SSL for traffic enpcyption as well as for authentication.

    Kafka connection dialog - SSL/TLS tab

    Figure 32.13. Kafka connection dialog - SSL/TLS tab

    Use SSL/TLS

    Enables the use of SSL/TLS for encryption and optionally also for client authentication.

    Trust store

    The location of the trust store file.

    Trust store password

    The password for the trust store file. If a password is not set access to the truststore is still available, but integrity checking is disabled.

    Key store

    The location of the key store file. This is optional and can be used for two-way authentication for client.

    Key store password

    The store password for the key store file. Optional.

    Private key password

    The password of the private key in the key store file. Optional.

    Disable hostname validation

    Disables server host name validation. Corresponds to setting ssl.endpoint.identification.algorithm to an empty string.


    Properties on the SASL tab allow you to use SASL authentication mechanisms. Kafka uses the Java Authentication and Authorization Service (JAAS) for SASL configuration.

    Kafka connection dialog - SASL tab

    Figure 32.14. Kafka connection dialog - SASL tab

    SASL mechanism

    SASL mechanism used for the connection. Can be used by itself or in combination with SSL/TLS.

    An empty value means no SASL authentication. There are pre-filled values for GSSAPI (Kerberos) and PLAIN authentication, but you can enter a custom value. Corresponds to Kafka sasl.mechanism property.

    JAAS config

    JAAS login context parameters for SASL connection in the format used by JAAS configuration files. The format is described in


    On the Consumer tab, you can specify consumer properties which will be shared by all KafkaReader components using this connection.

    Any property set by configuration on previous tabs can be also overridden here.

    Additional consumer properties can then be set up for individual KafkaReader components in their Consumer configuration attribute.

    Kafka connection dialog - Consumer tab

    Figure 32.15. Kafka connection dialog - Consumer tab


    On the Producer tab, you can specify producer properties which will be shared by all KafkaWriter components using this connection.

    Any property set by configuration on previous tabs can be also overridden here.

    Additional producer properties can then be set up in individual KafkaWriter components in their Producer configuration attribute.

    Kafka connection dialog - Producer tab

    Figure 32.16. Kafka connection dialog - Producer tab


    Note that some authentication settings are very environment-dependent. When setting up a connection to be used on Server, the absolute paths (e.g. paths to key stores or trust stores outside of a sandbox, paths to keytab files) are absolute paths on the Server.

    Also, the Kerberos authentication depends on some system client configuration, which has to be present on the Server as well.


    VersionCompatibility Notice

    Kafka connections are available since 5.9.0 in incubation mode.