Docs Cloud Develop Redpanda Connect Components Outputs kafka_migrator kafka_migrator Type: OutputInput Writes a batch of messages to a Kafka broker and waits for acknowledgement before propagating them back to the input. Use this connector in conjunction with the kafka_migrator input to migrate topics between Kafka brokers. The kafka_migrator output uses the the Franz Kafka client library. Common Advanced # Common config fields, showing default values output: label: "" kafka_migrator: seed_brokers: [] # No default (required) topic: "" # No default (required) key: "" # No default (optional) partition: ${! meta("partition") } # No default (optional) metadata: include_prefixes: [] include_patterns: [] max_in_flight: 10 batching: count: 0 byte_size: 0 period: "" check: "" # All config fields, showing default values output: label: "" kafka_migrator: seed_brokers: [] # No default (required) topic: "" # No default (required) key: "" # No default (optional) partitioner: "" # No default (optional) partition: ${! meta("partition") } # No default (optional) client_id: benthos rack_id: "" idempotent_write: true metadata: include_prefixes: [] include_patterns: [] max_in_flight: 10 timeout: 10s batching: count: 0 byte_size: 0 period: "" check: "" processors: [] # No default (optional) max_message_bytes: 1MB broker_write_max_bytes: 100MB compression: "" # No default (optional) tls: enabled: false skip_cert_verify: false enable_renegotiation: false root_cas: "" root_cas_file: "" client_certs: [] sasl: [] # No default (optional) timestamp: ${! timestamp_unix() } # No default (optional) input_resource: kafka_migrator_input This output can query the kafka_migrator input for topic and ACL configurations. If the configured broker does not contain the current message topic, this output attempts to create it along with the topic ACLs, which are automatically read from the kafka_migrator input, identified by the label specified in input_resource. Examples Transfer data Writes messages to the configured broker and creates topics and topic ACLs if they don’t exist. It also ensures that the message order is preserved. output: kafka_migrator: seed_brokers: [ "127.0.0.1:9093" ] topic: ${! metadata("kafka_topic").or(throw("missing kafka_topic metadata")) } key: ${! metadata("kafka_key") } partitioner: manual partition: ${! metadata("kafka_partition").or(throw("missing kafka_partition metadata")) } timestamp: ${! metadata("kafka_timestamp_unix").or(timestamp_unix()) } input_resource: kafka_migrator_input max_in_flight: 1 Fields seed_brokers A list of broker addresses to connect to. Use commas to separate multiple addresses in a single list item. Type: array # Examples seed_brokers: - localhost:9092 seed_brokers: - foo:9092 - bar:9092 seed_brokers: - foo:9092,bar:9092 topic A topic to write messages to. This field supports interpolation functions. Type: string key An optional key to populate for each message. This field supports interpolation functions. Type: string partitioner Override the default murmur2 hashing partitioner. Type: string Option Summary least_backup Chooses the least backed up partition (the partition with the fewest amount of buffered records). Partitions are selected per batch. manual Manually select a partition for each message. You must also specify a value for the partition field. murmur2_hash Kafka’s default hash algorithm that uses a 32-bit murmur2 hash of the key to compute the partition for the record. round_robin Round-robin’s messages through all available partitions. This algorithm has lower throughput and causes higher CPU load on brokers, but is useful if you want to ensure an even distribution of records to partitions. partition An optional explicit partition to set for each message. This field is only relevant when the partitioner is set to manual. The provided interpolation string must be a valid integer. This field supports interpolation functions. Type: string # Examples partition: ${! meta("partition") } client_id An identifier for the client connection. Type: string Default: "benthos" rack_id A rack identifier for this client. Type: string Default: "" idempotent_write Enable the idempotent write producer option. This requires the IDEMPOTENT_WRITE permission on CLUSTER. Disable this option if the IDEMPOTENT_WRITE permission is not available. Type: bool Default: true metadata Determine which (if any) metadata values are added to messages as headers. Type: object metadata.include_prefixes Provide a list of explicit metadata key prefixes to match against. Type: array Default: [] # Examples include_prefixes: - foo_ - bar_ include_prefixes: - kafka_ include_prefixes: - content- metadata.include_patterns Provide a list of explicit metadata key regular expression (re2) patterns to match against. Type: array Default: [] # Examples include_patterns: - .* include_patterns: - _timestamp_unix$ max_in_flight The maximum number of batches to send in parallel at any given time. Type: int Default: 10 timeout The maximum period of time to wait for message sends before abandoning the request and retrying Type: string Default: "10s" batching Configure a batching policy. Type: object # Examples batching: byte_size: 5000 count: 0 period: 1s batching: count: 10 period: 1s batching: check: this.contains("END BATCH") count: 0 period: 1m batching.count The number of messages after which the batch is flushed. Set to 0 to disable count-based batching. Type: int Default: 0 batching.byte_size The amount of bytes at which the batch is flushed. Set to 0 to disable size-based batching. Type: int Default: 0 batching.period The period after which an incomplete batch is flushed regardless of its size. Type: string Default: "" # Examples period: 1s period: 1m period: 500ms batching.check A Bloblang query that should return a boolean value indicating whether a message should end a batch. Type: string Default: "" # Examples check: this.type == "end_of_transaction" batching.processors A list of processors to apply to a batch as it is flushed. This allows you to aggregate and archive the batch. All resulting messages are flushed as a single batch. Splitting the batch into smaller batches using these processors is a no-op. Type: array # Examples processors: - archive: format: concatenate processors: - archive: format: lines processors: - archive: format: json_array max_message_bytes The maximum space in bytes that an individual message may use. Messages larger than this value are rejected. This field corresponds to Kafka’s max.message.bytes. Type: string Default: "1MB" # Examples max_message_bytes: 100MB max_message_bytes: 50mib broker_write_max_bytes The upper bound for the number of bytes written to a broker connection in a single write. This field corresponds to Kafka’s socket.request.max.bytes. Type: string Default: "100MB" # Examples broker_write_max_bytes: 128MB broker_write_max_bytes: 50mib compression Set an explicit compression type (optional). The default preference is to use snappy when the broker supports it. Otherwise, use none. Type: string Options: lz4 , snappy , gzip , none , zstd . tls Override system defaults with custom TLS settings. 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 Specify a certificate authority to use (optional). This is a string that represents a certificate chain from the parent trusted root certificate, through possible intermediate signing certificates, to the host certificate. This field contains sensitive information. Review your cluster security before adding it to your configuration. Type: string Default: "" # Examples root_cas: |- -----BEGIN CERTIFICATE----- ... -----END CERTIFICATE----- tls.root_cas_file Specify the path to a root certificate authority file (optional). This is a file, often with a .pem extension, which contains a certificate chain from the parent trusted root certificate, through 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 specify values for either the cert and key fields, or cert_file and key_file fields. 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. Review your cluster security before adding it to your configuration. 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. Review your cluster security before adding it to your configuration. Type: string Default: "" # Examples password: foo password: ${KEY_PASSWORD} sasl Specify one or more methods of SASL authentication. SASL mechanisms are tried in order. If the broker supports the first mechanism, all connections will use that mechanism. If the first mechanism fails, the client picks the first supported mechanism. Connections fail if the broker does not support any client mechanisms. Type: array # Examples sasl: - mechanism: SCRAM-SHA-512 password: bar username: foo sasl[].mechanism The SASL mechanism to use. Type: string Option Summary AWS_MSK_IAM AWS IAM based authentication as specified by the aws-msk-iam-auth java library. OAUTHBEARER OAuth Bearer based authentication. PLAIN Plain text authentication. SCRAM-SHA-256 SCRAM-based authentication as specified in RFC5802. SCRAM-SHA-512 SCRAM-based authentication as specified in RFC5802. none Disable sasl authentication sasl[].username A username to provide for PLAIN or SCRAM-* authentication. Type: string Default: "" sasl[].password A password to provide for PLAIN or SCRAM-* authentication. This field contains sensitive information. Review your cluster security before adding it to your configuration. Type: string Default: "" sasl[].token The token to use for a single session’s OAUTHBEARER authentication. Type: string Default: "" sasl[].extensions Key/value pairs to add to OAUTHBEARER authentication requests. Type: object sasl[].aws Contains AWS specific fields for when the mechanism is set to AWS_MSK_IAM. Type: object sasl[].aws.region The AWS region to target. Type: string Default: "" sasl[].aws.endpoint Specify a custom endpoint for the AWS API. Type: string Default: "" sasl[].aws.credentials Manually configure the AWS credentials to use (optional). For more information, see Amazon Web Services. Type: object sasl[].aws.credentials.profile A profile from ~/.aws/credentials to use. Type: string Default: "" sasl[].aws.credentials.id The ID of credentials to use. Type: string Default: "" sasl[].aws.credentials.secret The secret for the credentials being used. This field contains sensitive information. Review your cluster security before adding it to your configuration. Type: string Default: "" sasl[].aws.credentials.token The token for the credentials being used. The token is required when using short term credentials. Type: string Default: "" sasl[].aws.credentials.from_ec2_role Use the credentials of a host EC2 machine configured to assume an IAM role associated with the instance. Type: bool Default: false sasl[].aws.credentials.role A role ARN to assume. Type: string Default: "" sasl[].aws.credentials.role_external_id An external ID to provide when assuming a role. Type: string Default: "" timestamp An optional timestamp to set for each message. When left empty, the current timestamp is used. This field supports interpolation functions. Type: string # Examples timestamp: ${! timestamp_unix() } timestamp: ${! metadata("kafka_timestamp_unix") } input_resource The label of the kafka_migrator input from which to read the configurations of topics and ACLs for creation. Type: string Default: "kafka_migrator_input" Back to top × Simple online edits For simple changes, such as fixing a typo, you can edit the content directly on GitHub. Edit on GitHub Or, open an issue to let us know about something that you want us to change. Open an issue Contribution guide For extensive content updates, or if you prefer to work locally, read our contribution guide . 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