Important

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Configuration Properties¶

To use this connector, specify the name of the connector class in the connector.class configuration property.

connector.class=io.confluent.connect.replicator.ReplicatorSourceConnector

Connector-specific configuration properties are described below.

Source Topics¶

topic.regex

Regex of topics to replicate to the destination cluster.

Type: string
Default: null
Importance: high

topic.whitelist

Whitelist of topics to be replicated.

Type: list
Default: “”
Importance: high

topic.blacklist

Topics to exclude from replication.

Type: list
Default: “”
Importance: high

topic.poll.interval.ms

How often to poll the source cluster for new topics matching topic.whitelist or topic.regex.

Type: int
Default: 120000
Valid Values: [0,…]
Importance: low

offset.topic.commit

Whether to commit Replicator’s consumer offsets to the source Kafka cluster after the messages have been written to the destination cluster. These consumer offsets can be used to easily track the lag of Replicator.

Type: boolean
Default: true
Importance: medium

Source Data Conversion¶

src.key.converter

Converter for the key field of messages retrieved from the source cluster.

Type: class
Default: io.confluent.connect.replicator.util.ByteArrayConverter
Importance: low

src.value.converter

Converter for the value field of messages retrieved from the source cluster.

Type: class
Default: io.confluent.connect.replicator.util.ByteArrayConverter
Importance: low

src.header.converter

HeaderConverter class used to convert serialized Kafka headers to Kafka Connect headers. Default value is ByteArrayConverter, which simply passes the input bytes into the destination record.

Type: class
Default: io.confluent.connect.replicator.util.ByteArrayConverter
Importance: low

Source ZooKeeper¶

Important

If dest.zookeeper.connect is not set or if you are using consumer offset translation, you must set the destination Apache Kafka® cluster properties.

src.zookeeper.connect

ZooKeeper connection string for the source cluster.

Type: string
Importance: high

src.zookeeper.connection.timeout.ms

Connection timeout in milliseconds for the source ZooKeeper cluster.

Type: int
Default: 6000
Valid Values: [0,…]
Importance: low

src.zookeeper.session.timeout.ms

Session timeout in milliseconds for the source ZooKeeper cluster.

Type: int
Default: 6000
Valid Values: [0,…]
Importance: low

Source Kafka¶

The following configuration options are common properties that are used across Kafka clients. Replicator uses these options to connect with the source cluster (consumer, adminclient). Valid client properties that use the src.kafka prefix will be forwarded to clients that connect to the source cluster.

src.kafka.bootstrap.servers

A list of host and port pairs to use for establishing the initial connection to the source Kafka cluster. The client will use all servers, irrespective of which servers are designated here for bootstrapping. This list only controls the initial hosts used to discover the full set of servers. This list must be in the form host1:port1,host2:port2,.... These servers are only used for the initial connection, to discover the full cluster membership. You don’t need to specify the full set of servers, but you may want to specify more than one, in case of failover.

Type: list
Importance: high

src.kafka.client.id

An ID string to pass to the server when making requests. This string is used to track the source of requests. It allows a logical application name to be included in server-side request logging.

Type: string
Default: “”
Importance: low

src.kafka.request.timeout.ms

Specifies the maximum amount of time the client will wait for the response of a request. If the response is not received before the timeout elapses, the client will resend, or fail the request if retries are exhausted.

Type: int
Default: 305000
Valid Values: [0,…]
Importance: medium

src.kafka.retry.backoff.ms

Specifies the amount of time to wait before attempting to retry a failed request to a topic partition. This avoids repeatedly sending requests in a tight loop under some failure scenarios.

Type: long
Default: 100
Valid Values: [0,…]
Importance: low

src.kafka.connections.max.idle.ms

Specifies the amount of time (milliseconds) before idle connections are closed.

Type: long
Default: 540000
Importance: medium

src.kafka.reconnect.backoff.ms

Specifies the amount of time to wait before attempting to reconnect to a host. This avoids repeatedly connecting to a host in a tight loop. This backoff applies to all requests sent by the consumer to the broker.

Type: long
Default: 50
Valid Values: [0,…]
Importance: low

src.kafka.metric.reporters

A list of classes to use as metrics reporters. Implementing the MetricReporter interface allows plugging in classes that will be notified of new metric creation. The JmxReporter is always included to register JMX statistics.

Type: list
Default: “”
Importance: low

src.kafka.metrics.num.samples

The number of samples maintained to compute metrics.

Type: int
Default: 2
Valid Values: [1,…]
Importance: low

src.kafka.metrics.sample.window.ms

The window of time a metrics sample is computed over.

Type: long
Default: 30000
Valid Values: [0,…]
Importance: low

src.kafka.send.buffer.bytes

The size of the TCP send buffer (SO_SNDBUF) to use when sending data. If the value is -1, the operating system default will be used.

Type: int
Default: 131072
Valid Values: [-1,…]
Importance: medium

src.kafka.receive.buffer.bytes

The size of the TCP receive buffer (SO_RCVBUF) to use when reading data. If the value is -1, the operating system default will be used.

Type: int
Default: 65536
Valid Values: [-1,…]
Importance: medium

Source Kafka: Security¶

src.kafka.security.protocol

Protocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.

Type: string
Default: PLAINTEXT
Valid Values: [PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL]
Importance: medium

src.kafka.sasl.mechanism

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: GSSAPI
Importance: medium

src.kafka.sasl.kerberos.ticket.renew.window.factor

Login thread will sleep until the specified window factor of time from last refresh to ticket’s expiry has been reached, at which time it will try to renew the ticket.

Type: double
Default: 0.8
Importance: low

src.kafka.sasl.kerberos.min.time.before.relogin

Login thread sleep time between refresh attempts.

Type: long
Default: 60000
Importance: low

src.kafka.sasl.kerberos.kinit.cmd

Kerberos kinit command path.

Type: string
Default: /usr/bin/kinit
Importance: low

src.kafka.sasl.kerberos.service.name

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: string
Default: null
Importance: medium

src.kafka.sasl.kerberos.ticket.renew.jitter

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.05
Importance: low

src.kafka.ssl.protocol

The SSL protocol used to generate the SSLContext. Default setting is TLS, which is fine for most cases. Allowed values in recent JVMs are TLS, TLSv1.1 and TLSv1.2. SSL, SSLv2 and SSLv3 may be supported in older JVMs, but their usage is discouraged due to known security vulnerabilities.

Type: string
Default: TLS
Importance: medium

src.kafka.ssl.provider

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: null
Importance: medium

src.kafka.ssl.enabled.protocols

The list of protocols enabled for SSL connections.

Type: list
Default: TLSv1.2,TLSv1.1,TLSv1
Importance: medium

src.kafka.ssl.keystore.location

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

Type: string
Default: null
Importance: high

src.kafka.ssl.cipher.suites

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: list
Default: null
Importance: low

src.kafka.ssl.secure.random.implementation

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: null
Importance: low

src.kafka.ssl.truststore.type

The file format of the trust store file.

Type: string
Default: JKS
Importance: medium

src.kafka.ssl.keystore.type

The file format of the key store file. This is optional for client.

Type: string
Default: JKS
Importance: medium

src.kafka.ssl.trustmanager.algorithm

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: PKIX
Importance: low

src.kafka.ssl.truststore.location

The location of the trust store file.

Type: string
Default: null
Importance: high

src.kafka.ssl.keystore.password

The store password for the key store file. This is optional for client and only needed if ssl.keystore.location is configured.

Type: password
Default: null
Importance: high

src.kafka.ssl.keymanager.algorithm

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: SunX509
Importance: low

src.kafka.ssl.key.password

The password of the private key in the key store file. This is optional for client.

Type: password
Default: null
Importance: high

src.kafka.ssl.truststore.password

The password for the trust store file.

Type: password
Default: null
Importance: high

src.kafka.ssl.endpoint.identification.algorithm

The endpoint identification algorithm to validate server hostname using server certificate.

Type: string
Default: null
Importance: low

Source Kafka: Consumer¶

The following configuration options are properties that are specific to the Kafka consumer. These options will be combined with the src.kafka properties and forwarded to consumers that connect to the source cluster.

src.consumer.interceptor.classes

A list of classes to use as interceptors. Implementing the ConsumerInterceptor interface allows you to intercept (and possibly mutate) records received by the consumer. By default, there are no interceptors.

Type: list
Default: null
Importance: low

src.consumer.fetch.max.wait.ms

The maximum amount of time the server will block before answering the fetch request if there isn’t sufficient data to immediately satisfy the requirement given by fetch.min.bytes.

Type: int
Default: 500
Valid Values: [0,…]
Importance: low

src.consumer.fetch.min.bytes

The minimum amount of data the server should return for a fetch request. If insufficient data is available the request will wait for that much data to accumulate before answering the request. The default setting of 1 byte means that fetch requests are answered as soon as a single byte of data is available or the fetch request times out waiting for data to arrive. Setting this to something greater than 1 will cause the server to wait for larger amounts of data to accumulate which can improve server throughput a bit at the cost of some additional latency.

Type: int
Default: 1
Valid Values: [0,…]
Importance: high

src.consumer.fetch.max.bytes

The maximum amount of data the server should return for a fetch request. This is not an absolute maximum, if the first message in the first non-empty partition of the fetch is larger than this value, the message will still be returned to ensure that the consumer can make progress. The maximum message size accepted by the broker is defined via message.max.bytes (broker config) or max.message.bytes (topic config). Note that the consumer performs multiple fetches in parallel.

Type: int
Default: 52428800
Valid Values: [0,…]
Importance: medium

src.consumer.max.partition.fetch.bytes

The maximum amount of data per-partition the server will return. If the first message in the first non-empty partition of the fetch is larger than this limit, the message will still be returned to ensure that the consumer can make progress. The maximum message size accepted by the broker is defined via message.max.bytes (broker config) or max.message.bytes (topic config). See fetch.max.bytes for limiting the consumer request size

Type: int
Default: 1048576
Valid Values: [0,…]
Importance: high

src.consumer.max.poll.records

The maximum number of records returned in a single call to poll().

Type: int
Default: 500
Valid Values: [1,…]
Importance: medium

src.consumer.check.crcs

Automatically check the CRC32 of the records consumed. This ensures no on-the-wire or on-disk corruption to the messages occurred. This check adds some overhead, so it may be disabled in cases seeking extreme performance.

Type: boolean
Default: true
Importance: low

Destination Topics¶

topic.rename.format

A format string for the topic name in the destination cluster, which may contain ‘${topic}’ as a placeholder for the originating topic name. For example, dc_${topic} for the topic ‘orders’ will map to the destination topic name ‘dc_orders’.

Be careful of the potential for topic name collisions when configuring replicators from multiple source clusters. We typically recommend that each cluster be given a distinct prefix or suffix (as in the example above).

Type: string
Default: ${topic}
Importance: high

topic.auto.create

Whether to automatically create topics in the destination cluster if required.

Type: boolean
Default: true
Importance: low

topic.preserve.partitions

Whether to automatically increase the number of partitions in the destination cluster to match the source cluster and ensure that messages replicated from the source cluster use the same partition in the destination cluster.

Tip

You can replicate messages from a specific point in time if either of these conditions exist, otherwise Replicator will replicate messages from the beginning:

topic.preserve.partitions = false
The number of partitions is identical in the source and destination clusters.

If these conditions are met, Replicator can use the consumer offsets from src.consumer.group.id or name, and replicate messages based on these consumer offsets.

Type: boolean
Default: true
Importance: low

topic.create.backoff.ms

Time to wait before retrying auto topic creation or expansion.

Type: int
Default: 120000
Valid Values: [0,…]
Importance: low

topic.config.sync

Whether to periodically sync topic configuration to the destination cluster.

Type: boolean
Default: true
Importance: low

topic.config.sync.interval.ms

How often to check for configuration changes when topic.config.sync is enabled.

Type: int
Default: 120000
Valid Values: [0,…]
Importance: low

topic.timestamp.type

The timestamp type for the topics in the destination cluster.

Type: string
Default: CreateTime
Valid Values: [CreateTime, LogAppendTime]
Importance: low

Destination ZooKeeper¶

dest.zookeeper.connect

ZooKeeper connection string for the destination cluster.

Important

If dest.zookeeper.connect is set, the destination Kafka cluster properties are only required if you are using consumer offset translation.

Type: string
Importance: high

dest.zookeeper.connection.timeout.ms

Connection timeout in milliseconds for the destination ZooKeeper cluster.

Type: int
Default: 6000
Valid Values: [0,…]
Importance: low

dest.zookeeper.session.timeout.ms

Session timeout in milliseconds for the destination ZooKeeper cluster.

Type: int
Default: 6000
Valid Values: [0,…]
Importance: low

Destination Kafka¶

Important

If dest.zookeeper.connect is not set or if you are using consumer offset translation, you must set the destination Apache Kafka® cluster properties.

dest.kafka.bootstrap.servers

A list of host and port pairs to use for establishing the initial connection to the destination Kafka cluster. The client will use all servers, irrespective of which servers are designated here for bootstrapping. This list only controls the initial hosts used to discover the full set of servers. This list must be in the form host1:port1,host2:port2,.... These servers are only used for the initial connection, to discover the full cluster membership. You don’t need to specify the full set of servers, but you may want to specify more than one, in case of failover.

Type: list
Importance: high

dest.kafka.client.id

An ID string to pass to the server when making requests. This string is used to track the source of requests. It allows a logical application name to be included in server-side request logging.

Type: string
Default: “”
Importance: low

dest.kafka.request.timeout.ms

Specifies the maximum amount of time the client will wait for the response of a request. If the response is not received before the timeout elapses, the client will resend, or fail the request if retries are exhausted.

Type: int
Default: 305000
Valid Values: [0,…]
Importance: medium

dest.kafka.retry.backoff.ms

Specifies the amount of time to wait before attempting to retry a failed request to a topic partition. This avoids repeatedly sending requests in a tight loop under some failure scenarios.

Type: long
Default: 100
Valid Values: [0,…]
Importance: low

dest.kafka.connections.max.idle.ms

Specifies the amount of time (milliseconds) before idle connections are closed.

Type: long
Default: 540000
Importance: medium

dest.kafka.reconnect.backoff.ms

Specifies the amount of time to wait before attempting to reconnect to a host. This avoids repeatedly connecting to a host in a tight loop. This backoff applies to all requests sent by the consumer to the broker.

Type: long
Default: 50
Valid Values: [0,…]
Importance: low

dest.kafka.metric.reporters

A list of classes to use as metrics reporters. Implementing the MetricReporter interface allows plugging in classes that will be notified of new metric creation. The JmxReporter is always included to register JMX statistics.

Type: list
Default: “”
Importance: low

dest.kafka.metrics.num.samples

The number of samples maintained to compute metrics.

Type: int
Default: 2
Valid Values: [1,…]
Importance: low

dest.kafka.metrics.sample.window.ms

The window of time a metrics sample is computed over.

Type: long
Default: 30000
Valid Values: [0,…]
Importance: low

dest.kafka.send.buffer.bytes

The size of the TCP send buffer (SO_SNDBUF) to use when sending data. If the value is -1, the operating system default will be used.

Type: int
Default: 131072
Valid Values: [-1,…]
Importance: medium

dest.kafka.receive.buffer.bytes

The size of the TCP receive buffer (SO_RCVBUF) to use when reading data. If the value is -1, the operating system default will be used.

Type: int
Default: 65536
Valid Values: [-1,…]
Importance: medium

Destination Kafka: Security¶

dest.kafka.security.protocol

Protocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.

Type: string
Default: PLAINTEXT
Valid Values: [PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL]
Importance: medium

dest.kafka.sasl.mechanism

SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

Type: string
Default: GSSAPI
Importance: medium

dest.kafka.sasl.kerberos.ticket.renew.window.factor

Specifies the window factor of time that the login thread will sleep until the ticket is renewed. The window factor of time is computed from last refresh to ticket’s expiry.

Type: double
Default: 0.8
Importance: low

dest.kafka.sasl.kerberos.min.time.before.relogin

Login thread sleep time between refresh attempts.

Type: long
Default: 60000
Importance: low

dest.kafka.sasl.kerberos.kinit.cmd

Kerberos kinit command path.

Type: string
Default: /usr/bin/kinit
Importance: low

dest.kafka.sasl.kerberos.service.name

The Kerberos principal name that Kafka runs as. This can be defined either in Kafka’s JAAS config or in Kafka’s config.

Type: string
Default: null
Importance: medium

dest.kafka.sasl.kerberos.ticket.renew.jitter

Percentage of random jitter added to the renewal time.

Type: double
Default: 0.05
Importance: low

dest.kafka.ssl.protocol

The SSL protocol used to generate the SSLContext. Default setting is TLS, which is fine for most cases. Allowed values in recent JVMs are TLS, TLSv1.1 and TLSv1.2. SSL, SSLv2 and SSLv3 may be supported in older JVMs, but their usage is discouraged due to known security vulnerabilities.

Type: string
Default: TLS
Importance: medium

dest.kafka.ssl.provider

The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

Type: string
Default: null
Importance: medium

dest.kafka.ssl.enabled.protocols

The list of protocols enabled for SSL connections.

Type: list
Default: TLSv1.2,TLSv1.1,TLSv1
Importance: medium

dest.kafka.ssl.keystore.location

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

Type: string
Default: null
Importance: high

dest.kafka.ssl.cipher.suites

A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol. By default all the available cipher suites are supported.

Type: list
Default: null
Importance: low

dest.kafka.ssl.secure.random.implementation

The SecureRandom PRNG implementation to use for SSL cryptography operations.

Type: string
Default: null
Importance: low

dest.kafka.ssl.truststore.type

The file format of the trust store file.

Type: string
Default: JKS
Importance: medium

dest.kafka.ssl.keystore.type

The file format of the key store file. This is optional for client.

Type: string
Default: JKS
Importance: medium

dest.kafka.ssl.trustmanager.algorithm

The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: PKIX
Importance: low

dest.kafka.ssl.truststore.location

The location of the trust store file.

Type: string
Default: null
Importance: high

dest.kafka.ssl.keystore.password

The store password for the key store file. This is optional for client and only needed if ssl.keystore.location is configured.

Type: password
Default: null
Importance: high

dest.kafka.ssl.keymanager.algorithm

The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

Type: string
Default: SunX509
Importance: low

dest.kafka.ssl.key.password

The password of the private key in the key store file. This is optional for client.

Type: password
Default: null
Importance: high

dest.kafka.ssl.truststore.password

The password for the trust store file.

Type: password
Default: null
Importance: high

dest.kafka.ssl.endpoint.identification.algorithm

The endpoint identification algorithm to validate server hostname using server certificate.

Type: string
Default: null
Importance: low

Destination Data Conversion¶

key.converter

Converter for the key field of messages written to the destination cluster. Use io.confluent.connect.replicator.util.ByteArrayConverter if you don’t need data conversion.

Type: class
Default: inherited from worker configuration
Importance: low

value.converter

Converter for the value field of messages written to the destination cluster. Use io.confluent.connect.replicator.util.ByteArrayConverter if you don’t need data conversion.

Type: class
Default: inherited from worker configuration
Importance: low

header.converter

HeaderConverter class used to convert serialized Kafka headers to Kafka Connect headers. Default value is ByteArrayConverter, which simply passes the input bytes into the destination record.

Type: class
Default: io.confluent.connect.replicator.util.ByteArrayConverter
Importance: low

Consumer Offset Translation¶

offset.translator.tasks.max

The maximum number of Replicator tasks that will perform offset translation. If -1 (the default), all tasks will perform offset translation.

Type: int
Default: -1
Importance: medium

offset.translator.tasks.separate

Whether to translate offsets in separate tasks from those performing topic replication.

Type: boolean
Default: false
Importance: medium

offset.timestamps.commit

Whether to commit internal offset timestamps for Replicator, so that it can resume properly when switching to the secondary cluster.

Type: boolean
Default: true
Importance: medium

timestamps.topic.replication.factor

Replication factor for the consumer timestamps topic.

Type: int
Default: 3
Importance: high

timestamps.topic.num.partitions

Number of partitions for the consumer timestamps topic.

Type: int
Default: 50
Importance: high

provenance.header.enable

Whether to enable the use of provenance headers during replication.

Type: boolean
Default: false
Importance: medium

fetch.offset.expiry.ms

The amount of time in milliseconds after which a fetch offset request for offset translation expires and is discarded.

Type: long
Default: 600000
Importance: low

fetch.offset.retry.backoff.ms

The amount of time in milliseconds to wait before attempting to retry a failed fetch offset request during offset translation.

Type: long
Default: 100
Importance: low

Confluent Platform license¶

confluent.topic.bootstrap.servers

A list of host/port pairs to use for establishing the initial connection to the Kafka cluster used for licensing. All servers in the cluster will be discovered from the initial connection. This list should be in the form <code>host1:port1,host2:port2,…</code>. Since these servers are just used for the initial connection to discover the full cluster membership (which may change dynamically), this list need not contain the full set of servers (you may want more than one, though, in case a server is down).

Type: list
Importance: high

confluent.topic

Name of the Kafka topic used for Confluent Platform configuration, including licensing information.

Type: string
Default: _confluent-command
Importance: low

confluent.topic.replication.factor

The replication factor for the Kafka topic used for Confluent Platform configuration, including licensing information. This is used only if the topic does not already exist, and the default of 3 is appropriate for production use. If you are using a development environment with less than 3 brokers, you must set this to the number of brokers (often 1).

Type: int
Default: 3
Importance: low

Confluent license properties¶

Note

This connector is proprietary and requires a license. The license information is stored in the _confluent-command topic. If the broker requires SSL for connections, you must include the security-related confluent.topic.* properties as described below.

confluent.license

Confluent issues enterprise license keys to each subscriber. The license key is text that you can copy and paste as the value for confluent.license. A trial license allows using the connector for a 30-day trial period. A developer license allows using the connector indefinitely for single-broker development environments.

If you are a subscriber, please contact Confluent Support for more information.

Type: string
Default: “”
Valid Values: Confluent Platform license
Importance: high

confluent.topic.ssl.truststore.location

The location of the trust store file.

Type: string
Default: null
Importance: high

confluent.topic.ssl.truststore.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.

Type: password
Default: null
Importance: high

confluent.topic.ssl.keystore.location

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

Type: string
Default: null
Importance: high

confluent.topic.ssl.keystore.password

The store password for the key store file. This is optional for client and only needed if ssl.keystore.location is configured.

Type: password
Default: null
Importance: high

confluent.topic.ssl.key.password

The password of the private key in the key store file. This is optional for client.

Type: password
Default: null
Importance: high

confluent.topic.security.protocol

Protocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.

Type: string
Default: “PLAINTEXT”
Importance: medium

License topic configuration¶

A Confluent enterprise license is stored in the _confluent-command topic. This topic is created by default and contains the license that corresponds to the license key supplied through the confluent.license property.

Note

No public keys are stored in Kafka topics.

The following describes how the default _confluent-command topic is generated under different scenarios:

A 30-day trial license is automatically generated for the _confluent command topic if you do not add the confluent.license property or leave this property empty (for example, confluent.license=).
Adding a valid license key (for example, confluent.license=<valid-license-key>) adds a valid license in the _confluent-command topic.

Here is an example of the minimal properties for development and testing.

You can change the name of the _confluent-command topic using the confluent.topic property (for instance, if your environment has strict naming conventions). The example below shows this change and the configured Kafka bootstrap server.

confluent.topic=foo_confluent-command
confluent.topic.bootstrap.servers=localhost:9092

The example above shows the minimally required bootstrap server property that you can use for development and testing. For a production environment, you add the normal producer, consumer, and topic configuration properties to the connector properties, prefixed with confluent.topic..

Overriding Default Configuration Properties¶

You can override the replication factor using confluent.topic.replication.factor. For example, when using an Kafka cluster as a destination with less than three brokers (for development and testing) you should set the confluent.topic.replication.factor property to 1.

You can override producer-specific properties by using the confluent.topic.producer. prefix and consumer-specific properties by using the confluent.topic.consumer. prefix.

You can use the defaults or customize the other properties as well. For example, the confluent.topic.client.id property defaults to the name of the connector with -licensing suffix. You can specify the configuration settings for brokers that require SSL or SASL for client connections using this prefix.

You cannot override the cleanup policy of a topic because the topic always has a single partition and is compacted. Also, do not specify serializers and deserializers using this prefix; they are ignored if added.