Configuration Properties

Confluent Platform

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.

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 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 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.