Configuration Reference for Google Cloud Functions Sink Connector for Confluent Platform¶

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

connector.class=io.confluent.connect.gcp.GoogleCloudFunctionsSinkConnector

Connector-specific configuration properties are described below.

Note

These are properties for the self-managed connector. If you are using Confluent Cloud, see Google Cloud Functions Sink Connector for Confluent Cloud.

Connector¶

behavior.on.error

How to handle cloud function responses that return an error, like HTTP 404. Response codes greater than or equal to 400 are considered to be an error. Anything below 400 is a success.

Type: string
Default: fail
Valid Values: [ignore, log, fail]
Importance: low

function.name

The name of the target cloud function.

Type: string
Importance: high

project.id

The project ID that the target cloud function belongs to.

Type: string
Importance: high

region

The region where the target cloud function is hosted.

Type: string
Importance: high

gcf.credentials.path

The path to JSON service credentials file. If empty, credentials are read from the gcf.credentials.json configuration.

Type: string
Default: null
Importance: high

gcf.credentials.json

The contents of the JSON service key file. If empty, credentials are read from the gcf.credentials.path configuration.

Type: password
Default: null
Importance: high

Connection¶

max.batch.size

The maximum number of records batched and sent per a single request.

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

max.pending.requests

The maximum number of pending requests that can be made to Google Cloud Functions concurrently.

Type: int
Default: 1
Valid Values: [1, …, 128]
Importance: medium

request.timeout.ms

The maximum time, in milliseconds, that the connector attempts to request Google Cloud Functions before timing out (socket timeout).

Type: int
Default: 5 minutes
Valid Values: [0, …]
Importance: low

retry.timeout.ms

The total amount of time, in milliseconds, that the connector will exponentially backoff and retry failed requests i.e on throttling. Response codes that are retried are HTTP 429 Too Busy and HTTP 502 Bad Gateway. A value of -1 indicates indefinite retrying.

Type: int
Default: 10 minutes
Valid Values: [-1, …]
Importance: low

Connect Reporter¶

For more information about Reporter, see Connect Reporter.

reporter.result.topic.name

The name of the topic to produce records to after successfully processing a sink record. Use ${connector} within the pattern to specify the current connector name. Leave blank to disable error reporting behavior.

Type: string
Default: ${connector}-success
Valid Values: Replacing ${connector} must be either Valid topic names that contain 1-249 ASCII alphanumeric, +, ., _ and - characters.
Importance: medium

reporter.result.topic.replication.factor

The replication factor of the result topic when it is automatically created by this connector. This determines how many broker failures can be tolerated before data loss occurs. This should be 1 in development environments and ALWAYS at least 3 in production environments.

Type: short
Default: 3
Valid Values: [1,…]
Importance: medium

reporter.result.topic.partitions

The number of partitions in the result topic when it is automatically created by this connector. This number of partitions should be the same as the number of input partitions to handle the potential throughput.

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

reporter.error.topic.name

The name of the topic to produce records to after each unsuccessful record sink attempt. Use ${connector} within the pattern to specify the current connector name. Leave blank to disable error reporting behavior.

Type: string
Default: ${connector}-error
Valid Values: Replacing ${connector} must be either Valid topic names that contain 1-249 ASCII alphanumeric, +, ., _ and - characters.
Importance: medium

reporter.error.topic.replication.factor

The replication factor of the error topic when it is automatically created by this connector. This determines how many broker failures can be tolerated before data loss occurs. This should be 1 in development environments and ALWAYS at least 3 in production environments.

Type: short
Default: 3
Valid Values: [1,…]
Importance: medium

reporter.error.topic.partitions

The number of partitions in the error topic when it is automatically created by this connector. This number of partitions should be the same as the number of input partitions in order to handle the potential throughput.

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

reporter.bootstrap.servers

A list of host/port pairs to use for establishing the initial connection to the Kafka cluster. The client will make use of all servers regardless of which bootstrap servers are specified here. This list only impacts the initial hosts used to discover the full set of servers. This list should be in the form host1:port1,host2:port2,.. Since these servers are just used for the initial connection to discover the full cluster membership (which may change dynamically), this list does not need to contain the full set of servers. However, you may want to include more than one in case a server is down.

Type: list
Valid Values: Non-empty list
Importance: high

Formatter¶

reporter.result.topic.key.format

The format in which the result report key is serialized.

Type: string
Default: json
Valid Values: one of [string, json]
Importance: medium
Dependents: reporter.result.topic.key.format.schemas.enable, reporter.result.topic.key.format.schemas.cache.size

reporter.result.topic.value.format

The format in which the result report value is serialized.

Type: string
Default: json
Valid Values: one of [string, json]
Importance: medium
Dependents: reporter.result.topic.value.format.schemas.cache.size, reporter.result.topic.value.format.schemas.enable

reporter.error.topic.key.format

The format in which the error report key is serialized.

Type: string
Default: json
Valid Values: one of [string, json]
Importance: medium
Dependents: reporter.error.topic.key.format.schemas.cache.size, reporter.error.topic.key.format.schemas.enable

reporter.error.topic.value.format

The format in which the error report value is serialized.

Type: string
Default: json
Valid Values: one of [string, json]
Importance: medium
Dependents: reporter.error.topic.value.format.schemas.cache.size, reporter.error.topic.value.format.schemas.enable

JSON Formatter¶

reporter.result.topic.key.format.schemas.cache.size

The maximum number of schemas that can be cached in the JSON formatter.

Type: int
Default: 128
Valid Values: [0,…,2048]
Importance: medium

reporter.result.topic.key.format.schemas.enable

Include schemas within each of the serialized values and keys.

Type: boolean
Default: false
Importance: medium

reporter.result.topic.value.format.schemas.cache.size

The maximum number of schemas that can be cached in the JSON formatter.

Type: int
Default: 128
Valid Values: [0,…,2048]
Importance: medium

reporter.result.topic.value.format.schemas.enable

Include schemas within each of the serialized values and keys.

Type: boolean
Default: false
Importance: medium

reporter.error.topic.key.format.schemas.cache.size

The maximum number of schemas that can be cached in the JSON formatter.

Type: int
Default: 128
Valid Values: [0,…,2048]
Importance: medium

reporter.error.topic.key.format.schemas.enable

Include schemas within each of the serialized values and keys.

Type: boolean
Default: false
Importance: medium

reporter.error.topic.value.format.schemas.cache.size

The maximum number of schemas that can be cached in the JSON formatter.

Type: int
Default: 128
Valid Values: [0,…,2048]
Importance: medium

reporter.error.topic.value.format.schemas.enable

Include schemas within each of the serialized values and keys.

Type: boolean
Default: false
Importance: medium

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 following form:

host1:port1,host2:port2,...

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¶

You can put license-related properties in the connector configuration, or starting with Confluent Platform version 6.0, you can put license-related properties in the Connect worker configuration instead of in each connector configuration.

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, 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. 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..

License topic ACLs¶

The _confluent-command topic contains the license that corresponds to the license key supplied through the confluent.license property. It is created by default. Connectors that access this topic require the following ACLs configured:

CREATE and DESCRIBE on the resource cluster, if the connector needs to create the topic.
DESCRIBE, READ, and WRITE on the _confluent-command topic.

Important

You can also use DESCRIBE and READ without WRITE to restrict access to read-only for license topic ACLs. If a topic exists, the LicenseManager will not try to create the topic.

You can provide access either individually for each principal that will use the license or use a wildcard entry to allow all clients. The following examples show commands that you can use to configure ACLs for the resource cluster and _confluent-command topic.

Set a CREATE and DESCRIBE ACL on the resource cluster:

kafka-acls --bootstrap-server localhost:9092 --command-config adminclient-configs.conf \
--add --allow-principal User:<principal> \
--operation CREATE --operation DESCRIBE --cluster

Set a DESCRIBE, READ, and WRITE ACL on the _confluent-command topic:

kafka-acls --bootstrap-server localhost:9092 --command-config adminclient-configs.conf \
--add --allow-principal User:<principal> \
--operation DESCRIBE --operation READ --operation WRITE --topic _confluent-command

Override Default Configuration Properties¶

You can override the replication factor using confluent.topic.replication.factor. For example, when using a 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 producer.override.* prefix (for source connectors) and consumer-specific properties by using the consumer.override.* prefix (for sink connectors).

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.