Configuration Reference for Amazon S3 Source 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.s3.source.S3SourceConnector

Connector-specific configuration properties are described below.

S3 Parameters

store.url

Store’s connection URL, if applicable. For example: http://bucket.s3-aws-region.amazonaws.com.

  • Type: string
  • Default: null
  • Importance: high
s3.bucket.name

The S3 Bucket.

  • Type: string
  • Importance: high
s3.region

The AWS region to be used the connector.

  • Type: string
  • Default: us-west-2
  • Valid Values: one of [ap-south-1, eu-west-2, eu-west-1, ap-northeast-2, ap-northeast-1, ca-central-1, sa-east-1, cn-north-1, us-gov-west-1, ap-southeast-1, ap-southeast-2, eu-central-1, us-east-1, us-east-2, us-west-1, us-west-2]
  • Importance: medium
s3.credentials.provider.class

Credentials provider or provider chain to use for authentication to AWS. By default the connector uses ‘DefaultAWSCredentialsProviderChain’.

  • Type: class
  • Default: com.amazonaws.auth.DefaultAWSCredentialsProviderChain
  • Valid Values: Any class implementing: com.amazonaws.auth.AWSCredentialsProvider
  • Importance: low
aws.access.key.id

The AWS Access Key ID used to connect to S3. If specified, this will be used over the credentials provider chain.

  • Type: string
  • Importance: medium
aws.secret.access.key

The AWS Secret Access Key used to connect to S3. If specified, this will be used over the credentials provider chain.

  • Type: password
  • Importance: medium
s3.wan.mode

Use S3 accelerated endpoint.

  • Type: boolean
  • Default: false
  • Importance: medium
s3.path.style.access

Whether to use S3 path-style access.

  • Type: boolean
  • Default: true
  • Importance: medium
s3.retry.backoff.ms

How long to wait in milliseconds before attempting the first retry of a failed S3 request. Upon a failure, this connector may wait up to twice as long as the previous wait, up to the maximum number of retries. This avoids retrying in a tight loop under failure scenarios.

  • Type: long
  • Default: 200
  • Valid Values: [0,…]
  • Importance: low
s3.proxy.url

S3 Proxy settings encoded in URL syntax. This property is meant to be used only if you need to access S3 through a proxy.

  • Type: string
  • Default: “”
  • Importance: low
s3.proxy.user

S3 Proxy User. This property is meant to be used only if you need to access S3 through a proxy. Using s3.proxy.user instead of embedding the username and password in s3.proxy.url allows the password to be hidden in the logs.

  • Type: string
  • Default: null
  • Importance: low
s3.proxy.password

S3 Proxy Password. This property is meant to be used only if you need to access S3 through a proxy. Using s3.proxy.password instead of embedding the username and password in s3.proxy.url allows the password to be hidden in the logs.

  • Type: password
  • Default: [hidden]
  • Importance: low
s3.http.send.expect.continue

Enable/disable use of the HTTP/1.1 handshake using EXPECT: 100-CONTINUE during multi-part upload. If true, the client waits for a 100 (CONTINUE) response before sending the request body. If false, the client uploads the entire request body without checking if the server is willing to accept the request.

  • Type: boolean
  • Default: true
  • Importance: low
s3.part.retries

Maximum number of retry attempts for failed requests. Zero means no retries. The actual number of attempts is determined by the S3 client based on multiple factors, including, but not limited to the value of this parameter, type of exception occurred, throttling settings of the underlying S3 client, etc.

  • Type: int
  • Default: 3
  • Valid Values: [0,…]
  • Importance: medium
s3.ssea.name

The S3 Server-Side Encryption algorithm.

  • Type: string
  • Default: “”
  • Valid Values: either one of [kms, aes256], or an empty string.
  • Importance: low
s3.sse.customer.key

The S3 Server-Side Encryption customer-provided key (SSE-C).

  • Type: password
  • Default: [hidden]
  • Importance: low
format.bytearray.separator

String inserted between records for Byte Array Format. Defaults to System.lineSeparator() and may contain escape sequences like \n. An input record that contains the line separator looks like multiple records in the S3 object output.

  • Type: string
  • Default: null
  • Importance: low
schema.cache.size

The size of the schema cache used in the Avro converter.

  • Type: int
  • Default: 50
  • Valid Values: [1,…]
  • Importance: low
record.batch.max.size

The maximum amount of records to return each time S3 is polled.

  • Type: int
  • Default: 200
  • Valid Values: [1,…]
  • Importance: medium

S3 Parameters (Generalized Connector Only)

mode

The connector’s operation mode.

  • Type: string
  • Default: RESTORE_BACKUP
  • Valid Values: [GENERIC, RESTORE_BACKUP]
  • Importance: high
  • Dependents: task.batch.size, starting.timestamp, bucket.listing.max.objects.threshold, topic.regex.list, partitioner.class, partition.field.name, path.format
topic.regex.list

A comma-separated list of pairs of type <kafka topic>:<regex> that is used to map file paths to Kafka topics. An example might be topic1:.*\.json to source all files ending in .json to a kafka topic named topic1. You can specify multiple of these <kafka topic>:<regex> mappings to send different sets of files to different topics. Any files that aren’t mapped by a regex will be ignored and not sourced. Files that match multiple mappings will be sent to the first topic in the list that maps the file.

  • Type: list
  • Default: “”
  • Valid Values: A list of pairs in the form <kafka topic1>:<regex1>, <kafka topic2>:<regex2>, ...
  • Importance: high
task.batch.size

The number of files assigned to each task at a time.

  • Type: int
  • Default: 10
  • Valid Values: [1,…,2000]
  • Importance: medium
file.discovery.starting.timestamp

A Unix timestamp (in epoch milliseconds) that denotes where to start processing files. Any file encountered with a creation time earlier than this will be ignored.

Important

The file.discovery.starting.timestamp configuration property should only be used when there are no stored offsets for a connector–that is, this parameter is intended for new connectors to start from a specific timestamp rather than reading all the files in a bucket.

  • Type: long
  • Default: 0
  • Valid Values: [0,…]
  • Importance: medium
bucket.listing.max.objects.threshold

An integer that represents the maximum number of objects the connector will index from the bucket at a time before failing. A value of -1 indicates no limit.

  • Type: int
  • Default: -1
  • Importance: medium
parse.error.topic.prefix

The topic name prefix for a topic where records with error information would be published whenever the connector encounters a malformed file or an exception while parsing the source file. This setting appends the topic prefix with -${connectorName}. The final error topic name would be ${parse.error.topic.prefix}-${connectorName}. Note that this topic is only populated when behavior.on.error` is set to either ignore or log.

  • Type: string
  • Default: error
  • Importance: medium

Connector Parameters

s3.poll.interval.ms

Frequency in milliseconds to poll for new or removed folders. This may result in updated task configurations starting to poll for data in added folders or stopping polling for data in removed folders.

  • Type: long
  • Default: 60000
  • Importance: medium
format.class

Class responsible for converting S3 objects to source records.

  • Type: class
  • Valid Values:
    • io.confluent.connect.s3.format.avro.AvroFormat
    • io.confluent.connect.s3.format.bytearray.ByteArrayFormat
    • io.confluent.connect.s3.format.json.JsonFormat
    • io.confluent.connect.s3.format.string.StringFormat
  • Importance: high

Storage Parameters

topics.dir

Top level directory where data was stored to be re-ingested by Kafka.

Note

With the Generalized S3 Source connector, when the topics.dir parameter is set to a blank space value (' ') , the connector reads all the data specified under the S3 bucket. If you don’t set a value for topics.dir, the configuration property takes the default value of topics and expects all the data in the specified S3 bucket to be under a folder called topics.

  • Type: string
  • Default: topics
  • Importance: high
directory.delim

Directory delimiter pattern.

  • Type: string
  • Default: /
  • Importance: medium
behavior.on.error

Sets how the connector handles errors that occur when processing records and parsing source files.

fail immediately stops the connector and throws the encountered exception. ignore will log an event populated with filename and exception-message in event header, into the error-topic. This file is ignored and connector progresses to next file. log follows same steps as ignore, additionally logs the encountered exception.

Note - error-topic is only populated when ignore OR log are used. Error topic is named - ${parse.error.topic.prefix}-${connectorName}

  • Type: string
  • Default: fail
  • Valid Values: fail, ignore, log
  • Importance: medium

Partitioner Parameters (Backup and Restore Connector Only)

partitioner.class

The partitioner to use when reading data from the store.

  • Type: class
  • Default: io.confluent.connect.storage.partitioner.DefaultPartitioner
  • Importance: high
partition.field.name

The name of the partitioning field when FieldPartitioner is used.

  • Type: list
  • Default: “”
  • Importance: medium
path.format

This configuration that was used to set the format of the data directories when partitioning with a TimeBasedPartitioner. For example, if you set path.format to 'year'=YYYY/'month'=MM/'day'=dd/'hour'=HH, then a valid data directories would be: /year=2015/month=12/day=07/hour=15/.

  • Type: string
  • Default: “”
  • Importance: medium
format.bytearray.extension

Output file extension for Byte Array Format. Defaults to .bin.

  • Type: string
  • Default: .bin
  • Importance: low

Auto topic creation

For more information about Auto topic creation, see Configuring Auto Topic Creation for Source Connectors.

Configuration properties accept regular expressions (regex) that are defined as Java regex.

topic.creation.groups

A list of group aliases that are used to define per-group topic configurations for matching topics. A default group always exists and matches all topics.

  • Type: List of String types
  • Default: empty
  • Possible Values: The values of this property refer to any additional groups. A default group is always defined for topic configurations.
topic.creation.$alias.replication.factor

The replication factor for new topics created by the connector. This value must not be larger than the number of brokers in the Kafka cluster. If this value is larger than the number of Kafka brokers, an error occurs when the connector attempts to create a topic. This is a required property for the default group. This property is optional for any other group defined in topic.creation.groups. Other groups use the Kafka broker default value.

  • Type: int
  • Default: n/a
  • Possible Values: >= 1 for a specific valid value or -1 to use the Kafka broker’s default value.
topic.creation.$alias.partitions

The number of topic partitions created by this connector. This is a required property for the default group. This property is optional for any other group defined in topic.creation.groups. Other groups use the Kafka broker default value.

  • Type: int
  • Default: n/a
  • Possible Values: >= 1 for a specific valid value or -1 to use the Kafka broker’s default value.
topic.creation.$alias.include

A list of strings that represent regular expressions that match topic names. This list is used to include topics with matching values, and apply this group’s specific configuration to the matching topics. $alias applies to any group defined in topic.creation.groups. This property does not apply to the default group.

  • Type: List of String types
  • Default: empty
  • Possible Values: Comma-separated list of exact topic names or regular expressions.
topic.creation.$alias.exclude

A list of strings representing regular expressions that match topic names. This list is used to exclude topics with matching values from getting the group’s specfic configuration. $alias applies to any group defined in topic.creation.groups. This property does not apply to the default group. Note that exclusion rules override any inclusion rules for topics.

  • Type: List of String types
  • Default: empty
  • Possible Values: Comma-separated list of exact topic names or regular expressions.
topic.creation.$alias.${kafkaTopicSpecificConfigName}

Any of the Changing Broker Configurations Dynamically for the version of the Kafka broker where the records will be written. The broker’s topic-level configuration value is used if the configuration is not specified for the rule. $alias applies to the default group as well as any group defined in topic.creation.groups.

  • Type: property values
  • Default: Kafka broker value

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

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.

  1. 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

  2. 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.