Kafka Consumer

The Kafka Consumer origin reads data from a single topic in an Apache Kafka cluster. To use multiple threads to read from multiple topics, use the Kafka Multitopic Consumer.

When you configure a Kafka Consumer, you configure the consumer group name, topic, and ZooKeeper connection information.

You can configure the Kafka Consumer to work with the Confluent Schema Registry. The Confluent Schema Registry is a distributed storage layer for Avro schemas which uses Kafka as its underlying storage mechanism.

You can add additional Kafka configuration properties as needed. You can also configure the origin to use Kafka security features.

Kafka Consumer includes record header attributes that enable you to use information about the record in pipeline processing.

Offset Management

The first time that a Kafka Consumer origin identified by a consumer group receives messages from a topic, an offset entry is created for that consumer group and topic. The offset entry is created in ZooKeeper or Kafka, depending on your Kafka version and broker configuration.

The Kafka Consumer origin begins receiving messages in the topic based on whether or not a stored offset entry exists:
No stored offset
When the consumer group and topic combination does not have a previously stored offset, the Kafka Consumer origin uses the Auto Offset Reset property to determine the first message to read. You can set the origin to read messages in the topic starting from the earliest message, latest message, or a particular timestamp. The default setting is the earliest message, which results in the origin reading all existing messages in the topic.
Previously stored offset
When the consumer group and topic combination has a previously stored offset, the Kafka Consumer origin receives messages starting with the next unprocessed message after the stored offset. For example, when you stop and restart the pipeline, processing resumes from the last committed offset.

Additional Kafka Properties

You can add custom Kafka configuration properties to the Kafka Consumer.

When you add the Kafka configuration property, enter the exact property name and the value. The Kafka Consumer does not validate the property names or values.

Note: The Kafka Consumer origin uses the following Kafka configuration properties. The origin ignores user-defined values for these properties:
  • auto.commit.enable
  • group.id
  • zookeeper.connect

Record Header Attributes

The Kafka Consumer origin creates record header attributes that include information about the originating file for the record. When the origin processes Avro data, it includes the Avro schema in an avroSchema record header attribute.

You can use the record:attribute or record:attributeOrDefault functions to access the information in the attributes. For more information about working with record header attributes, see Working with Header Attributes.

The Kafka Consumer origin creates the following record header attributes:
  • avroSchema - When processing Avro data, provides the Avro schema.
  • Kafka timestamp - The timestamp from the header of the Kafka message. Created if the Include Timestamps property is enabled.
  • Kafka timestamp type - The timestamp type from the header of the Kafka message. Created if the Include Timestamps property is enabled.
  • offset - The offset where the record originated.
  • partition - The partition where the record originated.
  • topic - The topic where the record originated.

Enabling Security

You can configure the Kafka Consumer origin to connect securely through SSL/TLS, Kerberos, or both.

Enabling SSL/TLS

Perform the following steps to enable the Kafka Consumer origin to use SSL/TLS to connect to Kafka. You can use the same steps to configure a Kafka Producer.

  1. To use SSL/TLS to connect, first make sure Kafka is configured for SSL/TLS as described in the Kafka documentation.
  2. On the General tab of the stage, set the Stage Library property to the appropriate Apache Kafka version.
  3. On the Kafka tab, add the security.protocol Kafka configuration property and set it to SSL.
  4. Then add and configure the following SSL Kafka properties:
    • ssl.truststore.location
    • ssl.truststore.password
    When the Kafka broker requires client authentication - when the ssl.client.auth broker property is set to "required" - add and configure the following properties:
    • ssl.keystore.location
    • ssl.keystore.password
    • ssl.key.password
    Some brokers might require adding the following properties as well:
    • ssl.enabled.protocols
    • ssl.truststore.type
    • ssl.keystore.type

    For details about these properties, see the Kafka documentation.

For example, the following properties allow the stage to use SSL/TLS to connect to Kafka with client authentication:

Enabling Kerberos (SASL)

When you use Kerberos authentication, Data Collector uses the Kerberos principal and keytab to connect to Kafka.

Perform the following steps to enable the Kafka Consumer origin to use Kerberos to connect to Kafka:

  1. To use Kerberos, first make sure Kafka is configured for Kerberos as described in the Kafka documentation.
  2. Make sure that Kerberos authentication is enabled for Data Collector, as described in Kerberos Authentication.
  3. Add the Java Authentication and Authorization Service (JAAS) configuration properties required for Kafka clients based on your installation and authentication type:
    • RPM, tarball, or Cloudera Manager installation without LDAP authentication - If Data Collector does not use LDAP authentication, create a separate JAAS configuration file on the Data Collector machine. Add the following KafkaClient login section to the file:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="<keytab path>"
          principal="<principal name>/<host name>@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="/etc/security/keytabs/sdc.keytab"
          principal="sdc/sdc-01.streamsets.net@EXAMPLE.COM";
      };
      Then modify the SDC_JAVA_OPTS environment variable to include the following option that defines the path to the JAAS configuration file:
      -Djava.security.auth.login.config=<JAAS config path>

      Modify environment variables using the method required by your installation type.

    • RPM or tarball installation with LDAP authentication - If LDAP authentication is enabled in an RPM or tarball installation, add the properties to the JAAS configuration file used by Data Collector - the $SDC_CONF/ldap-login.conf file. Add the following KafkaClient login section to the end of the ldap-login.conf file:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="<keytab path>"
          principal="<principal name>/<host name>@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="/etc/security/keytabs/sdc.keytab"
          principal="sdc/sdc-01.streamsets.net@EXAMPLE.COM";
      };
    • Cloudera Manager installation with LDAP authentication - If LDAP authentication is enabled in a Cloudera Manager installation, enable the LDAP Config File Substitutions (ldap.login.file.allow.substitutions) property for the StreamSets service in Cloudera Manager.

      If the Use Safety Valve to Edit LDAP Information (use.ldap.login.file) property is enabled and LDAP authentication is configured in the Data Collector Advanced Configuration Snippet (Safety Valve) for ldap-login.conf field, then add the JAAS configuration properties to the same ldap-login.conf safety valve.

      If LDAP authentication is configured through the LDAP properties rather than the ldap-login.conf safety value, add the JAAS configuration properties to the Data Collector Advanced Configuration Snippet (Safety Valve) for generated-ldap-login-append.conf field.

      Add the following KafkaClient login section to the appropriate field as follows:

      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="_KEYTAB_PATH"
          principal="<principal name>/_HOST@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="_KEYTAB_PATH"
          principal="sdc/_HOST@EXAMPLE.COM";
      };

      Cloudera Manager generates the appropriate keytab path and host name.

  4. On the General tab of the stage, set the Stage Library property to the appropriate Apache Kafka version.
  5. On the Kafka tab, add the security.protocol Kafka configuration property, and set it to SASL_PLAINTEXT.
  6. Then, add the sasl.kerberos.service.name configuration property, and set it to kafka.

For example, the following Kafka properties enable connecting to Kafka with Kerberos:

Enabling SSL/TLS and Kerberos

You can enable the Kafka Consumer origin to use SSL/TLS and Kerberos to connect to Kafka.

To use SSL/TLS and Kerberos, combine the required steps to enable each and set the security.protocol property as follows:
  1. Make sure Kafka is configured to use SSL/TLS and Kerberos (SASL) as described in the following Kafka documentation:
  2. Make sure that Kerberos authentication is enabled for Data Collector, as described in Kerberos Authentication.
  3. Add the Java Authentication and Authorization Service (JAAS) configuration properties required for Kafka clients based on your installation and authentication type:
    • RPM, tarball, or Cloudera Manager installation without LDAP authentication - If Data Collector does not use LDAP authentication, create a separate JAAS configuration file on the Data Collector machine. Add the following KafkaClient login section to the file:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="<keytab path>"
          principal="<principal name>/<host name>@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="/etc/security/keytabs/sdc.keytab"
          principal="sdc/sdc-01.streamsets.net@EXAMPLE.COM";
      };
      Then modify the SDC_JAVA_OPTS environment variable to include the following option that defines the path to the JAAS configuration file:
      -Djava.security.auth.login.config=<JAAS config path>

      Modify environment variables using the method required by your installation type.

    • RPM or tarball installation with LDAP authentication - If LDAP authentication is enabled in an RPM or tarball installation, add the properties to the JAAS configuration file used by Data Collector - the $SDC_CONF/ldap-login.conf file. Add the following KafkaClient login section to the end of the ldap-login.conf file:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="<keytab path>"
          principal="<principal name>/<host name>@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="/etc/security/keytabs/sdc.keytab"
          principal="sdc/sdc-01.streamsets.net@EXAMPLE.COM";
      };
    • Cloudera Manager installation with LDAP authentication - If LDAP authentication is enabled in a Cloudera Manager installation, enable the LDAP Config File Substitutions (ldap.login.file.allow.substitutions) property for the StreamSets service in Cloudera Manager.

      If the Use Safety Valve to Edit LDAP Information (use.ldap.login.file) property is enabled and LDAP authentication is configured in the Data Collector Advanced Configuration Snippet (Safety Valve) for ldap-login.conf field, then add the JAAS configuration properties to the same ldap-login.conf safety valve.

      If LDAP authentication is configured through the LDAP properties rather than the ldap-login.conf safety value, add the JAAS configuration properties to the Data Collector Advanced Configuration Snippet (Safety Valve) for generated-ldap-login-append.conf field.

      Add the following KafkaClient login section to the appropriate field as follows:

      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="_KEYTAB_PATH"
          principal="<principal name>/_HOST@<realm>";
      };
      For example:
      KafkaClient {
          com.sun.security.auth.module.Krb5LoginModule required
          useKeyTab=true
          keyTab="_KEYTAB_PATH"
          principal="sdc/_HOST@EXAMPLE.COM";
      };

      Cloudera Manager generates the appropriate keytab path and host name.

  4. On the General tab of the stage, set the Stage Library property to the appropriate Apache Kafka version.
  5. On the Kafka tab, add the security.protocol property and set it to SASL_SSL.
  6. Then, add the sasl.kerberos.service.name configuration property, and set it to kafka.
  7. Then add and configure the following SSL Kafka properties:
    • ssl.truststore.location
    • ssl.truststore.password
    When the Kafka broker requires client authentication - when the ssl.client.auth broker property is set to "required" - add and configure the following properties:
    • ssl.keystore.location
    • ssl.keystore.password
    • ssl.key.password
    Some brokers might require adding the following properties as well:
    • ssl.enabled.protocols
    • ssl.truststore.type
    • ssl.keystore.type

    For details about these properties, see the Kafka documentation.

Data Formats

The Kafka Consumer origin processes data differently based on the data format. Kafka Consumer can process the following types of data:

Avro
Generates a record for every message. Includes a "precision" and "scale" field attribute for each Decimal field. For more information about field attributes, see Field Attributes.
The origin writes the Avro schema to an avroSchema record header attribute. For more information about record header attributes, see Record Header Attributes.
You can use one of the following methods to specify the location of the Avro schema definition:
  • Message/Data Includes Schema - Use the schema in the message.
  • In Pipeline Configuration - Use the schema that you provide in the stage configuration.
  • Confluent Schema Registry - Retrieve the schema from Confluent Schema Registry. The Confluent Schema Registry is a distributed storage layer for Avro schemas. You can configure the origin to look up the schema in the Confluent Schema Registry by the schema ID embedded in the message or by the schema ID or subject specified in the stage configuration.

    You must specify the method that the origin uses to deserialize the message. If the Avro schema ID is embedded in each message, set the key and value deserializers to Confluent on the Kafka tab.

Using a schema in the stage configuration or retrieving a schema from the Confluent Schema Registry overrides any schema that might be included in the message and can improve performance.
Binary
Generates a record with a single byte array field at the root of the record.
When the data exceeds the user-defined maximum data size, the origin cannot process the data. Because the record is not created, the origin cannot pass the record to the pipeline to be written as an error record. Instead, the origin generates a stage error.
Datagram
Generates a record for every message. The origin can process collectd messages, NetFlow 5 and NetFlow 9 messages, and the following types of syslog messages:
  • RFC 5424
  • RFC 3164
  • Non-standard common messages, such as RFC 3339 dates with no version digit
When processing NetFlow messages, the stage generates different records based on the NetFlow version. When processing NetFlow 9, the records are generated based on the NetFlow 9 configuration properties. For more information, see NetFlow Data Processing.
Delimited
Generates a record for each delimited line. You can use the following delimited format types:
  • Default CSV - File that includes comma-separated values. Ignores empty lines in the file.
  • RFC4180 CSV - Comma-separated file that strictly follows RFC4180 guidelines.
  • MS Excel CSV - Microsoft Excel comma-separated file.
  • MySQL CSV - MySQL comma-separated file.
  • PostgreSQL CSV - PostgreSQL comma-separated file.
  • PostgreSQL Text - PostgreSQL text file.
  • Tab-Separated Values - File that includes tab-separated values.
  • Custom - File that uses user-defined delimiter, escape, and quote characters.
You can use a list or list-map root field type for delimited data, optionally including the header information when available. For more information about the root field types, see Delimited Data Root Field Type.
When using a header line, you can allow processing records with additional columns. The additional columns are named using a custom prefix and integers in sequential increasing order, such as _extra_1, _extra_2. When you disallow additional columns when using a header line, records that include additional columns are sent to error.
You can also replace a string constant with null values.
When a record exceeds the maximum record length defined for the origin, the origin processes the object based on the error handling configured for the stage.
JSON
Generates a record for each JSON object. You can process JSON files that include multiple JSON objects or a single JSON array.
When an object exceeds the maximum object length defined for the origin, the origin processes the object based on the error handling configured for the stage.
Log
Generates a record for every log line.
When a line exceeds the user-defined maximum line length, the origin truncates longer lines.
You can include the processed log line as a field in the record. If the log line is truncated, and you request the log line in the record, the origin includes the truncated line.
You can define the log format or type to be read.
Protobuf
Generates a record for every protobuf message. By default, the origin assumes messages contain multiple protobuf messages.
Protobuf messages must match the specified message type and be described in the descriptor file.
When the data for a record exceeds 1 MB, the origin cannot continue processing data in the message. The origin handles the message based on the stage error handling property and continues reading the next message.
For information about generating the descriptor file, see Protobuf Data Format Prerequisites.
SDC Record
Generates a record for every record. Use to process records generated by a Data Collector pipeline using the SDC Record data format.
For error records, the origin provides the original record as read from the origin in the original pipeline, as well as error information that you can use to correct the record.
When processing error records, the origin expects the error file names and contents as generated by the original pipeline.
Text
Generates a record for each line of text or for each section of text based on a custom delimiter.
When a line or section exceeds the maximum line length defined for the origin, the origin truncates it. The origin adds a boolean field named Truncated to indicate if the line was truncated.
For more information about processing text with a custom delimiter, see Text Data Format with Custom Delimiters.
XML
Generates records based on a user-defined delimiter element. Use an XML element directly under the root element or define a simplified XPath expression. If you do not define a delimiter element, the origin treats the XML file as a single record.
Generated records include XML attributes and namespace declarations as fields in the record by default. You can configure the stage to include them in the record as field attributes.
You can include XPath information for each parsed XML element and XML attribute in field attributes. This also places each namespace in an xmlns record header attribute.
Note: Field attributes and record header attributes are written to destination systems automatically only when you use the SDC RPC data format in destinations. For more information about working with field attributes and record header attributes, and how to include them in records, see Field Attributes and Record Header Attributes.
When a record exceeds the user-defined maximum record length, the origin skips the record and continues processing with the next record. It sends the skipped record to the pipeline for error handling.
Use the XML data format to process valid XML documents. For more information about XML processing, see Reading and Processing XML Data.
Tip: If you want to process invalid XML documents, you can try using the text data format with custom delimiters. For more information, see Processing XML Data with Custom Delimiters.

Configuring a Kafka Consumer

Configure a Kafka Consumer origin to read messages from a Kafka cluster.

When you configure the Kafka Consumer, you configure the general properties, including Kafka and ZooKeeper details. Configure additional data format properties as needed. You can optionally add custom Kafka properties.
  1. In the Properties panel, on the General tab, configure the following properties:
    General Property Description
    Name Stage name.
    Description Optional description.
    Stage Library Library version that you want to use.
    On Record Error Error record handling for the stage:
    • Discard - Discards the record.
    • Send to Error - Sends the record to the pipeline for error handling.
    • Stop Pipeline - Stops the pipeline. Not valid for cluster pipelines.
  2. On the Kafka tab, configure the following properties:
    Kafka Property Description
    Broker URI Connection string for the Kafka broker. Use the following format: <host>:<port>.

    To ensure a connection, enter a comma-separated list of additional broker URIs.

    ZooKeeper URI Connection string for the ZooKeeper of the Kafka cluster. Use the following format: <host>:<port>.

    To use a ZooKeeper quorum, enter a comma-separated list.

    To use a ZooKeeper chroot path, add the path at the end of the list as follows:
    <host>:<port>, <host2>:<port2>, .../<chroot_path>
    Consumer Group Kafka consumer group that the Data Collector belongs to.
    Topic Kafka topic to read.
    Produce Single Record For each partition, generates a single record for records that include multiple objects.

    When not selected, the origin generates multiple records when a record includes multiple objects.

    Max Batch Size (records) Maximum number of records processed at one time. Honors values up to the Data Collector maximum batch size.

    Default is 1000. The Data Collector default is 1000.

    Batch Wait Time (ms) Number of milliseconds to wait before sending a partial or empty batch.
    Rate Limit Per Partition (Kafka messages)

    The maximum number of messages to read per batch per partition. This property is used only in cluster mode and helps to approximate the effective batch size for a Kafka origin.

    Auto Offset Reset Method to determine first message to read when no offset exists for the combination of consumer group and topic:
    • Earliest - Reads messages starting with the first messages in the topic.
    • Latest - Reads messages starting with the last message in the topic.
    • None - Generates an error if no offset exists.
    • Timestamp - Reads messages starting with the timestamp specified in the Auto Offset Reset Timestamp property.

      You must be using Kafka version 0.10.1.0 or later to read messages based on timestamp.

    Default is Earliest.

    Auto Offset Reset Timestamp (ms) Timestamp of earliest message read when no offset exists for the origin. Specify in milliseconds since epoch (January 1, 1970). Available when using the Timestamp method to determine first message to read.
    Kafka Configuration

    Additional Kafka configuration properties to use. Using simple or bulk edit mode, click the Add icon to add properties. Define the Kafka property name and value.

    Use the property names and values as expected by Kafka.

    For information about enabling secure connections to Kafka, see Enabling Security.

    Include Timestamps Includes Kafka timestamps in the record header. The origin retrieves the timestamp from Kafka. If the Kafka message does not have timestamps, the origin leaves the timestamp attribute in the record header empty. When the pipeline writes to multiple Kafka clusters, enable this property to keep timestamps consistent across clusters.

    You must be using Kafka version 0.10 or later to include Kafka timestamps in the record header.

  3. On the Data Format tab, configure the following property:
    Data Format Property Description
    Data Format Type of data to be read. Use one of the following options:
    • Avro
    • Binary
    • Datagram
    • Delimited
    • JSON
    • Log
    • Protobuf
    • SDC Record
    • Text
    • XML
  4. For Avro data, on the Data Format tab, configure the following properties:
    Avro Property Description
    Avro Schema Location Location of the Avro schema definition to use when processing data:
    • Message/Data Includes Schema - Use the schema in the message.
    • In Pipeline Configuration - Use the schema provided in the stage configuration.
    • Confluent Schema Registry - Retrieve the schema from the Confluent Schema Registry.

    Using a schema in the stage configuration or in the Confluent Schema Registry can improve performance.

    Avro Schema Avro schema definition used to process the data. Overrides any existing schema definitions associated with the data.

    You can optionally use the runtime:loadResource function to use a schema definition stored in a runtime resource file.

    Schema Registry URLs Confluent Schema Registry URLs used to look up the schema. To add a URL, click Add. Use the following format to enter the URL:
    http://<host name>:<port number>
    Lookup Schema By Method used to look up the schema in the Confluent Schema Registry:
    • Subject - Look up the specified Avro schema subject.
    • Schema ID - Look up the specified Avro schema ID.
    • Embedded Schema ID - Look up the Avro schema ID embedded in each message.
    Overrides any existing schema definitions associated with the message.
    Schema Subject Avro schema subject to look up in the Confluent Schema Registry.

    If the specified subject has multiple schema versions, the origin uses the latest schema version for that subject. To use an older version, find the corresponding schema ID, and then set the Look Up Schema By property to Schema ID.

    Schema ID Avro schema ID to look up in the Confluent Schema Registry.
  5. For binary data, on the Data Format tab and configure the following property:
    Binary Property Description
    Max Data Size (bytes) Maximum number of bytes in the message. Larger messages cannot be processed or written to error.
  6. For datagram data, on the Data Format tab, configure the following properties:
    Datagram Properties Description
    Datagram Packet Format Packet format of the data:
    • collectd
    • NetFlow
    • syslog
    • Raw/separated data
    TypesDB File Path Path to a user-provided types.db file. Overrides the default types.db file.

    For collectd data only.

    Convert Hi-Res Time & Interval Converts the collectd high resolution time format interval and timestamp to UNIX time, in milliseconds.

    For collectd data only.

    Exclude Interval Excludes the interval field from output record.

    For collectd data only.

    Auth File Path to an optional authentication file. Use an authentication file to accept signed and encrypted data.

    For collectd data only.

    Record Generation Mode Determines the type of values to include in the record. Select one of the following options:
    • Raw Only
    • Interpreted Only
    • Both Raw and Interpreted

    For NetFlow 9 data only.

    Max Templates in Cache The maximum number of templates to store in the template cache. For more information about templates, see Caching NetFlow 9 Templates.

    Default is -1 for an unlimited cache size.

    For NetFlow 9 data only.

    Template Cache Timeout (ms) The maximum number of milliseconds to cache an idle template. Templates unused for more than the specified time are evicted from the cache. For more information about templates, see Caching NetFlow 9 Templates.

    Default is -1 for caching templates indefinitely.

    For NetFlow 9 data only.

    Charset Character encoding of the messages to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.
  7. For delimited data, on the Data Format tab, configure the following properties:
    Delimited Property Description
    Delimiter Format Type Delimiter format type. Use one of the following options:
    • Default CSV - File that includes comma-separated values. Ignores empty lines in the file.
    • RFC4180 CSV - Comma-separated file that strictly follows RFC4180 guidelines.
    • MS Excel CSV - Microsoft Excel comma-separated file.
    • MySQL CSV - MySQL comma-separated file.
    • PostgreSQL CSV - PostgreSQL comma-separated file.
    • PostgreSQL Text - PostgreSQL text file.
    • Tab-Separated Values - File that includes tab-separated values.
    • Custom - File that uses user-defined delimiter, escape, and quote characters.
    Header Line Indicates whether a file contains a header line, and whether to use the header line.
    Allow Extra Columns When processing data with a header line, allows processing records with more columns than exist in the header line.
    Extra Column Prefix Prefix to use for any additional columns. Extra columns are named using the prefix and sequential increasing integers as follows: <prefix><integer>.

    For example, _extra_1. Default is _extra_.

    Max Record Length (chars) Maximum length of a record in characters. Longer records are not read.

    This property can be limited by the Data Collector parser buffer size. For more information, see Maximum Record Size.

    Delimiter Character Delimiter character for a custom delimiter format. Select one of the available options or use Other to enter a custom character.

    You can enter a Unicode control character using the format \uNNNN, where ​N is a hexadecimal digit from the numbers 0-9 or the letters A-F. For example, enter \u0000 to use the null character as the delimiter or \u2028 to use a line separator as the delimiter.

    Default is the pipe character ( | ).

    Escape Character Escape character for a custom file type.
    Quote Character Quote character for a custom file type.
    Root Field Type Root field type to use:
    • List-Map - Generates an indexed list of data. Enables you to use standard functions to process data. Use for new pipelines.
    • List - Generates a record with an indexed list with a map for header and value. Requires the use of delimited data functions to process data. Use only to maintain pipelines created before 1.1.0.
    Lines to Skip Lines to skip before reading data.
    Parse NULLs Replaces the specified string constant with null values.
    NULL Constant String constant to replace with null values.
    Charset Character encoding of the files to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.
  8. For JSON data, on the Data Format tab, configure the following properties:
    JSON Property Description
    JSON Content Type of JSON content. Use one of the following options:
    • Array of Objects
    • Multiple Objects
    Maximum Object Length (chars) Maximum number of characters in a JSON object.

    Longer objects are diverted to the pipeline for error handling.

    This property can be limited by the Data Collector parser buffer size. For more information, see Maximum Record Size.

    Charset Character encoding of the files to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.
  9. For log data, on the Data Format tab, configure the following properties:
    Log Property Description
    Log Format Format of the log files. Use one of the following options:
    • Common Log Format
    • Combined Log Format
    • Apache Error Log Format
    • Apache Access Log Custom Format
    • Regular Expression
    • Grok Pattern
    • Log4j
    • Common Event Format (CEF)
    • Log Event Extended Format (LEEF)
    Max Line Length Maximum length of a log line. The origin truncates longer lines.

    This property can be limited by the Data Collector parser buffer size. For more information, see Maximum Record Size.

    Retain Original Line Determines how to treat the original log line. Select to include the original log line as a field in the resulting record.

    By default, the original line is discarded.

    Charset Character encoding of the files to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.
    • When you select Apache Access Log Custom Format, use Apache log format strings to define the Custom Log Format.
    • When you select Regular Expression, enter the regular expression that describes the log format, and then map the fields that you want to include to each regular expression group.
    • When you select Grok Pattern, you can use the Grok Pattern Definition field to define custom grok patterns. You can define a pattern on each line.

      In the Grok Pattern field, enter the pattern to use to parse the log. You can use a predefined grok patterns or create a custom grok pattern using patterns defined in Grok Pattern Definition.

      For more information about defining grok patterns and supported grok patterns, see Defining Grok Patterns.

    • When you select Log4j, define the following properties:
      Log4j Property Description
      On Parse Error Determines how to handle information that cannot be parsed:
      • Skip and Log Error - Skips reading the line and logs a stage error.
      • Skip, No Error - Skips reading the line and does not log an error.
      • Include as Stack Trace - Includes information that cannot be parsed as a stack trace to the previously-read log line. The information is added to the message field for the last valid log line.
      Use Custom Log Format Allows you to define a custom log format.
      Custom Format Use log4j variables to define a custom log format.
  10. For protobuf data, on the Data Format tab, configure the following properties:
    Protobuf Property Description
    Protobuf Descriptor File Descriptor file (.desc) to use. The descriptor file must be in the Data Collector resources directory, $SDC_RESOURCES.

    For information about generating the descriptor file, see Protobuf Data Format Prerequisites. For more information about environment variables, see Data Collector Environment Configuration.

    Message Type The fully-qualified name for the message type to use when reading data.

    Use the following format: <package name>.<message type>.

    Use a message type defined in the descriptor file.
    Delimited Messages Indicates if a message might include more than one protobuf message.
  11. For text data, on the Data Format tab, configure the following properties:
    Text Property Description
    Max Line Length Maximum number of characters allowed for a line. Longer lines are truncated.

    Adds a boolean field to the record to indicate if it was truncated. The field name is Truncated.

    This property can be limited by the Data Collector parser buffer size. For more information, see Maximum Record Size.

    Use Custom Delimiter Uses custom delimiters to define records instead of line breaks.
    Custom Delimiter One or more characters to use to define records.
    Include Custom Delimiter Includes delimiter characters in the record.
    Charset Character encoding of the files to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.
  12. For XML data, on the Data Format tab, configure the following properties:
    XML Property Description
    Delimiter Element
    Delimiter to use to generate records. Omit a delimiter to treat the entire XML document as one record. Use one of the following:
    • An XML element directly under the root element.

      Use the XML element name without surrounding angle brackets ( < > ) . For example, msg instead of <msg>.

    • A simplified XPath expression that specifies the data to use.

      Use a simplified XPath expression to access data deeper in the XML document or data that requires a more complex access method.

      For more information about valid syntax, see Simplified XPath Syntax.

    Include Field XPaths Includes the XPath to each parsed XML element and XML attribute in field attributes. Also includes each namespace in an xmlns record header attribute.

    When not selected, this information is not included in the record. By default, the property is not selected.

    Note: Field attributes and record header attributes are written to destination systems automatically only when you use the SDC RPC data format in destinations. For more information about working with field attributes and record header attributes, and how to include them in records, see Field Attributes and Record Header Attributes.
    Namespaces Namespace prefix and URI to use when parsing the XML document. Define namespaces when the XML element being used includes a namespace prefix or when the XPath expression includes namespaces.

    For information about using namespaces with an XML element, see Using XML Elements with Namespaces.

    For information about using namespaces with XPath expressions, see Using XPath Expressions with Namespaces.

    Using simple or bulk edit mode, click the Add icon to add additional namespaces.

    Output Field Attributes Includes XML attributes and namespace declarations in the record as field attributes. When not selected, XML attributes and namespace declarations are included in the record as fields.
    Note: Field attributes are automatically included in records written to destination systems only when you use the SDC RPC data format in the destination. For more information about working with field attributes, see Field Attributes.

    By default, the property is not selected.

    Max Record Length (chars)

    The maximum number of characters in a record. Longer records are diverted to the pipeline for error handling.

    This property can be limited by the Data Collector parser buffer size. For more information, see Maximum Record Size.

    Charset Character encoding of the files to be processed.
    Ignore Ctrl Characters Removes all ASCII control characters except for the tab, line feed, and carriage return characters.