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DataStax Pulsar Connector

    • Getting Started
      • About the DataStax Apache Pulsar™ Connector
        • System requirements
      • Pulsar Connector release notes
      • Installing DataStax Apache Pulsar™ Connector
      • Pulsar Connector single instance quick start
    • Guides and examples
      • Configuration
        • Configuring parallelism
        • Specify writetime timestamp column
        • Setting row-level TTL values from Pulsar fields
        • Pass Pulsar Connector settings directly to the DataStax Java driver
        • Mapping pulsar topics to database tables
          • Determining topic data structure
          • Mapping basic messages to table columns
          • Mapping a message that contain JSON fields
            • Mapping a message that contains both basic and JSON fields
            • Mapping JSON messages
          • Mapping Avro messages
          • Extract Pulsar record header values
          • Mapping messages to table that has a User Defined Type
          • Mapping a topic to multiple tables
          • Multiple topics to multiple tables
          • Provide CQL queries in mappings
          • The now() function in mappings
      • Operations
        • About operating and maintaining the DataStax Connector
        • Scaling the DataStax Apache Pulsar™ Connector
        • Changing the topic or table schema
        • Restarting the DataStax Apache Pulsar™ Connector
        • Displaying the DataStax Apache Pulsar™ Connector configuration
        • Updating the DataStax Apache Pulsar™ Connector configuration
        • Deleting the DataStax Apache Pulsar™ Connector
        • Getting the DataStax Connector status
      • Security
        • Using internal or LDAP authentication
      • DataStax Apache Pulsar™ Connector metrics
      • Troubleshooting
        • Record fails to write
        • Writing fails because of mutation size
        • Data parsing fails
        • Loading balancing datacenter is not specified
    • Reference
      • DataStax Apache Pulsar™ Connector details
      • DataStax connection
      • Pulsar topic-to-table settings
      • Converting date and times for a topic
      • Using the DataStax Apache Pulsar™ Connector with DataStax Enterprise authentication
        • Internal or LDAP authentication
      • SSL encrypted connection
      • Configure error handling
  • DataStax Pulsar Connector
  • Guides and examples
  • Configuration
  • Specify writetime timestamp column

Specify writetime timestamp column

In the Apache Pulsar™ topic mapping, you can optionally specify which column should be used to note the timestamp when the Pulsar-produced record was inserted into any of the supported databases.

The mapping setting provides a special property, __timestamp. The format is:

topic:
  my_topic:
    my_ks:
      my_table:
        mapping: 'col1=key.f1, col2=value.f1, __timestamp=value.f2'

By default, the database internally tracks the writetime timestamp of records inserted from Pulsar. However, this __timestamp feature in the mapping supports the scenario where the Pulsar records have an explicit timestamp field that you want to use as a writetime for the database record produced by the connector.

The column value that you use must be a number.

When you map the __timestamp value, you may also want to specify the timeUnit of the provided timestamp. The default is MICROSECONDS. For example, if your column used as the timestamp is in a different format (for example SECONDS) set it to SECONDS. The connector will automatically transform it to the database’s proper numeric timestamp format; that is, to MICROSECONDS. Example:

topic:
  my_topic:
    my_ks:
      my_table:
        timestampTimeUnit: SECONDS
Configuring parallelism Setting row-level TTL values from Pulsar fields

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