apache_beam.io.external.generate_sequence module

class apache_beam.io.external.generate_sequence.GenerateSequence(start, stop=None, elements_per_period=None, max_read_time=None, expansion_service=None)

Bases: apache_beam.transforms.external.ExternalTransform

An external PTransform which provides a bounded or unbounded stream of integers.

Note: To use this transform, you need to start the Java expansion service. Please refer to the portability documentation on how to do that. The expansion service address has to be provided when instantiating this transform. During pipeline translation this transform will be replaced by the Java SDK’s GenerateSequence.

If you start Flink’s job server, the expansion service will be started on port 8097. This is also the configured default for this transform. For a different address, please set the expansion_service parameter.

For more information see: - https://beam.apache.org/documentation/runners/flink/ - https://beam.apache.org/roadmap/portability/

Note: Runners need to support translating Read operations in order to use this source. At the moment only the Flink Runner supports this.

Experimental; no backwards compatibility guarantees.

URN = 'beam:external:java:generate_sequence:v1'