[BEAM-17] Add support for new Beam Source API

• Type: Improvement
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: runner-spark
• Assignee: Amit Sela
• Reporter: Amit Sela
• Created: 15/Feb/16 18:16
• Updated: 16/May/20 13:36
• Resolved: 26/Oct/16 18:39

Description

The API is discussed in https://cloud.google.com/dataflow/model/sources-and-sinks#creating-sources

To implement this, we need to add support for com.google.cloud.dataflow.sdk.io.Read in TransformTranslator. This can be done by creating a new SourceInputFormat class that translates from a DF Source to a Hadoop InputFormat. The two concepts are pretty-well aligned since they both have the concept of splits and readers.

Note that when there's a native HadoopSource in DF, it will need special-casing in the code for Read since we'll be able to use the underlying InputFormat directly.

This could be tested using XmlSource from the SDK.

Issue Links

• is duplicated by: BEAM-212 SparkPipelineRunner should support the Read Primitive
• is related to: BEAM-110 Use SDK implementation for HadoopIO in contrib/hadoop