becketqin opened a new pull request, #25525:
URL: https://github.com/apache/beam/pull/25525
This is the first patch of migrating Flink runner batch job execution from
DataSet to DataStream API.
The patch does the following:
1. Add two FLIP-27 source implementations: `FlinkBoundedSource`,
`FlinkUnboundedSource`. ImpulseSource was implemented as a built-in type of
FlinkBoundedSource.
2. Introduce necessary compatibility bridging classes to make the code work
for Flink version [1.12, 1.15].
`CHANGES.md` was not modified with this patch because this patch does not
change the existing execution paths. The followup patches will update
`CHANGES.md`.
One notable difference between FLIP-27 Source implementations and the
existing `UnboundedSourceWrapper` class is that the new FLIP-27 source does not
support accumulators yet. So the beam metrics from the `MetricsContainer` will
not be reported. However, the FLIP-27 based sources will emit their own metrics.
fixes #25486
------------------------
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