public static @interface DoFn.NewWatermarkEstimator
WatermarkEstimator for the watermark state
of a splittable
MyWatermarkEstimator newWatermarkEstimator(<optional arguments>);
If the return type is a subtype of
TimestampObservingWatermarkEstimator then the
timestamp of each element output from this DoFn is provided to the watermark estimator.
This method must satisfy the following constraints:
WatermarkEstimator<WatermarkEstimatorStateT>. It is suggested to use as narrow of a
return type definition as possible (for example prefer to use a square type over a shape
type as a square is a type of a shape).
then it will be passed the current watermark estimator state; the argument must be of
DoFn.Element annotation, then it will be
passed the current element being processed; the argument must be of type
Note that automatic conversion of
DoFn.FieldAccess parameters are
DoFn.Restriction annotation, then it will
be passed the current restriction being processed; the argument must be of type
DoFn.Timestamp annotation, then it will be
passed the timestamp of the current element being processed; the argument must be of type
BoundedWindow, then it will be passed the
window of the current element. When applied by
ParDo the subtype of
BoundedWindow must match the type of windows on the input
PCollection. If the
window is not accessed a runner may perform additional optimizations.
PaneInfo, then it will be passed information
about the current triggering pane.
PipelineOptions, then it will be passed the
options for the current pipeline.