@Documented @Retention(value=RUNTIME) @Target(value=METHOD) @Experimental(value=SPLITTABLE_DO_FN) public static @interface DoFn.GetInitialRestriction
This method must satisfy the following constraints:
RestrictionTdefines the restriction type used within this splittable DoFn. All other methods that use a
@Restrictionparameter must use the same type that is used here. 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).
DoFn.Elementannotation, then it will be passed the current element being processed; the argument must be of type
InputT. Note that automatic conversion of
DoFn.FieldAccessparameters are currently unsupported.
DoFn.Timestampannotation, 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
ParDothe subtype of
BoundedWindowmust 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.