@Documented
@Retention(value=RUNTIME)
@Target(value=METHOD)
public static @interface DoFn.SplitRestriction
DoFn
into multiple parts to
be processed in parallel.
This method is used to perform bulk splitting while a restriction is not actively being
processed while RestrictionTracker.trySplit(double)
is used to perform splitting during
processing.
Signature: void splitRestriction(<arguments>);
This method must satisfy the following constraints:
DoFn.OutputReceiver
, then it will be passed an
output receiver for outputting the splits. All splits must be output through this
parameter.
DoFn.Element
annotation, then it will be
passed the current element being processed; the argument must be of type InputT
.
Note that automatic conversion of Row
s and DoFn.FieldAccess
parameters are
currently unsupported.
DoFn.Restriction
annotation, then it will
be passed the current restriction being processed; the argument must be of type RestrictionT
.
DoFn.Timestamp
annotation, then it will be
passed the timestamp of the current element being processed; the argument must be of type
Instant
.
RestrictionTracker
, then it will be passed a tracker
that is initialized for the current DoFn.Restriction
. The argument must be of the
exact type RestrictionTracker<RestrictionT, PositionT>
.
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.