public static class KafkaIO.TypedWithoutMetadata<K,V> extends PTransform<PBegin,PCollection<KV<K,V>>>
PTransform
to read from Kafka topics. Similar to KafkaIO.Read
, but removes
Kafka metatdata and returns a PCollection
of KV
. See KafkaIO
for more
information on usage and configuration of reader.name
Modifier and Type | Method and Description |
---|---|
PCollection<KV<K,V>> |
expand(PBegin begin)
Override this method to specify how this
PTransform should be expanded on the given
InputT . |
void |
populateDisplayData(DisplayData.Builder builder)
Register display data for the given transform or component.
|
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate
public PCollection<KV<K,V>> expand(PBegin begin)
PTransform
PTransform
should be expanded on the given
InputT
.
NOTE: This method should not be called directly. Instead apply the PTransform
should
be applied to the InputT
using the apply
method.
Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).
expand
in class PTransform<PBegin,PCollection<KV<K,V>>>
public void populateDisplayData(DisplayData.Builder builder)
PTransform
populateDisplayData(DisplayData.Builder)
is invoked by Pipeline runners to collect
display data via DisplayData.from(HasDisplayData)
. Implementations may call super.populateDisplayData(builder)
in order to register display data in the current namespace,
but should otherwise use subcomponent.populateDisplayData(builder)
to use the namespace
of the subcomponent.
By default, does not register any display data. Implementors may override this method to provide their own display data.
populateDisplayData
in interface HasDisplayData
populateDisplayData
in class PTransform<PBegin,PCollection<KV<K,V>>>
builder
- The builder to populate with display data.HasDisplayData