public static class Combine.PerKeyWithHotKeyFanout<K,InputT,OutputT> extends PTransform<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>
Combine.PerKey
, but sharding the combining of hot keys.name
Modifier and Type | Method and Description |
---|---|
PCollection<KV<K,OutputT>> |
expand(PCollection<KV<K,InputT>> input)
Applies this
PTransform on the given InputT , and returns its
Output . |
protected java.lang.String |
getKindString()
Returns the name to use by default for this
PTransform
(not including the names of any enclosing PTransform s). |
void |
populateDisplayData(DisplayData.Builder builder)
Register display data for the given transform or component.
|
getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getName, toString, validate
protected java.lang.String getKindString()
PTransform
PTransform
(not including the names of any enclosing PTransform
s).
By default, returns the base name of this PTransform
's class.
The caller is responsible for ensuring that names of applied
PTransform
s are unique, e.g., by adding a uniquifying
suffix when needed.
getKindString
in class PTransform<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>
public PCollection<KV<K,OutputT>> expand(PCollection<KV<K,InputT>> input)
PTransform
PTransform
on the given InputT
, and returns its
Output
.
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<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>
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<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>
builder
- The builder to populate with display data.HasDisplayData