@Override
@SuppressWarnings("unchecked")
public void translateNode(
Combine.PerKey<K, InputT, OutputT> transform, FlinkBatchTranslationContext context) {
DataSet<WindowedValue<KV<K, InputT>>> inputDataSet =
context.getInputDataSet(context.getInput(transform));
CombineFnBase.PerKeyCombineFn<K, InputT, AccumT, OutputT> combineFn =
(CombineFnBase.PerKeyCombineFn<K, InputT, AccumT, OutputT>) transform.getFn();
KvCoder<K, InputT> inputCoder = (KvCoder<K, InputT>) context.getInput(transform).getCoder();
Coder<AccumT> accumulatorCoder;
try {
accumulatorCoder =
combineFn.getAccumulatorCoder(
context.getInput(transform).getPipeline().getCoderRegistry(),
inputCoder.getKeyCoder(),
inputCoder.getValueCoder());
} catch (CannotProvideCoderException e) {
throw new RuntimeException(e);
}
WindowingStrategy<?, ?> windowingStrategy =
context.getInput(transform).getWindowingStrategy();
TypeInformation<WindowedValue<KV<K, AccumT>>> partialReduceTypeInfo =
context.getTypeInfo(
KvCoder.of(inputCoder.getKeyCoder(), accumulatorCoder), windowingStrategy);
Grouping<WindowedValue<KV<K, InputT>>> inputGrouping =
inputDataSet.groupBy(new KvKeySelector<InputT, K>(inputCoder.getKeyCoder()));
// construct a map from side input to WindowingStrategy so that
// the OldDoFn runner can map main-input windows to side input windows
Map<PCollectionView<?>, WindowingStrategy<?, ?>> sideInputStrategies = new HashMap<>();
for (PCollectionView<?> sideInput : transform.getSideInputs()) {
sideInputStrategies.put(sideInput, sideInput.getWindowingStrategyInternal());
}
if (windowingStrategy.getWindowFn().isNonMerging()) {
WindowingStrategy<?, BoundedWindow> boundedStrategy =
(WindowingStrategy<?, BoundedWindow>) windowingStrategy;
FlinkPartialReduceFunction<K, InputT, AccumT, ?> partialReduceFunction =
new FlinkPartialReduceFunction<>(
combineFn, boundedStrategy, sideInputStrategies, context.getPipelineOptions());
FlinkReduceFunction<K, AccumT, OutputT, ?> reduceFunction =
new FlinkReduceFunction<>(
combineFn, boundedStrategy, sideInputStrategies, context.getPipelineOptions());
// Partially GroupReduce the values into the intermediate format AccumT (combine)
GroupCombineOperator<WindowedValue<KV<K, InputT>>, WindowedValue<KV<K, AccumT>>>
groupCombine =
new GroupCombineOperator<>(
inputGrouping,
partialReduceTypeInfo,
partialReduceFunction,
"GroupCombine: " + transform.getName());
transformSideInputs(transform.getSideInputs(), groupCombine, context);
TypeInformation<WindowedValue<KV<K, OutputT>>> reduceTypeInfo =
context.getTypeInfo(context.getOutput(transform));
Grouping<WindowedValue<KV<K, AccumT>>> intermediateGrouping =
groupCombine.groupBy(new KvKeySelector<AccumT, K>(inputCoder.getKeyCoder()));
// Fully reduce the values and create output format OutputT
GroupReduceOperator<WindowedValue<KV<K, AccumT>>, WindowedValue<KV<K, OutputT>>>
outputDataSet =
new GroupReduceOperator<>(
intermediateGrouping, reduceTypeInfo, reduceFunction, transform.getName());
transformSideInputs(transform.getSideInputs(), outputDataSet, context);
context.setOutputDataSet(context.getOutput(transform), outputDataSet);
} else {
if (!windowingStrategy.getWindowFn().windowCoder().equals(IntervalWindow.getCoder())) {
throw new UnsupportedOperationException(
"Merging WindowFn with windows other than IntervalWindow are not supported.");
}
// for merging windows we can't to a pre-shuffle combine step since
// elements would not be in their correct windows for side-input access
WindowingStrategy<?, IntervalWindow> intervalStrategy =
(WindowingStrategy<?, IntervalWindow>) windowingStrategy;
FlinkMergingNonShuffleReduceFunction<K, InputT, AccumT, OutputT, ?> reduceFunction =
new FlinkMergingNonShuffleReduceFunction<>(
combineFn, intervalStrategy, sideInputStrategies, context.getPipelineOptions());
TypeInformation<WindowedValue<KV<K, OutputT>>> reduceTypeInfo =
context.getTypeInfo(context.getOutput(transform));
Grouping<WindowedValue<KV<K, InputT>>> grouping =
inputDataSet.groupBy(new KvKeySelector<InputT, K>(inputCoder.getKeyCoder()));
// Fully reduce the values and create output format OutputT
GroupReduceOperator<WindowedValue<KV<K, InputT>>, WindowedValue<KV<K, OutputT>>>
outputDataSet =
new GroupReduceOperator<>(
grouping, reduceTypeInfo, reduceFunction, transform.getName());
transformSideInputs(transform.getSideInputs(), outputDataSet, context);
context.setOutputDataSet(context.getOutput(transform), outputDataSet);
}
}
@Override
public void translateNode(
GroupByKey<K, InputT> transform, FlinkBatchTranslationContext context) {
// for now, this is copied from the Combine.PerKey translater. Once we have the new runner API
// we can replace GroupByKey by a Combine.PerKey with the Concatenate CombineFn
DataSet<WindowedValue<KV<K, InputT>>> inputDataSet =
context.getInputDataSet(context.getInput(transform));
Combine.KeyedCombineFn<K, InputT, List<InputT>, List<InputT>> combineFn =
new Concatenate<InputT>().asKeyedFn();
KvCoder<K, InputT> inputCoder = (KvCoder<K, InputT>) context.getInput(transform).getCoder();
Coder<List<InputT>> accumulatorCoder;
try {
accumulatorCoder =
combineFn.getAccumulatorCoder(
context.getInput(transform).getPipeline().getCoderRegistry(),
inputCoder.getKeyCoder(),
inputCoder.getValueCoder());
} catch (CannotProvideCoderException e) {
throw new RuntimeException(e);
}
WindowingStrategy<?, ?> windowingStrategy =
context.getInput(transform).getWindowingStrategy();
TypeInformation<WindowedValue<KV<K, List<InputT>>>> partialReduceTypeInfo =
new CoderTypeInformation<>(
WindowedValue.getFullCoder(
KvCoder.of(inputCoder.getKeyCoder(), accumulatorCoder),
windowingStrategy.getWindowFn().windowCoder()));
Grouping<WindowedValue<KV<K, InputT>>> inputGrouping =
inputDataSet.groupBy(new KvKeySelector<InputT, K>(inputCoder.getKeyCoder()));
FlinkPartialReduceFunction<K, InputT, List<InputT>, ?> partialReduceFunction;
FlinkReduceFunction<K, List<InputT>, List<InputT>, ?> reduceFunction;
if (windowingStrategy.getWindowFn().isNonMerging()) {
@SuppressWarnings("unchecked")
WindowingStrategy<?, BoundedWindow> boundedStrategy =
(WindowingStrategy<?, BoundedWindow>) windowingStrategy;
partialReduceFunction =
new FlinkPartialReduceFunction<>(
combineFn,
boundedStrategy,
Collections.<PCollectionView<?>, WindowingStrategy<?, ?>>emptyMap(),
context.getPipelineOptions());
reduceFunction =
new FlinkReduceFunction<>(
combineFn,
boundedStrategy,
Collections.<PCollectionView<?>, WindowingStrategy<?, ?>>emptyMap(),
context.getPipelineOptions());
} else {
if (!windowingStrategy.getWindowFn().windowCoder().equals(IntervalWindow.getCoder())) {
throw new UnsupportedOperationException(
"Merging WindowFn with windows other than IntervalWindow are not supported.");
}
@SuppressWarnings("unchecked")
WindowingStrategy<?, IntervalWindow> intervalStrategy =
(WindowingStrategy<?, IntervalWindow>) windowingStrategy;
partialReduceFunction =
new FlinkMergingPartialReduceFunction<>(
combineFn,
intervalStrategy,
Collections.<PCollectionView<?>, WindowingStrategy<?, ?>>emptyMap(),
context.getPipelineOptions());
reduceFunction =
new FlinkMergingReduceFunction<>(
combineFn,
intervalStrategy,
Collections.<PCollectionView<?>, WindowingStrategy<?, ?>>emptyMap(),
context.getPipelineOptions());
}
// Partially GroupReduce the values into the intermediate format AccumT (combine)
GroupCombineOperator<WindowedValue<KV<K, InputT>>, WindowedValue<KV<K, List<InputT>>>>
groupCombine =
new GroupCombineOperator<>(
inputGrouping,
partialReduceTypeInfo,
partialReduceFunction,
"GroupCombine: " + transform.getName());
Grouping<WindowedValue<KV<K, List<InputT>>>> intermediateGrouping =
groupCombine.groupBy(new KvKeySelector<List<InputT>, K>(inputCoder.getKeyCoder()));
// Fully reduce the values and create output format VO
GroupReduceOperator<WindowedValue<KV<K, List<InputT>>>, WindowedValue<KV<K, List<InputT>>>>
outputDataSet =
new GroupReduceOperator<>(
intermediateGrouping, partialReduceTypeInfo, reduceFunction, transform.getName());
context.setOutputDataSet(context.getOutput(transform), outputDataSet);
}