private <W extends BoundedWindow> WindowingStrategy<?, W> getOutputWindowing(
WindowingStrategy<?, W> inputStrategy) {
if (inputStrategy.getWindowFn() instanceof InvalidWindows) {
@SuppressWarnings("unchecked")
InvalidWindows<W> invalidWindows = (InvalidWindows<W>) inputStrategy.getWindowFn();
return inputStrategy.withWindowFn(invalidWindows.getOriginalWindowFn());
} else {
return inputStrategy;
}
}
@Override
public void validate(PCollection<T> input) {
WindowingStrategy<?, ?> outputStrategy =
getOutputStrategyInternal(input.getWindowingStrategy());
// Make sure that the windowing strategy is complete & valid.
if (outputStrategy.isTriggerSpecified()
&& !(outputStrategy.getTrigger() instanceof DefaultTrigger)) {
if (!(outputStrategy.getWindowFn() instanceof GlobalWindows)
&& !outputStrategy.isAllowedLatenessSpecified()) {
throw new IllegalArgumentException(
"Except when using GlobalWindows,"
+ " calling .triggering() to specify a trigger requires that the allowed lateness be"
+ " specified using .withAllowedLateness() to set the upper bound on how late data"
+ " can arrive before being dropped. See Javadoc for more details.");
}
if (!outputStrategy.isModeSpecified()) {
throw new IllegalArgumentException(
"Calling .triggering() to specify a trigger requires that the accumulation mode be"
+ " specified using .discardingFiredPanes() or .accumulatingFiredPanes()."
+ " See Javadoc for more details.");
}
}
}
@Override
public void translateNode(Window.Bound<T> transform, FlinkBatchTranslationContext context) {
PValue input = context.getInput(transform);
TypeInformation<WindowedValue<T>> resultTypeInfo =
context.getTypeInfo(context.getOutput(transform));
DataSet<WindowedValue<T>> inputDataSet = context.getInputDataSet(input);
@SuppressWarnings("unchecked")
final WindowingStrategy<T, ? extends BoundedWindow> windowingStrategy =
(WindowingStrategy<T, ? extends BoundedWindow>)
context.getOutput(transform).getWindowingStrategy();
WindowFn<T, ? extends BoundedWindow> windowFn = windowingStrategy.getWindowFn();
FlinkAssignWindows<T, ? extends BoundedWindow> assignWindowsFunction =
new FlinkAssignWindows<>(windowFn);
DataSet<WindowedValue<T>> resultDataSet =
inputDataSet
.flatMap(assignWindowsFunction)
.name(context.getOutput(transform).getName())
.returns(resultTypeInfo);
context.setOutputDataSet(context.getOutput(transform), resultDataSet);
}
@Override
public void translateNode(
ParDo.BoundMulti<InputT, OutputT> transform, FlinkBatchTranslationContext context) {
DoFn<InputT, OutputT> doFn = transform.getFn();
rejectStateAndTimers(doFn);
DataSet<WindowedValue<InputT>> inputDataSet =
context.getInputDataSet(context.getInput(transform));
List<TaggedPValue> outputs = context.getOutputs(transform);
Map<TupleTag<?>, Integer> outputMap = Maps.newHashMap();
// put the main output at index 0, FlinkMultiOutputDoFnFunction expects this
outputMap.put(transform.getMainOutputTag(), 0);
int count = 1;
for (TaggedPValue taggedValue : outputs) {
if (!outputMap.containsKey(taggedValue.getTag())) {
outputMap.put(taggedValue.getTag(), count++);
}
}
// assume that the windowing strategy is the same for all outputs
WindowingStrategy<?, ?> windowingStrategy = null;
// collect all output Coders and create a UnionCoder for our tagged outputs
List<Coder<?>> outputCoders = Lists.newArrayList();
for (TaggedPValue taggedValue : outputs) {
checkState(
taggedValue.getValue() instanceof PCollection,
"Within ParDo, got a non-PCollection output %s of type %s",
taggedValue.getValue(),
taggedValue.getValue().getClass().getSimpleName());
PCollection<?> coll = (PCollection<?>) taggedValue.getValue();
outputCoders.add(coll.getCoder());
windowingStrategy = coll.getWindowingStrategy();
}
if (windowingStrategy == null) {
throw new IllegalStateException("No outputs defined.");
}
UnionCoder unionCoder = UnionCoder.of(outputCoders);
TypeInformation<WindowedValue<RawUnionValue>> typeInformation =
new CoderTypeInformation<>(
WindowedValue.getFullCoder(
unionCoder, windowingStrategy.getWindowFn().windowCoder()));
List<PCollectionView<?>> sideInputs = transform.getSideInputs();
// 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 : sideInputs) {
sideInputStrategies.put(sideInput, sideInput.getWindowingStrategyInternal());
}
@SuppressWarnings("unchecked")
FlinkMultiOutputDoFnFunction<InputT, OutputT> doFnWrapper =
new FlinkMultiOutputDoFnFunction(
doFn,
windowingStrategy,
sideInputStrategies,
context.getPipelineOptions(),
outputMap);
MapPartitionOperator<WindowedValue<InputT>, WindowedValue<RawUnionValue>> taggedDataSet =
new MapPartitionOperator<>(
inputDataSet, typeInformation, doFnWrapper, transform.getName());
transformSideInputs(sideInputs, taggedDataSet, context);
for (TaggedPValue output : outputs) {
pruneOutput(
taggedDataSet,
context,
outputMap.get(output.getTag()),
(PCollection) output.getValue());
}
}
@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);
}