public StringifiedAccumulatorResult[] getAggregatedUserAccumulatorsStringified() {
Map<String, Accumulator<?, ?>> userAccumulators = new HashMap<String, Accumulator<?, ?>>();
for (ExecutionVertex vertex : taskVertices) {
Map<String, Accumulator<?, ?>> next =
vertex.getCurrentExecutionAttempt().getUserAccumulators();
if (next != null) {
AccumulatorHelper.mergeInto(userAccumulators, next);
}
}
return StringifiedAccumulatorResult.stringifyAccumulatorResults(userAccumulators);
}
public JobExecutionResult execute(Plan program) throws Exception {
long startTime = System.currentTimeMillis();
initCache(program.getCachedFiles());
Collection<? extends GenericDataSinkBase<?>> sinks = program.getDataSinks();
for (Operator<?> sink : sinks) {
execute(sink);
}
long endTime = System.currentTimeMillis();
Map<String, Object> accumulatorResults = AccumulatorHelper.toResultMap(accumulators);
return new JobExecutionResult(null, endTime - startTime, accumulatorResults);
}
@Override
protected <AggInputT, AggOutputT> Aggregator<AggInputT, AggOutputT> createAggregatorInternal(
String name, Combine.CombineFn<AggInputT, ?, AggOutputT> combiner) {
Accumulator acc = getRuntimeContext().getAccumulator(name);
if (acc != null) {
AccumulatorHelper.compareAccumulatorTypes(
name, SerializableFnAggregatorWrapper.class, acc.getClass());
return (Aggregator<AggInputT, AggOutputT>) acc;
}
SerializableFnAggregatorWrapper<AggInputT, AggOutputT> accumulator =
new SerializableFnAggregatorWrapper<>(combiner);
getRuntimeContext().addAccumulator(name, accumulator);
return accumulator;
}