reactor-core/src/main/java/reactor/core/publisher/ParallelFlux.java
public final ParallelFlux<T> doOnError(Consumer<? super Throwable> onError) {
		Objects.requireNonNull(onError, "onError");
		return doOnSignal(this, null, null, onError, null, null, null, null, null);
	}
public final ParallelFlux<T> doOnError(Consumer<? super Throwable> onError) {
		Objects.requireNonNull(onError, "onError");
		return doOnSignal(this, null, null, onError, null, null, null, null, null);
	}
Call the specified consumer with the exception passing through any 'rail'.

@param onError the callback

@return the new {@link ParallelFlux} instance