src/main/java/io/reactivex/parallel/ParallelFlowable.java
@BackpressureSupport(BackpressureKind.FULL)
    @SchedulerSupport(SchedulerSupport.NONE)
    @CheckReturnValue
    @NonNull
    public final Flowable<T> sequentialDelayError(int prefetch) {
        ObjectHelper.verifyPositive(prefetch, "prefetch");
        return RxJavaPlugins.onAssembly(new ParallelJoin<T>(this, prefetch, true));
    }
@BackpressureSupport(BackpressureKind.FULL)
    @SchedulerSupport(SchedulerSupport.NONE)
    @CheckReturnValue
    @NonNull
    public final Flowable<T> sequentialDelayError(int prefetch) {
        ObjectHelper.verifyPositive(prefetch, "prefetch");
        return RxJavaPlugins.onAssembly(new ParallelJoin<T>(this, prefetch, true));
    }
@ BackpressureSupport ( BackpressureKind . FULL ) @ SchedulerSupport ( SchedulerSupport . NONE ) @ CheckReturnValue @ NonNull public final Flowable < T > sequentialDelayError ( int prefetch ) { ObjectHelper . verifyPositive ( prefetch , "prefetch" ) ; return RxJavaPlugins . onAssembly ( new ParallelJoin < T > ( this , prefetch , true ) ) ; }
Merges the values from each 'rail' in a round-robin or same-order fashion and
exposes it as a regular Publisher sequence, running with a give prefetch value
for the rails and delaying errors from all rails till all terminate.
<img width="640" height="602" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/parallelflowable.sequential.png" alt="">
<dl>
<dt><b>Backpressure:</b></dt>
<dd>The operator honors backpressure.</dd>
<dt><b>Scheduler:</b></dt>
<dd>{@code sequentialDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
<p>History: 2.0.7 - experimental
@param prefetch the prefetch amount to use for each rail
@return the new Flowable instance
@see ParallelFlowable#sequential()
@see ParallelFlowable#sequentialDelayError()
@since 2.2
Merges the values from each rail in a round - robin or same - order fashion and exposes it as a regular Publisher sequence running with a give prefetch value for the rails and delaying errors from all rails till all terminate . <img width = 640 height = 602 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / parallelflowable . sequential . png alt = > <dl > <dt > <b > Backpressure : < / b > < / dt > <dd > The operator honors backpressure . < / dd > <dt > <b > Scheduler : < / b > < / dt > <dd > {