src/main/java/io/reactivex/Completable.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    @BackpressureSupport(BackpressureKind.FULL)
    public static Completable mergeDelayError(Publisher<? extends CompletableSource> sources, int maxConcurrency) {
        return merge0(sources, maxConcurrency, true);
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    @BackpressureSupport(BackpressureKind.FULL)
    public static Completable mergeDelayError(Publisher<? extends CompletableSource> sources, int maxConcurrency) {
        return merge0(sources, maxConcurrency, true);
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . NONE ) @ BackpressureSupport ( BackpressureKind . FULL ) public static Completable mergeDelayError ( Publisher < ? extends CompletableSource > sources , int maxConcurrency ) { return merge0 ( sources , maxConcurrency , true ) ; }
Returns a Completable that subscribes to a limited number of inner Completables at once in
the source sequence and delays any error emitted by either the sources
observable or any of the inner Completables until all of
them terminate in a way or another.
<p>
<img width="640" height="440" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeDelayError.pn.png" alt="">
<dl>
<dt><b>Backpressure:</b></dt>
<dd>The returned {@code Completable} honors the backpressure of the downstream consumer
and expects the other {@code Publisher} to honor it as well.</dd>
<dt><b>Scheduler:</b></dt>
<dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@param sources the sequence of Completables
@param maxConcurrency the maximum number of concurrent subscriptions to Completables
@return the new Completable instance
@throws NullPointerException if sources is null
Returns a Completable that subscribes to a limited number of inner Completables at once in the source sequence and delays any error emitted by either the sources observable or any of the inner Completables until all of them terminate in a way or another . <p > <img width = 640 height = 440 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / Completable . mergeDelayError . pn . png alt = > <dl > <dt > <b > Backpressure : < / b > < / dt > <dd > The returned {