Repeat vs. Retry

Main difference between repeat and retry is event causes a resubscription:

Key points about repeatWhen and retryWhen:

repeatWhen is identical to retryWhen, only it responds to onCompleted instead of onError. The input is Observable<Void>, since onCompleted has no type.
The notificationHandler (i.e. Func1) is only called once per subscription. This makes sense as you are given an Observable<Throwable>, which can emit any number of errors.
The output Observable has to use the input Observable as its source. You must react to the Observable<Throwable> and emit based on it; you can’t just return a generic stream.
The Observable input only triggers on terminal events (onCompleted for repeatWhen / onError for retryWhen). It doesn’t receive any of the onNext notifications from the source, so you can’t examine the emitted data to determine if you should resubscribe. If you want to do that, you have to add an operator like takeUntil() to cut off the stream.

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