ObservableSource.asFlow() blocks the singleThreadContext/Dispatchers.Main on android, if the default buffer is exceeded

[Motoaleks]

I found an issue, that the next block of code suddenly blocks Dispatcher. It happens only on scopes with single thread attached (like created with newSingleThreadContext("SingleThread#1") or Dispatchers.Main on android). I understand, that the default buffer is 64 items and it should suspend sending and resume collecting if no back-pressure operator is applied. But why is this does not happen in that case?
Seems that runBlocking under the hood of asFlow operator does not resume collect. Is there any way to preserve the context and handle this situation?

case 1: JVM, with newSingleThreadContext

code:

fun main() {
    val context = newSingleThreadContext("SingleThread#1")
    val scope = CoroutineScope(context)

    scope.launch {
        Observable.create<Int> {
            for (i in 0..1000) {
                println("${Thread.currentThread().name}-provide: $i")
                it.onNext(i)
            }
        }
            .asFlow()
            .collect { println("${Thread.currentThread().name}-collect $it") }

        println("finished")
    }

    readLine()
}

result:

SingleThread#1-provide: 0
SingleThread#1-provide: 1
...
SingleThread#1-provide: 64
SingleThread#1-provide: 65

deps:

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1-native-mt'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-rx3:1.6.1-native-mt'
implementation 'io.reactivex.rxjava3:rxjava:3.1.4'
implementation 'io.reactivex.rxjava3:rxkotlin:3.0.1'

case2: Android, with Dispatchers.Main

code:

val context = Dispatchers.Main
val scope = CoroutineScope(context)
... // same

deps:

implementation 'io.reactivex.rxjava3:rxkotlin:3.0.1'
implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.1"
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1"
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-rx3:1.6.1'

result is the same.

[dkhalanskyjb]

tl;dr: try Dispatchers.Main.immediate instead of Dispatchers.Main.

it.onNext is a blocking operation, not a suspend function. If there is no more space left in the buffer, the operation will hang until there is.

Most dispatchers, when asked to resume a coroutine, will not execute it immediately, but will schedule it. This is what happens here: no one is collecting anything, because the only thread in use is busy creating new elements and notifying the dispatcher that someone should process them.

Some dispatchers, like Dispatchers.Unconfined or Dispatchers.Main.immediate, when being notified that a coroutine should be resumed, instead of processing this notification in some elaborate manner, will just run the code in that coroutine until the next suspension point (in case of Dispatchers.Main.immediate, only if the thread in use is already the correct one).

On a separate note, it is incorrect to create newSingleThreadContext and not close it, as this will lead to threads leaking. You should employ the pattern newSingleThreadContext(...).use { context -> ... } instead.

[vganin]

it.onNext is a blocking operation, not a suspend function. If there is no more space left in the buffer, the operation will hang until there is.

Isn't this a common case of missing backpressure? RxJava commonly throws MissingBackpressureException on buffer overflow. Flow has its own instruments to deal with backpressure - suspending by default.

In this case it turns out that backpressure results in deadlock which is not common neither in RxJava nor in Flow hence unexpected for user. Maybe we can throw MissingBackpressureException in asFlow somehow to be more consistent with RxJava model?

[Motoaleks]

Oh, I see an issue, thank you. But this is completely unexpected for collect caller behaviour. In some cases (when the user forget to use immediate/unconfined dispatcher) it leads to dispatcher deadlock with no notification (crash, lint or log) in others it is fine. This makes operator not universal but flow dispatcher based. Also there is no word about this behaviour in method documentation.

It would be much more informative to have an exception like the default Flowable behaviour, or another way to prevent this situations. Even the word about this in method documentation will enhance this issue investigation.

[dkhalanskyjb]

@vganin this suggestion has some pros and cons.

• It's a breaking change (and we don't make these if we can help it), as Dispatchers.Main.immediate will not work here the way I suggested.

• … which may also be a good thing, because it doesn't work nicely in any case. If we use Dispatchers.Unconfined, we see that the collection only starts to happen after the buffer is filled, which may lead to surprising results in some cases, but, dangerously, will be surprising in other cases. Throwing immediately may help identify the problem.

  Sample output

  Test worker @coroutine#2-provide: 0
  Test worker @coroutine#2-provide: 1
  Test worker @coroutine#2-provide: 2
  Test worker @coroutine#2-provide: 3
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  Test worker @coroutine#1-collect 0
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  Test worker @coroutine#2-provide: 66
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  Test worker @coroutine#2-provide: 521
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  Test worker @coroutine#2-provide: 585
  Test worker @coroutine#1-collect 520
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  Test worker @coroutine#2-provide: 586
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  Test worker @coroutine#2-provide: 650
  Test worker @coroutine#1-collect 585
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  Test worker @coroutine#1-collect 629
  Test worker @coroutine#1-collect 630
  Test worker @coroutine#1-collect 631
  Test worker @coroutine#1-collect 632
  Test worker @coroutine#1-collect 633
  Test worker @coroutine#1-collect 634
  Test worker @coroutine#1-collect 635
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  Test worker @coroutine#1-collect 640
  Test worker @coroutine#1-collect 641
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  Test worker @coroutine#1-collect 646
  Test worker @coroutine#1-collect 647
  Test worker @coroutine#1-collect 648
  Test worker @coroutine#1-collect 649
  Test worker @coroutine#2-provide: 651
  Test worker @coroutine#2-provide: 652
  Test worker @coroutine#2-provide: 653
  Test worker @coroutine#2-provide: 654
  Test worker @coroutine#2-provide: 655
  Test worker @coroutine#2-provide: 656
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  Test worker @coroutine#2-provide: 660
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  Test worker @coroutine#2-provide: 666
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  Test worker @coroutine#2-provide: 680
  Test worker @coroutine#2-provide: 681
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  Test worker @coroutine#2-provide: 713
  Test worker @coroutine#2-provide: 714
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  Test worker @coroutine#1-collect 650
  Test worker @coroutine#1-collect 651
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  Test worker @coroutine#1-collect 680
  Test worker @coroutine#1-collect 681
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  Test worker @coroutine#1-collect 700
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  Test worker @coroutine#1-collect 708
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  Test worker @coroutine#1-collect 710
  Test worker @coroutine#1-collect 711
  Test worker @coroutine#1-collect 712
  Test worker @coroutine#1-collect 713
  Test worker @coroutine#1-collect 714
  Test worker @coroutine#2-provide: 716
  Test worker @coroutine#2-provide: 717
  Test worker @coroutine#2-provide: 718
  Test worker @coroutine#2-provide: 719
  Test worker @coroutine#2-provide: 720
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  Test worker @coroutine#2-provide: 727
  Test worker @coroutine#2-provide: 728
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  Test worker @coroutine#2-provide: 768
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  Test worker @coroutine#2-provide: 780
  Test worker @coroutine#1-collect 715
  Test worker @coroutine#1-collect 716
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  Test worker @coroutine#1-collect 729
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  Test worker @coroutine#1-collect 731
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  Test worker @coroutine#2-provide: 781
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  Test worker @coroutine#1-collect 780
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  Test worker @coroutine#2-provide: 846
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  Test worker @coroutine#1-collect 975
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  Test worker @coroutine#1-collect 1000
  finished
  

• It's unpleasant that asFlow().buffer(0, BufferOverflow.SUSPEND).collect { ... } is not the same as subscribe { ... }, even though they look the same semantically.

• It looks like an issue that will consistently happen in testing and won't reach production, given that it only surfaces in single-threaded, deterministic scenarios, so this is not a very huge deal.

• It's not clear how prevalent this issue is, if at all. This is the first I've heard of it, at least.

@Motoaleks not sure what a good place for mentioning this issue would be, since this knowledge is just about suspend functions and dispatchers in general and not flow-specific: https://kotlinlang.org/docs/coroutine-context-and-dispatchers.html#unconfined-vs-confined-dispatcher