How can I perform flatMap using multiple threads in Reactor?

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I have tried running a flatMap on a Flux range followed by subscribeOn and it seems all operations run on the same thread. Is this normal?

Flux.range(0, 1000000).log().flatMap{ it + 1 }.subscribeOn(Schedulers.parallel()).subscribe()

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

add a comment |

up vote
1
down vote

favorite

I have tried running a flatMap on a Flux range followed by subscribeOn and it seems all operations run on the same thread. Is this normal?

Flux.range(0, 1000000).log().flatMap{ it + 1 }.subscribeOn(Schedulers.parallel()).subscribe()

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

add a comment |

up vote
1
down vote

favorite

I have tried running a flatMap on a Flux range followed by subscribeOn and it seems all operations run on the same thread. Is this normal?

Flux.range(0, 1000000).log().flatMap{ it + 1 }.subscribeOn(Schedulers.parallel()).subscribe()

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

I have tried running a flatMap on a Flux range followed by subscribeOn and it seems all operations run on the same thread. Is this normal?

Flux.range(0, 1000000).log().flatMap{ it + 1 }.subscribeOn(Schedulers.parallel()).subscribe()

multithreading kotlin project-reactor

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

edited Nov 21 at 10:25

honk

4,740114149

edited Nov 21 at 10:25

honk

4,740114149

edited Nov 21 at 10:25

honk

4,740114149

asked Nov 21 at 10:04

Andrew

4851919

asked Nov 21 at 10:04

Andrew

4851919

asked Nov 21 at 10:04

Andrew

4851919

add a comment |

1 Answer
1

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oldest

votes

up vote
3
down vote

accepted

You can create a ParallelFlux as follows:

Flux.range(0, 100000).parallel(2).runOn(Schedulers.parallel()).log().map{ it + 1 }.subscribe()

                      ^^^^^^^^^^^  ^^^^^^use runOn ^^^^^^^^^^^

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

You can create a ParallelFlux as follows:

Flux.range(0, 100000).parallel(2).runOn(Schedulers.parallel()).log().map{ it + 1 }.subscribe()

                      ^^^^^^^^^^^  ^^^^^^use runOn ^^^^^^^^^^^

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

add a comment |

up vote
3
down vote

accepted

You can create a ParallelFlux as follows:

Flux.range(0, 100000).parallel(2).runOn(Schedulers.parallel()).log().map{ it + 1 }.subscribe()

                      ^^^^^^^^^^^  ^^^^^^use runOn ^^^^^^^^^^^

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

add a comment |

up vote
3
down vote

accepted

You can create a ParallelFlux as follows:

Flux.range(0, 100000).parallel(2).runOn(Schedulers.parallel()).log().map{ it + 1 }.subscribe()

                      ^^^^^^^^^^^  ^^^^^^use runOn ^^^^^^^^^^^

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

You can create a ParallelFlux as follows:

Flux.range(0, 100000).parallel(2).runOn(Schedulers.parallel()).log().map{ it + 1 }.subscribe()

                      ^^^^^^^^^^^  ^^^^^^use runOn ^^^^^^^^^^^

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

edited Nov 22 at 10:36

answered Nov 21 at 13:13

Rene

1,33115

answered Nov 21 at 13:13

Rene

1,33115

answered Nov 21 at 13:13

Rene

1,33115

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

add a comment |

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

So flatMap doesn't break your streams into sub-streams that are processed in parallel? This is how the method was documented and thought only subscribeOn is necessary.
– Andrew
Nov 21 at 14:21

flatmap will only parallelize if you create a new Observable(Flux, Mono) inside the block. In your example with it +1 the operator flatMap will not compile and you should use map. I just updated my answer. See stackoverflow.com/questions/43269275/…
– Rene
Nov 22 at 10:39

add a comment |

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