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4.x

Information

Status: Open.

Feature

#7971 In ReactiveX/RxJava;

· akarnokd opened on Mar 16, 2026

Update wiki to reflect 4.x (tracking issue)

4.x

Discussion

Documentation

PR welcome

Status: Open.

Task

#6132 In ReactiveX/RxJava;

· akarnokd opened on Aug 3, 2018

4.x: Flowable missing or incorrect marbles (tracking issue)

4.x

Documentation

PR welcome

Status: Open.

Task

#5813 In ReactiveX/RxJava;

· akarnokd opened on Jan 17, 2018

3.x: recursive concat causes StackOverflowError

4.x

Investigating

Status: Open.

Bug

#6958 In ReactiveX/RxJava;

· akarnokd opened on Apr 11, 2020

GroupBy using only one group after some time

4.x

Investigating

Shortcoming

Status: Open.

Bug

#7544 In ReactiveX/RxJava;

· PiotrDuz opened on Mar 21, 2023

4.x: Separate TestHelper.race uses so they can run @Isolated

4.x

PR welcome

Test

Test-Failures

Status: Open.

Task

#8075 In ReactiveX/RxJava;

· akarnokd opened on Mar 25, 2026

Flowable#groupBy race leads to a back-pressure issue

4.x

Question

Shortcoming

Status: Open.

Bug

#7100 In ReactiveX/RxJava;

· bsideup opened on Oct 20, 2020

3.x: parallel performs poorly with 10+ parallelism

4.x

Performance

Status: Open.

Feature

#6931 In ReactiveX/RxJava;

· akarnokd opened on Mar 11, 2020

Feature Request: Add Observable.usingWhen() for resources generated by a Publisher

4.x

Feature-Request

Status: Open.

Feature

#7548 In ReactiveX/RxJava;

· KarboniteKream opened on Mar 25, 2023

4.x: Java target version clarification

4.x

Discussion

Status: Open.

Task

#8089 In ReactiveX/RxJava;

· akarnokd opened on Mar 30, 2026