4.0

Issues

• Update wiki to reflect 4.x (tracking issue)

  4.xDiscussionDocumentationPR welcome
  Task

  ReactiveX/RxJava#6132 · Filter by author akarnokd opened on Aug 3, 2018 · 4.0
  23

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

  4.xDocumentationPR welcome
  Task

  ReactiveX/RxJava#5813 · Filter by author akarnokd opened on Jan 17, 2018 · 4.0
  5

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

  4.xPR welcomeTestTest-Failures
  Task

  ReactiveX/RxJava#8075 · Filter by author akarnokd opened on Mar 25, 2026 · 4.0
  4

• 4.x: parallel performs poorly with 10+ parallelism

  4.xPerformance
  Feature

  ReactiveX/RxJava#6931 · Filter by author akarnokd opened on Mar 11, 2020 · 4.0
  3

  

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

  4.xFeature-Request
  Feature

  ReactiveX/RxJava#7548 · Filter by author KarboniteKream opened on Mar 25, 2023 · 4.0
  3

• 4.x: Java target version clarification

  4.xDiscussion
  Task

  ReactiveX/RxJava#8089 · Filter by author akarnokd opened on Mar 30, 2026 · 4.0

• 4.x: FlowableBufferTest > longTimeAction() FAILED

  4.xTest-Failures
  Task

  ReactiveX/RxJava#8280 · Filter by author akarnokd opened on Aug 10, 2026 · 4.0
  

• 4.x: Streamable operator checklist

  4.xAIEnhancementStreamable
  Task

  ReactiveX/RxJava#8299 · Filter by author akarnokd opened on Aug 27, 2026 · 4.0
  1