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[FLINK-7328] [futures] Replace Flink's futures with Java 8's CompletableFuture in SlotManager #4443

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tillrohrmann
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What is the purpose of the change

Replace Flink's futures with Java 8's CompletableFuture in SlotManager.

This PR is based on #4438.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

  • Dependencies (does it add or upgrade a dependency): (no)
  • The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
  • The serializers: (no)
  • The runtime per-record code paths (performance sensitive): (no)
  • Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)

Documentation

  • Does this pull request introduce a new feature? (no)

…mpletableFuture conversion

Add DirectExecutionContext

Add Scala Future to Java 8 CompletableFuture utility to FutureUtils

Add Flink future to Java 8's CompletableFuture conversion utility to FutureUtils

Add base class for Flink's unchecked future exceptions
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@zentol zentol left a comment

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+1

@tillrohrmann
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Thanks for the review @zentol. Merging this PR.

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