* Tasks execute with the same happens-before order that the function calls to {@link #submit} and
 * {@link #submitAsync} that submitted those tasks had.
 *
 * <p>This class has limited support for cancellation and other "early completions":
 *
 * <ul>
 *   <li>While calls to {@code submit} and {@code submitAsync} return a {@code Future} that can be
 *       cancelled, cancellation never propagates to a task that has started to run -- neither to

   * one input completes with result X and another later with result Y, for Y to come before X in
   * the output future list. (Such races are impossible to solve without global synchronization of
   * all future completions. And they should have little practical impact.)
   *
   * <p>Cancelling a delegate future propagates to input futures once all the delegates complete,

- API validation relaxed allowing Indexed Jobs to be scaled up/down by changing parallelism and completions in tandem, such that parallelism == completions. ([#115236](https://github.com/kubernetes/kubernetes/pull/115236), [@danielvegamyhre](https://github.com/danielvegamyhre)) [SIG Apps and Testing]

  when the number of succeeded Job Pods (`.status.succeeded`) reached the desired completions (`.spec.completions`). ([#126067](https://github.com/kubernetes/kubernetes/pull/126067), [@tenzen-y](https://github.com/tenzen-y)) [SIG API Machinery, Apps and Testing]

- Fixed validation for Job with `suspend=true`, and `completions=0` to set the Complete condition. ([#132614](https://github.com/kubernetes/kubernetes/pull/132614), [@mimowo](https://github.com/mimowo)) [SIG Apps and Testing]

                  : t;
          releaseShared(finalState);
        } else if (getState() == COMPLETING) {
          // If some other thread is currently completing the future, block until
          // they are done so we can guarantee completion.
          acquireShared(-1);
        }
        return doCompletion;
      }
    }

- Kubectl now supports shell completion for the <type>/<name> format for specifying resources.
  kubectl now provides shell completion for container names following the `--container/-c` flag of the `exec` command.

- Support for Indexed Job: a Job that is considered completed when Pods associated to indexes from 0 to (.spec.completions-1) have succeeded. ([#98812](https://github.com/kubernetes/kubernetes/pull/98812), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps and CLI]

import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionException;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * A {@link Future} that accepts completion listeners. Each listener has an associated executor, and
 * it is invoked using this executor once the future's computation is {@linkplain Future#isDone()

- Shell completion now shows plugin names when appropriate. Furthermore, shell completion will work for plugins that provide such support. ([#105867](https://github.com/kubernetes/kubernetes/pull/105867), [@marckhouzam](https://github.com/marckhouzam))