求助 CompletableFuture 怎么取消其任务

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查询到 cancel 方法其原型为

    /* ------------- Control and status methods -------------- */

    /**
     * If not already completed, completes this CompletableFuture with
     * a {@link CancellationException}. Dependent CompletableFutures
     * that have not already completed will also complete
     * exceptionally, with a {@link CompletionException} caused by
     * this {@code CancellationException}.
     *
     * @param mayInterruptIfRunning this value has no effect in this
     * implementation because interrupts are not used to control
     * processing.
     *
     * @return {@code true} if this task is now cancelled
     */
    public boolean cancel(boolean mayInterruptIfRunning) {boolean cancelled = (result == null) &&
            internalComplete(new AltResult(new CancellationException()));
        postComplete();
        return cancelled || isCancelled();}

mayInterruptIfRunning 参数实际并没有被用到，取消操作实际是软取消，并不会直接从线程池中进行取消操作，
实际测试发现 cancel 确实有问题，没有按照想象中快速取消超时任务，最终会导致线程池阻塞，不知道该怎么办

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