List<CompletableFuture<Void>> futures = new ArrayList<>();
    
    for (int i = 0; i < channelCount; i++) {
        final int chunkOffset = i * chunkSize;
        final int chunkLength = (i == channelCount - 1) ? 
            length - chunkOffset : chunkSize;
        final ChannelInfo channel = channels.get(i);
        
        CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {