Issue: Concurrent use of same dataset (already downloaded)

## Describe the bug
When launching several jobs at the same time loading the same dataset trigger some errors see (last comments).

## Steps to reproduce the bug
export HF_DATASETS_CACHE=/gpfswork/rech/toto/datasets
for MODEL in "bert-base-uncased" "roberta-base" "distilbert-base-cased"; do #  "bert-base-uncased" "bert-large-cased" "roberta-large" "albert-base-v1" "albert-large-v1"; do
  for TASK_NAME in "mrpc" "rte" 'imdb' "paws" "mnli"; do
    export OUTPUT_DIR=${MODEL}_${TASK_NAME}
    sbatch --job-name=${OUTPUT_DIR} \
      --gres=gpu:1 \
      --no-requeue \
      --cpus-per-task=10 \
      --hint=nomultithread \
      --time=1:00:00 \
      --output=jobinfo/${OUTPUT_DIR}_%j.out \
      --error=jobinfo/${OUTPUT_DIR}_%j.err \
      --qos=qos_gpu-t4 \
      --wrap="module purge; module load pytorch-gpu/py3/1.7.0 ; export HF_DATASETS_OFFLINE=1; export HF_DATASETS_CACHE=/gpfswork/rech/toto/datasets;  python compute_measures.py --seed=$SEED --saving_path=results --batch_size=$BATCH_SIZE --task_name=$TASK_NAME --model_name=/gpfswork/rech/toto/transformers_models/$MODEL"

  done
done



```python
# Sample code to reproduce the bug
        dataset_train = load_dataset('imdb', split='train', download_mode="reuse_cache_if_exists")
        dataset_train = dataset_train.map(lambda e: tokenizer(e['text'], truncation=True, padding='max_length'),
                                          batched=True).select(list(range(args.filter)))

        dataset_val = load_dataset('imdb', split='train', download_mode="reuse_cache_if_exists")
        dataset_val = dataset_val.map(lambda e: tokenizer(e['text'], truncation=True, padding='max_length'),
                                      batched=True).select(list(range(args.filter, args.filter + 5000)))

        dataset_test = load_dataset('imdb', split='test', download_mode="reuse_cache_if_exists")
        dataset_test = dataset_test.map(lambda e: tokenizer(e['text'], truncation=True, padding='max_length'),
                                        batched=True)
```

## Expected results
I believe I am doing something wrong with the objects. 

## Actual results
Traceback (most recent call last):
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 652, in _download_and_prepare
    self._prepare_split(split_generator, **prepare_split_kwargs)
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 983, in _prepare_split
    check_duplicates=True,
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/arrow_writer.py", line 192, in __init__
    self.stream = pa.OSFile(self._path, "wb")
  File "pyarrow/io.pxi", line 829, in pyarrow.lib.OSFile.__cinit__
  File "pyarrow/io.pxi", line 844, in pyarrow.lib.OSFile._open_writable
  File "pyarrow/error.pxi", line 122, in pyarrow.lib.pyarrow_internal_check_status
  File "pyarrow/error.pxi", line 97, in pyarrow.lib.check_status
FileNotFoundError: [Errno 2] Failed to open local file '/gpfswork/rech/tts/unm25jp/datasets/paws/labeled_final/1.1.0/09d8fae989bb569009a8f5b879ccf2924d3e5cd55bfe2e89e6dab1c0b50ecd34.incomplete/paws-test.arrow'. Detail: [errno 2] No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "compute_measures.py", line 181, in <module>
    train_loader, val_loader, test_loader = get_dataloader(args)
  File "/gpfsdswork/projects/rech/toto/intRAOcular/dataset_utils.py", line 69, in get_dataloader
    dataset_train = load_dataset('paws', "labeled_final", split='train', download_mode="reuse_cache_if_exists")
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/load.py", line 748, in load_dataset
    use_auth_token=use_auth_token,
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 575, in download_and_prepare
    dl_manager=dl_manager, verify_infos=verify_infos, **download_and_prepare_kwargs
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 658, in _download_and_prepare
    + str(e)
OSError: Cannot find data file.
Original error:
[Errno 2] Failed to open local file '/gpfswork/rech/toto/datasets/paws/labeled_final/1.1.0/09d8fae989bb569009a8f5b879ccf2924d3e5cd55bfe2e89e6dab1c0b50ecd34.incomplete/paws-test.arrow'. Detail: [errno 2] No such file or directory

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: datasets==1.8.0
- Platform: linux (jeanzay)
- Python version: pyarrow==2.0.0
- PyArrow version: 3.7.8


Comments:
Launching simultaneous job relying on the same datasets try some writing issue. I guess it is unexpected since I only need to load some already downloaded file.

If i have two jobs that use the same dataset. I got :


  File "compute_measures.py", line 181, in <module>
    train_loader, val_loader, test_loader = get_dataloader(args)
  File "/gpfsdswork/projects/rech/toto/intRAOcular/dataset_utils.py", line 69, in get_dataloader
    dataset_train = load_dataset('paws', "labeled_final", split='train', download_mode="reuse_cache_if_exists")
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/load.py", line 748, in load_dataset
    use_auth_token=use_auth_token,
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 582, in download_and_prepare
    self._save_info()
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/builder.py", line 690, in _save_info
    self.info.write_to_directory(self._cache_dir)
  File "/gpfslocalsup/pub/anaconda-py3/2020.02/envs/pytorch-gpu-1.7.0/lib/python3.7/site-packages/datasets/info.py", line 195, in write_to_directory
    with open(os.path.join(dataset_info_dir, config.LICENSE_FILENAME), "wb") as f:
FileNotFoundError: [Errno 2] No such file or directory: '/gpfswork/rech/toto/datasets/paws/labeled_final/1.1.0/09d8fae989bb569009a8f5b879ccf2924d3e5cd55bfe2e89e6dab1c0b50ecd34.incomplete/LICENSE'

You can probably have a solution much faster than me (first time I use the library). But I suspect some write function are used when loading the dataset from cache.

I have the same issue:
```
Traceback (most recent call last):
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/builder.py", line 652, in _download_and_prepare
    self._prepare_split(split_generator, **prepare_split_kwargs)
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/builder.py", line 1040, in _prepare_split
    with ArrowWriter(features=self.info.features, path=fpath) as writer:
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/arrow_writer.py", line 192, in __init__
    self.stream = pa.OSFile(self._path, "wb")
  File "pyarrow/io.pxi", line 829, in pyarrow.lib.OSFile.__cinit__
  File "pyarrow/io.pxi", line 844, in pyarrow.lib.OSFile._open_writable
  File "pyarrow/error.pxi", line 122, in pyarrow.lib.pyarrow_internal_check_status
  File "pyarrow/error.pxi", line 97, in pyarrow.lib.check_status
FileNotFoundError: [Errno 2] Failed to open local file '/dccstor/tslm-gen/.cache/csv/default-387f1f95c084d4df/0.0.0/2dc6629a9ff6b5697d82c25b73731dd440507a69cbce8b425db50b751e8fcfd0.incomplete/csv-validation.arrow'. Detail: [errno 2] No such file or directory
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/dccstor/tslm/elron/tslm-gen/train.py", line 510, in <module>
    main()
  File "/dccstor/tslm/elron/tslm-gen/train.py", line 246, in main
    datasets = prepare_dataset(dataset_args, logger)
  File "/dccstor/tslm/elron/tslm-gen/data.py", line 157, in prepare_dataset
    datasets = load_dataset(extension, data_files=data_files, split=dataset_split, cache_dir=dataset_args.dataset_cache_dir, na_filter=False, download_mode=dataset_args.dataset_generate_mode)
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/load.py", line 742, in load_dataset
    builder_instance.download_and_prepare(
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/builder.py", line 574, in download_and_prepare
    self._download_and_prepare(
  File "/dccstor/tslm/envs/anaconda3/envs/trf-a100/lib/python3.9/site-packages/datasets/builder.py", line 654, in _download_and_prepare
    raise OSError(
OSError: Cannot find data file. 
Original error:
[Errno 2] Failed to open local file '/dccstor/tslm-gen/.cache/csv/default-387f1f95c084d4df/0.0.0/2dc6629a9ff6b5697d82c25b73731dd440507a69cbce8b425db50b751e8fcfd0.incomplete/csv-validation.arrow'. Detail: [errno 2] No such file or directory
```