GFile does not create file when nothing is written.

[odashi]

System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): yes
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): MacOS Catalina
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device: NA
• TensorFlow installed from (source or binary): binary (pip3)
• TensorFlow version (use command below): v2.3.0-54-gfcc4b966f1 2.3.1
• Python version: 3.8.2
• Bazel version (if compiling from source): NA
• GCC/Compiler version (if compiling from source): NA
• CUDA/cuDNN version: NA
• GPU model and memory: NA

Describe the current behavior

tf.io.gfile.GFile does nothing to the filesystem when it is closed without any write operations:

with tf.io.gfile.GFile('foo', 'wb') as fp:
  fp.write('test')  # 'foo' is created.

with tf.io.gfile.GFile('bar', 'wb'):
  pass  # 'bar' is not created.

Describe the expected behavior

The same behavior with builtin open: creates a file even if no write operation is invoked.

Standalone code to reproduce the issue
Already described above.

Other info / logs
NA

[ravikyram]

I have tried in colab with TF 2.3, nightly version( 2.5.0-dev20201125) and was able to reproduce the issue.Please, find the gist here. Thanks!

[rmothukuru]

@odashi,
As per the Test Code, it works if we add fp2.write('') instead of pass.

Please find the Gist.

[odashi]

@rmothukuru
Thanks for pointing it out. Calling FGile.write() with an empty string seems to do something to the inner filesystem explicitly by a user. It is still not a desired solution to me -- matching the behavior with open.

[saikumarchalla]

Still an issue in latest tf-nightly 2.10.0.dev2022072808.Please find the gist here.Thank you!