Is writting thread safe?

[mporracindie]

Hi, I would like to know if writing from different threads to the same open connection is safe? What happens if I keep calling write while it needs to flush?

[martindurant]

What exactly do you mean by open connection?

[mporracindie]

So if I do something like:

with s3.open('mybucket/new-file', 'wb') as f:

And then call f.write() from multiple threads at the same time at a high rate would it be able to handle it?

[martindurant]

I don't believe its ever been tested. Each upload of a block will happen in only one thread, but it is conceivable that the various attributes of the file instance have some race conditions.

[tumut]

It's not, files have been getting "chopped off" midway while I'm attempting to write many files at once.