Does using glob or _exists read a file and put in the s3fs cache?

[asant-leitha]

If I use first glob or _exists, does put the file in the cache for later usage or not?

[martindurant]

The file details (not the file itself) are generally stored after real listing operations on the remote. They might not be stored when requesting partial listings, and of course the cache itself is configurable.

You can turn on logging (e.g., fsspec.utils.setup_logging(logger_name="s3fs")), or check the contents of your filesystems .dircache attribute to get more specifics on what happens when.