memmaps while modifying metadata only

[martinschorb]

Hi,

I have the feeling that for some reason somewhere in make_bdv it reads the memmaps into numpy arrays even when not overwriting the data. I tried to dig inn it but could not spot where exactly it happens.

I can only clearly see that the h5 files are modified when I run it, even though I only select metadata as overwrite parameter.

[constantinpape]

It shouldn't touch the data when you set it to metadata, but maybe something is going wrong.
Do you have a minimal example to check this?

[martinschorb]

blame on me...

I think it happens somewhere before. Still investigating. It is a bit tricky since some numpy functionality works on memmaps while others just load the data (without warning obviously).