Enable PIO to Add Attributes to Existing NetCDF Files #1234
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Add Ability to Write New Attributes to Existing NetCDF Files in PIO
Overview:
Currently, PIO in MPAS lacks the ability to add new attributes to existing NetCDF files. This limitation arises because when PIO attempts to write a new attribute, the file remains in data mode, which does not allow for the addition of attributes. Instead, attributes can only be added when the file is in define mode.
Unfortunately, the public APIs of both PIO and NetCDF do not provide a way to inquire about a file’s current mode. Switching to define mode each time a new attribute is needed is expensive, as transitioning between data and define modes introduces significant I/O costs.