External link access in parallel HDF5 1.12.0


I have recently noticed that parallel HDF5 code that accesses datasets via external links and previously worked in HDF5 1.10.x is suddenly unable to locate the files which are referenced by the external links when compiled with HDF5 1.12.0. The same code works fine in serial mode, i.e. when H5set_fapl_mpio is not used. I was wondering if this is a known issue and if there is a workaround. Thanks and best regards!

Hi Ivan,

Yes, it is a known issue and we have been working on it.


Can you try with the HDF5 develop branch? One issue was fixed with external links in parallel recently. This might fix your issue.

Ref. https://jira.hdfgroup.org/browse/HDFFV-11109