I'm wondering if there has been any open source software project for
Hadoop that can work with *both* HDF4 and HDF5 directly as described
in SciMATE (i.e., HDF5 Adapter in Figure 2 from the paper) I think
 is close but it seems to be only for NetCDF.
p.s. I'm not looking for a solution that involves exporting data
into XML from HDF.
HDF: Software that Powers Science