Hello,
I have a question about data in hdf5 files aside from the data proper.
Specifically, I have the following example:
>>> import tables
>>> import numpy
>>> # Define simple table
>>> table1 = numpy.array([[(0,0,0), (1,0,0)], [(0,1,0), (0,0,1)]], {'names':
>>> ('r','g','b'), 'formats': ('f4', 'f4', 'f4')})
>>> # Write table to a file
>>> h5file = tables.openFile("/tmp/file1.h5", "w")
>>> h5file.createTable("/", "table1", description = table1)
>>> h5file.close()
>>> # Write same table to another file
>>> h5file = tables.openFile("/tmp/file2.h5", "w")
>>> h5file.createTable("/", "table1", description = table1)
>>> h5file.close()
When I diff the two files, /tmp/file1.h5 and /tmp/file2.h5 they are different:
$ diff /tmp/file1.h5 /tmp/file2.h5
Binary files /tmp/file1.h5 and /tmp/file2.h5 differ
Presumably the file has some metadata (perhaps a timestamp?) that
results in the difference. Is there a way to prevent this? or some
configuration parameter to control it? I want to be able to use a hash
of the file to detect a change in the data, but this will not work if
the file changes independently of the data.
Matt
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