On Mar 3, 2009, at 8:05 AM, Raphael Collet wrote:
On Mon, Mar 2, 2009 at 11:52 AM, Torsten Anders
<[email protected]> wrote:
On Mar 2, 2009, at 9:34 AM, Raphael Collet wrote:
If I am not mistaken, all the stateless entities that can be copied
across sites are pickled just like in Mozart 1.3.2. So I think
that the pickler in Mozart 1.4.0 is able to unpickle pickles made
with Mozart 1.3.2.
It appears this is not the case. Here is the error message which I
get when trying to load a pickle functor compiled with Mozart 1.3.*
into Mozart 1.4.0.
%***************** Error: distributed programming ***************
%**
%** Version mismatch during loading of pickle
%**
%** File: '/path/to/my/file'
%** Expected: '4#0'
%** Got: '3#3'
%** Pickle version 3#3 corresponds to Oz version: '1.3.0'
%** In statement: {<P/2 URL.load> '#'('/' [85 115 101 114 115]
'/' [116] '/' [111 122] '/' [109 117 115 105 99] '/' [83 116 114 97
115 104 101 101 108 97] ,,,) _}
%**
%** Call Stack:
%** procedure 'Meth_load' in file "/Users/bmejias/Mozart/mozart-1-4-
x/mozart/share/lib/init/Resolve.oz", line 61, column 3, PC = 5022388
%** procedure 'Do_Method' in file "/Users/bmejias/Mozart/mozart-1-4-
x/mozart/share/lib/init/Resolve.oz", line 87, column 3, PC = 5023784
%**--------------------------------------------------------------
We played it on the safe side, here. There is a test on the
version number of the pickle, and we force it to match the one of
the virtual machine. But in practice, the pickle format has not
changed that much. I think I only added new types of pickled
data. I believe that unpickling older pickles should be possible.
So, are you suggesting that loading older pickles into future newer
versions could be made possible simply by changing this safety test
to check that the loader pickle is older or equal the current version
(but not newer)?
Best
Torsten
Cheers,
raph
<ATT00001.txt>
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