[ZODB-Dev] Re: Database Corruption.

[Jim Fulton]

Tim Peters wrote:
> [Ramon Aseniero]
> 
>>2004-06-28T18:02:30 ERROR(200) ZODB Couldn't load state for
>>'\x00\x00\x00\x00\x00\x02y\x89' Traceback (innermost last):
>>  File /usr/lib/zope/lib/python/ZODB/Connection.py, line 551, in
> 
> setstate
> 
>>  File /usr/lib/zope/lib/python/ZODB/FileStorage.py, line 645, in load
>>    (Object: /village/zope/default/var/Data.fs)
>>  File /usr/lib/zope/lib/python/ZODB/FileStorage.py, line 623, in _load
>>    (Object: /village/zope/default/var/Data.fs)
>>error: unpack str size does not match format
> 
> 
> This is certainly peculiar.  The failing unpack is the last line here:
> 
>     def _load(self, oid, version, _index, file):
>         try:
>             pos = _index[oid]
>         except KeyError:
>             raise POSKeyError(oid)
>         file.seek(pos)
>         read = file.read
>         h = read(DATA_HDR_LEN)
>         doid, serial, prev, tloc, vlen, plen = unpack(DATA_HDR, h)
> 
> The only ways I see that we *could* get a "str size does not match format"
> error are:  (a) I/O on this box is plain broken; or, (b) the object is at
> the very end of a "truncated" .fs file, so that fewer than DATA_HDR_LEN
> bytes remain to be read.

or c) it's index is screwed up.  I wanted to see the files to
verify this.  Then the question would be, how did the index get
out of sync with the data.

Jim

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