[ZODB-Dev] zeopack error

[Kaweh Kazemi]

Hi there,

Recap: last week I examined problems I had packing our 4GB users storage. With Martijn's help I was able to fix zeo's exception output and write out the first broken pickle that throws an exception. During my checks I realized that running the pack in a Python 2.7 environment (using the same ZODB version - 3.10.3) works fine, the pack reduces our 4GB storage to 1GB. But our production server uses Python 2.6 (same ZODB3.10.3) which yields the problem (though the test had been done on OS X 10.7.3 - 64bit, and the production server is Debian Squeeze 32bit).

Currently I see only three ways to resolve that problem:

	- Upgrade production server from Python 2.6 to Python 2.7 which would probably solve the current problem (if it's really a Python 2.6/2.7 problem).

	- Pack the storage with Python 2.7/ZODB3.10.3 on the working system and deploy it back to the Python 2.6 production environment - very time consuming (because I have to download/pack/upload a big storage and during that time the production server wouldn't be available to avoid changes during that time)/ potentially risky(?).

	- Find out what is broken regarding that pickle and possibly the Python 2.6/ZODB3.10.3 combination and deploy a fix.

You can download the broken pickle from here: http://www.reversepanda.com/download/brokenpickle

If someone has more experience in parsing and understanding pickles in regards to ZODB3, any help would be appreciated.

Kind regards,
Kaweh