[ZODB-Dev] Wrong blob returned in one of the zeo clients

[Maurits van Rees]

Hi,

I saw something strange today.  I have two zeo clients using the same 
database.  Both clients are on their own machine, and the database is 
also on a different one.  When looking at an image, one client showed a 
completely different image than the other.

This is with RelStorage 1.5.0b2 (postgres), ZODB3 3.8.6-polling, Plone 
3.3.5, with plone.app.blob 1.3.  The blobs are stored in RelStorage and 
the two zeo clients have their own blob cache with shared-blob-dir set 
to false.  This site has recently been migrated from file storage to 
relstorage and I have now migrated the images to blobs (using the 
migration from plone.app.blob).  This this a test setup btw, so not yet 
live.

When I emptied the blob cache of the client that showed the wrong 
picture, it got the correct picture from the database.  Actually, I saw 
that the second client had only this single picture in its blob cache so 
I removed just this single picture from the blob cache of the first zeo 
client (that had the wrong one).

Has anyone seen this behaviour before?

Hm, I now see that the modification time of the wrong blob file as shown 
by the operating system is a time that is about halfway through the blob 
migration.  That might be an explanation, actually.

Other ideas?

Cheers,

-- 
Maurits van Rees
Web App Programmer at Zest Software: http://zestsoftware.nl
Personal website: http://maurits.vanrees.org/