AssertionError: Module ZODB.blob, line 435, in getPathForOID

[zopyx]

I am getting this error with ZODB 5.5.1 (Python 3) as part of a Plone migration.

Not sure if this is related to a low memory situation (14,2 GB out of 15,7 GB RAM used, 15 GB free on disk (blobstorage)

2020-05-12 09:37:45,454 ERROR   [Zope.SiteErrorLog:251][waitress] 1589269065.4233440.9204063557356513 http://localhost:20081/plone_portal/img/dbz/diversiteit-en-gender/ugentinzicht/POST_application_json_
Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
  Module transaction._manager, line 252, in commit
  Module transaction._manager, line 131, in commit
  Module transaction._transaction, line 311, in commit
  Module transaction._compat, line 50, in reraise
  Module transaction._transaction, line 302, in commit
  Module transaction._transaction, line 447, in _commitResources
  Module transaction._compat, line 50, in reraise
  Module transaction._transaction, line 421, in _commitResources
  Module ZODB.Connection, line 497, in commit
  Module ZODB.Connection, line 546, in _commit
  Module ZODB.Connection, line 595, in _store_objects
  Module ZODB.mvccadapter, line 170, in storeBlob
  Module ZEO.ClientStorage, line 586, in storeBlob
  Module ZODB.blob, line 435, in getPathForOID

https://github.com/zopefoundation/ZODB/blob/master/src/ZODB/blob.py#L429-L437

[mgedmin]

That is evil code, it ought to ignore errno.EEXISTS and re-raise on any other error. It should at least log about the exception it got!