I am experimenting with ZEO. Sometimes I get this Error:

ValueError: already have current data for oid (Also, the following
error occurred while attempting to render the standard error message,
please see the event log for full details: already have current data for

It starts with one URL in one ZEO-Client and after some time the whole
ZEO-System gets "infected". A restart of the ZEO components is needed to
make everything work properly again then.

In addition to that sometimes it seems that not every change in ZODB
gets anticipated by every ZEO-Client. Some Clients insist on delivering
"Ressource not found" while some others find these new objects.

The whole thing is complete unpredictable and seems not to follow any

Our system:

Apache - Pound - 5x ZEO-Client - ZEO-Server

Zope 2.8.5

The Server has 2 CPUs. I am experimenting on this machine alone in the
moment. So the load should be on a minimum at all.

What could be the reason for this here?


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