[ZODB-Dev] ZEO invalidation message transaction-inbound or outbound

[Andreas Jung]

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Hi there,

a customer made the observation that that ZEO clients
became inconsistent after some time (large CMF-based application
running on Zope 2.12 afaik). Customer made some investigation and
noticed that the ZEO invalidations have been queued (in some cases for
hours)...so the overall state of the ZEO clients became inconsistent.
Aren't ZEO invalidation messages supposed to be transmitted within
the current transaction (and outbound as it seems to happen here).
Isn't a ZEO cluster to be completely consistent at any time?
This smeels like "eventually consistency" as we know it from noSQL
databases but I always that a ZEO cluster would be completely consistent!?

- -aj
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