ValueError: new last tid (273190459948665446) must be greater than previous one (273190525494372881)

[Chris Thomas]

Issue with Plone 5.1, we discovered another issue that honestly doesn't make sense to me.

When someone views the History of an item on the site, the site will take a long time to load, then this error comes up.

ValueError: new last tid (273179025317514649) must be greater than previous one (273179029162332364)

Full Traceback is as follows.

Traceback (innermost last):
Module ZPublisher.Publish, line 146, in publish
Module Zope2.App.startup, line 303, in commit
Module transaction._manager, line 131, in commit
Module transaction._transaction, line 310, in commit
Module transaction._transaction, line 301, in commit
Module transaction._transaction, line 446, in _commitResources
Module transaction._transaction, line 428, in _commitResources
Module ZODB.Connection, line 710, in tpc_finish
Module ZODB.mvccadapter, line 181, in tpc_finish
Module ZEO.ClientStorage, line 877, in tpc_finish
Module ZEO.asyncio.client, line 786, in tpc_finish
Module ZEO.asyncio.client, line 743, in call
Module ZEO.asyncio.client, line 756, in wait_for_result
Module concurrent.futures._base, line 422, in result
Module concurrent.futures._base, line 381, in __get_result
ValueError: new last tid (273190459948665446) must be greater than previous one (273190525494372881)

---- zeo clients disconnect and client logs show the following error

ERROR ZEO.asyncio.client Registration or cache validation failed, ('Server behind client, %r < %r, %s', '\x03\xca\xf8\x04\x10SE"', '\x03\xca\xf8\x06\xaaP\x8c\xdd', Protocol(('127.0.0.1', 8100), '1', False))
Traceback (most recent call last):
  File "/data/plone/buildout-cache/eggs/ZEO-5.1.1-py2.7.egg/ZEO/asyncio/client.py", line 493, in verify
    server_tid, cache_tid, protocol)
AssertionError: ('Server behind client, %r < %r, %s', '\x03\xca\xf8\x04\x10SE"', '\x03\xca\xf8\x06\xaaP\x8c\xdd', Protocol(('127.0.0.1', 8100), '1', False))