Instance thread is stuck

Hi everybody,
    on a server I have some Plone 4.3.8 ZEO instances (different sites
and buildouts, different products, different ZEO servers).

All of them have installed:
 - https://pypi.python.org/pypi/haufe.requestmonitoring
which logs a traceback when a thread is stuck.

I see that the thread is stuck at this point:

2016-03-18T09:16:07 WARNING RequestMonitor.DumpTrace Long running request
Request 3454 "/" running in thread 140173064488704 since 57453.428818s
Python call stack (innermost first)
  Module ZODB.Connection, line 500, in _flush_invalidations
  Module ZODB.Connection, line 831, in _storage_sync
  Module transaction._transaction, line 513, in <lambda>
  Module transaction.weakset, line 58, in map
  Module transaction._transaction, line 513, in abort
  Module transaction._manager, line 92, in abort
  Module App.ZApplication, line 83, in __del__
  Module ZODB.Connection, line 530, in _flush_invalidations
  Module ZODB.Connection, line 831, in _storage_sync
  Module transaction._transaction, line 344, in <lambda>
  Module transaction.weakset, line 58, in map
  Module transaction._transaction, line 344, in commit
  Module transaction._manager, line 89, in commit
  Module Zope2.App.startup, line 301, in commit
  Module ZPublisher.Publish, line 146, in publish
  Module ZPublisher.Publish, line 249, in publish_module_standard
  Module ZPublisher.Publish, line 455, in publish_module
  Module ZServer.PubCore.ZServerPublisher, line 31, in __init__


I am quite clueless on the reason why this is happening: if I move the
buildout to another server this is not happening.

I have tried to modify on one zeoserver the invalidation-queue-size
parameter (it is set to 1000, instead of the default 100) but it was
not effective (it was rather a desperate move....).

Do you have any suggestion?

Thanks in advance!
-- 
@ale_pisa - http://ale-rt.github.io - http://alepisa.blogspot.com -
https://it.linkedin.com/in/apisa

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