ZEO ClientDisconnected - on a disconnected transaction

Plone Support Deployment & hosting
1

Hi,
since our upgrade to Plone 5.1.2.1, we have some problems with some longer transactions (ex. Sync from PostgreSQL). This is the Traceback:

Its only on ZEO Setup - localhost Zope is working fine

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 420, in _commitResources
  Module ZODB.Connection, line 498, in commit
  Module ZODB.Connection, line 547, in _commit
  Module ZODB.Connection, line 603, in _store_objects
  Module ZODB.mvccadapter, line 165, in store
  Module ZEO.ClientStorage, line 566, in store
  Module ZEO.ClientStorage, line 487, in _check_trans
ClientDisconnected: ('store', 'on a disconnected transaction')

or another one

Traceback (most recent call last):
  File "/var/www/plone/p51/eggs/ZEO-5.1.1-py2.7.egg/ZEO/asyncio/server.py", line 102, in message_received
    result = getattr(self.zeo_storage, name)(*args)
  File "/var/www/plone/p51/eggs/ZEO-5.1.1-py2.7.egg/ZEO/StorageServer.py", line 460, in storeBlobStart
    assert self.blob_tempfile is None
AssertionError

Can anybody explain it to me - and give me an hint how I can solve/deal with it?

Products.CMFPlone-5.1.2.1
ZODB3-3.11.0
ZEO-5.1.1
ZODB-5.3.0

2

I see the same error when generating previews.
I wonder whether this runs into the ZEO transaction timeout.

3

Same is happening to us since we moved to Plone 5.1 and the ZODB 5.x stack that comes with it.

So far I got no clue on how to fix it :no_mouth:

4

My "temporary" fix was (and is): Connect to Plone via port (http://234.234.234.234:8080) - than it works, also in ZEO setup.
(Or increasing ZEO-Server "transaction-timeout")

But its nothing I am happy with....

5

This is also happening to me when trying to copy/paste folders that have multiple objects or when batch creating objects. After adding a couple of transaction commits to cut down on transaction sizes it seems to be working.

Products.CMFPlone-5.1.x
ZODB3-3.11.0
ZEO-5.1.1
ZODB-5.3.0

Edit:
I tried upgrading the following packages but it didn't change anything. The error also happened when I tried copy pasting 30 objects. Here are my new pinnings.

ZEO = 5.2.1
ZODB = 5.5.1
zodbpickle = 1.0.3
transaction = 2.4.0
persistent = 4.4.0

6

We are also facing this with Plone 5.1.5, but instead of 'store' our error is in 'tpc_vote':

ClientDisconnected: ('tpc_vote', 'on a disconnected transaction')

We are seeing this just in ZEO clients that are not on the same server as the ZEO server.

7

We have rechecked this, and it looks like it is something related to haproxy timeouts.

This was our previous configuration in haproxy:

server instance2 x.x.x.x:8080 cookie p0102 check maxconn 2 rise 1

After changing it to this, the errors are gone:

server instance0 10.x.x.x:4180 cookie p0100 weight 1 check inter 15s maxconn 2 rise 2 fall 1

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