Re: strange exception

My system raises below exception first in randomly one of the transaction

 File "C:\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\blob.py", 
line 931, in remove_committed
    os.remove(filename)
WindowsError: [Error 32] The process cannot access the file because it is 
being used by another process: u
'D:\\sites\\sites_7_0_scale\\batonSites\\CheckerServer\\var\\blobs\\124\\0x00cdvcft.tmp-'



After this in a couple of subsequent transactions ClientDisconnected Error 
is reported


  File 
"C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\ClientStorage.py", 
line 846, in loadBefore
    result = self._server.loadBefore(oid, tid)
  File 
"C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\ClientStorage.py", 
line 92, in __getattr__
    raise ClientDisconnected()
ClientDisconnected


After this error all transactions start throwing following error


2016-12-22T14:30:19 ERROR ZODB.Connection Couldn't load state for 
baton.baton.BatonSite 0x1b
Traceback (most recent call last):
  File 
"C:\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\Connection.py", 
line 899, in setstate
    self._setstate(obj, oid)
  File 
"C:\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\Connection.py", 
line 943, in _setstate
    p, serial = self._storage.load(oid, '')
  File 
"C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\ClientStorage.py", 
line 825, in load
    result = self.loadBefore(oid, m64)
  File 
"C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\ClientStorage.py", 
line 851, in loadBefore
    self._cache.store(oid, tid, end, data)
  File "C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\cache.py", 
line 139, in _locked_wrapper
    return func(inst, *args, **kwargs)
  File "C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\cache.py", 
line 647, in store
    self._store(oid, start_tid, end_tid, data, size)
  File "C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\cache.py", 
line 661, in _store
    nfreebytes = self._makeroom(size+1)
  File "C:\Python27\lib\site-packages\zeo-4.3.0-py2.7.egg\ZEO\cache.py", 
line 447, in _makeroom
    del current[oid]
  File 
"C:\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\fsIndex.py", line 
167, in __delitem__
    del tree[key[6:]]
KeyError: '_\t'



If I 

   - catch ClientDisconnectedError in transaction 
   - Close the connection and database. 
   - Reopen database and connection
   
then subsequent transactions work properly. Can it be an issue in 
connection cache etc ?



On Wednesday, 28 December 2016 11:55:27 UTC+5:30, Jim Fulton wrote:
>
>
>
> On Tue, Dec 27, 2016 at 10:01 PM, Sanjay Rao <[email protected] 
> <javascript:>> wrote:
>
>> No issues.
>> Sometimes just discussing problem with you guys gives a solution.
>>
>
> Glad to hear it.
>
> Handling ClientDisconnected exception and closing/reopening database 
>> server solved my problem.
>>
>
> Hm, that shouldn't have been necessary.  Clients reconnect after being 
> disconnected.
>
> Did you really restart the server?
>
> Do you know why the client got disconnected?
>
> Were there errors in the server log?
>
> I also don't see how a disconnected client could produce the errors you 
> reported.
>
> <shrug>
>
> Jim
>
> -- 
> Jim Fulton
> http://jimfulton.info
>

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