Re: strange exception

On Wed, Dec 28, 2016 at 12:11 AM, Sanjay Rao <[email protected]>
wrote:

> 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-'
>
>
>
Please don't trim tracebacks.



>
> 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
>
>
I suspect that this is a result of the error above.


>
> 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 ?
>

I can't tell what you're doing.  What do you mean by "close connection and
database" and "reopen connection and database"?   Are you creating a client
storage in each thread?

I wonder if there's a problem with shared blob caches on windows.

I never touch windows myself. IDK if there are other ZODB users who use
Windows who could help you.

Jim



>
>
>
> 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]> 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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-- 
Jim Fulton
http://jimfulton.info

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