Laurence,
Thank you for your very quick reply. I did as you suggested and now the
ConflictError is now handled. And that is a most excellent thing because
now ConflictError is raised every time. So it still seems to be confused.
I am trying to figure out if I will be able to use ZEO in my application.
Now my program reads:
while True:
root[ "one" ] = time.asctime()
while True:
try:
print "Try to commit transaction"
transaction.commit()
print "root is", root
except POSException.ConflictError:
print "we have a conflict"
transaction.abort()
time.sleep(.2)
else:
break
time.sleep(10)
And the output is:
// the program is only running once here
Try to commit transaction
root is {'one': 'Thu Nov 26 11:37:53 2009'}
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:03 2009'}
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:13 2009'}
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:23 2009'}
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:33 2009'}
// after I start a second copy, the first copy always has a conflict ( the
second copy does not get this conflict error).
Try to commit transaction
we have a conflict
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:35 2009'}
Try to commit transaction
we have a conflict
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:46 2009'}
Try to commit transaction
we have a conflict
Try to commit transaction
root is {'one': 'Thu Nov 26 11:38:56 2009'}
Try to commit transaction
we have a conflict
thanks,
tom
Laurence Rowe wrote:
>
> You must be prepared to abort and retry the whole transaction:
>
> while True:
> while True:
> try:
> root[ "one" ] = time.asctime()
> transaction.commit()
> except POSException.ConflictError:
> transaction.abort()
> time.sleep(.2)
> else:
> break
>
> time.sleep(10)
>
>
> Laurence
>
> 2009/11/26 tsmiller <tsmil...@gnixterhouse.com>:
>>
>> ZODB Developers,
>>
>> Can you please tell me what I am doing wrong in my first simple attempt
>> to
>> make use of ZEO. My ZODB and ZEO are both the same version (3.6.0).
>>
>> First, I start my ZEO server and it looks like it starts properly:
>>
>> python2.4 /usr/lib/python2.4/site-packages/ZEO/runzeo.py -a
>> localhost:9100
>> -f /home/tom/zeo/test.fs
>>
>> ------
>> 2009-11-26T00:05:14 INFO ZEO.runzeo (8192) opening storage '1' using
>> FileStorage
>> ------
>> 2009-11-26T00:05:14 INFO ZEO.StorageServer (8192) StorageServer created
>> RW
>> with storages: 1:RW:/home/tom/zeo/test.fs
>> ------
>> 2009-11-26T00:05:14 INFO ZEO.zrpc (8192) listening on ('localhost', 9100)
>>
>>
>> Second, I start my client, twice. The purpose is to write to the same
>> test.fs file from both of them. The idea is to loop continuously,
>> writing
>> to test.fs from each program. If I only start the program once, it
>> writes
>> to test.fs fine. But the first time it tries to commit a transaction
>> after
>> starting a second copy of the program, it always gives an error.
>>
>> from ZEO import ClientStorage
>> from ZODB import DB
>> from ZODB import POSException
>> import transaction
>> import time
>>
>> addr = 'localhost', 9100
>> storage = ClientStorage.ClientStorage( addr )
>> db = DB(storage)
>> conn = db.open()
>> root = conn.root()
>> while True:
>> root[ "one" ] = time.asctime()
>> while True:
>> try:
>> transaction.commit()
>> except POSException.ConflictError:
>> time.sleep(.2)
>> else:
>> break
>>
>> time.sleep(10)
>>
>>
>> The traceback folows. The conflict error is not handled and I don't know
>> why. I am sure that I am missing something simple.
>>
>> we have a conflict
>> Traceback (most recent call last):
>> File "zeotest.py", line 17, in ?
>> transaction.commit()
>> File "/usr/lib/python2.4/site-packages/transaction/_manager.py", line
>> 96,
>> in commit
>> return self.get().commit(sub, deprecation_wng=False)
>> File "/usr/lib/python2.4/site-packages/transaction/_transaction.py",
>> line
>> 370, in commit
>> self._prior_operation_failed() # doesn't return
>> File "/usr/lib/python2.4/site-packages/transaction/_transaction.py",
>> line
>> 250, in _prior_operation_failed
>> raise TransactionFailedError("An operation previously failed, "
>> ZODB.POSException.TransactionFailedError: An operation previously failed,
>> with traceback:
>>
>> File "zeotest.py", line 17, in ?
>> transaction.commit()
>> File "/usr/lib/python2.4/site-packages/transaction/_manager.py", line
>> 96,
>> in commit
>> return self.get().commit(sub, deprecation_wng=False)
>> File "/usr/lib/python2.4/site-packages/transaction/_transaction.py",
>> line
>> 380, in commit
>> self._saveCommitishError() # This raises!
>> File "/usr/lib/python2.4/site-packages/transaction/_transaction.py",
>> line
>> 378, in commit
>> self._commitResources()
>> File "/usr/lib/python2.4/site-packages/transaction/_transaction.py",
>> line
>> 433, in _commitResources
>> rm.commit(self)
>> File "/usr/lib/python2.4/site-packages/ZODB/Connection.py", line 484, in
>> commit
>> self._commit(transaction)
>> File "/usr/lib/python2.4/site-packages/ZODB/Connection.py", line 518, in
>> _commit
>> raise ConflictError(object=obj)
>> ConflictError: database conflict error (oid 0x00, class
>> persistent.mapping.PersistentMapping)
>>
>>
>> thanks,
>>
>> tom
>>
>>
>> --
>> View this message in context:
>> http://old.nabble.com/newbie-ZEO-first-try.--ConflictError.-tp26532984p26532984.html
>> Sent from the Zope - ZODB-Dev mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> For more information about ZODB, see the ZODB Wiki:
>> http://www.zope.org/Wikis/ZODB/
>>
>> ZODB-Dev mailing list - zodb-...@zope.org
>> https://mail.zope.org/mailman/listinfo/zodb-dev
>>
> _______________________________________________
> For more information about ZODB, see the ZODB Wiki:
> http://www.zope.org/Wikis/ZODB/
>
> ZODB-Dev mailing list - ZODB-Dev@zope.org
> https://mail.zope.org/mailman/listinfo/zodb-dev
>
>
--
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Sent from the Zope - ZODB-Dev mailing list archive at Nabble.com.
_______________________________________________
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