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
>
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