IRC log of #zope3-dev for Thursday, 2011-01-06

« Wednesday, 2011-01-05 Index Friday, 2011-01-07 »
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bbot_ztk10devbuild #128 of Python2.4.6 Linux 64bit started, including []04:00
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bbot_kgs341build #128 of Python2.4.6 64bit linux started, including []07:00
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mgedminhi, J1m15:53
mgedminmy MVCC question yesterday was about this: if a piece of code opens a connection, never closes it, never calls sync(), and runs forever -- will it receive and process MVCC invalidations, or will it see old cached object versions all the time?15:54
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J1mmgedmin, it will see only object as they were at the start of the transaction.16:20
J1mSo it may load data from the server (as opposed to cache) but that data will not reflect changes since the start of the transaction.16:20
mgedminand if I do a transaction.abort() and therefore begin a new transaction?16:34
J1mIs there a question there?16:37
J1mI can't answer the seeming question without repeating myself.16:37
mgedminsorry16:42
mgedminis transaction.abort() sufficient for a connection to update its internal cache when objects are changed from a different thread?16:43
mgedminor is connection.sync() also necessary?16:43
* mgedmin is trying to debug a weird problem with RAMSessionDataContainer, which never calls connection.sync()16:44
J1mconnection sync just calls abort on it's transaction manager.16:44
J1mIt also calls sync on the storage, but I know of no storages for which that isn't a noop.16:45
mgedminit also calls self._flush_invalidations()16:45
J1mTrue.16:46
J1mI'm 98% sure that aborting is enough.16:46
mgedminhm16:46
mgedminthen my conclusion was wrong16:46
mgedminand I don't know what caused the strange conflict error I saw16:46
J1mThere's always that 2% :)16:47
mgedminhttps://mail.zope.org/pipermail/zope-dev/2011-January/042280.html16:47
mgedmin"serial this txn started with" doesn't change in those warnings16:47
mgedminwhich is why I thought RAMSessionDataContainer is using ZODB connections in a way that makes those not notice objects changed by other threads16:48
J1mThe connection should flush invalidations at transaction boundaries.16:50
J1mIt pretty much has to.16:51
mgedminthere are only two places that call self._flush_invalidations(): Connection.sync() and Connection.open()16:51
mgedminin ZODB 3.9.716:51
mgedminsorry, _storage_sync()16:52
mgedminah, there's also afterCompletion = _storage_sync and newTransaction = _storage_sync16:52
mgedminwhich should be called on transaction boundaries, right?16:52
mgedminok, this proves I was wrong16:53
J1mright16:55
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