the deprecation warning is from the SQLAlchemy side and we need to remove it which will be for 1.4.
Also we've identified a bug in cx_Oracle in this area that's not fixed yet, a cx_Oracle 2pc transaction cannot be replaced by a non-2pc transaction on a single connection: https://github.com/oracle/python-cx_Oracle/issues/530 I would guess that your environment is not immediately impacted because you use 2pc in all cases. On Fri, Jan 29, 2021, at 8:27 AM, Thierry Florac wrote: > Hi Mike, > I'm effectively using cx-Oracle... but I didn't notice any deprecation > warning! Maybe it's because I'm still using release 8.0.1 (as I still need > Python 3.5 support)? > > If you need anyone to test for cx-Oracle features, just ask! > > > Anyway, I'm also using other "no-transactional" databases (like Elasticsearch > indexes), for which I effectively just use a basic datamanager to post data, > without any need for synchronized transactions... > > Best regards, > Thierry > -- > https://www.ulthar.net -- http://pyams.readthedocs.io > > > Le mer. 27 janv. 2021 à 20:40, Mike Bayer <mike...@zzzcomputing.com> a écrit : >> __ >> >> >> On Wed, Jan 27, 2021, at 2:23 PM, Thierry Florac wrote: >>> Hi, >>> I'm actually using two databases connections: one is my "main" connection, >>> opened on a ZODB (with RelStorage), and **sometimes** I have to open >>> another connection on another database (and event more sometimes); the two >>> transactions have to be synchronized: if one of them is aborted for any >>> reason, the two transactions have to be aborted. >> >> >> OK, then two phase it is >> >>> I have always thought that the two-phase transaction was created to handle >>> this kind of use case, but if there is another better solution, I would be >>> very happy to know about it! >> >> if you need the ORM to call prepare() then you need the XID and there you >> are. >> >> This is all stuff that I think outside of the Zope community (but still in >> Python) you don't really see much of. If someone's Flask app is writing to >> Postgresql and MongoDB they're just going to spew data out to mongo and not >> really worry about it, but that's becasue mongo doesn't have any 2pc >> support. It's just not that commonly used because we get basically nobody >> asking about it. >> >> >>> >>> @jonathan, I made a patch to Pyramid DebugToolbar that I pushed to Github >>> and made a pull request. But I don't know how to provide a test case as a >>> two-phase commit is not supported by SQLite... >>> I'll try anyway to provide a description of a "method" I use to reproduce >>> this! >> >> So interesting fact, it looks like you are using Oracle for 2pc, that's what >> that tuple is, and we currently aren't including Oracle 2pc in our test >> support as cx_Oracle no longer includes the "twophase" flag which I think we >> needed for some of our more elaborate tests. At the moment, create_xid() >> emits a deprecation warning. I've been in contact with Oracle devs and it >> looks like we should be supporting 2pc as I can get help from them now for >> things that aren't working. I've opened >> https://github.com/sqlalchemy/sqlalchemy/issues/5884 to look into this. >> you should have been seeing a deprecation warning in your logs all this time >> though. >> >> >> >> >>> >>> Best regards, >>> Thierry >>> -- >>> https://www.ulthar.net -- http://pyams.readthedocs.io >>> >>> >>> Le mer. 27 janv. 2021 à 19:19, Mike Bayer <mike...@zzzcomputing.com> a >>> écrit : >>>> __ >>>> >>>> >>>> On Wed, Jan 27, 2021, at 8:32 AM, Thierry Florac wrote: >>>>> >>>>> Hi, >>>>> I'm actually using SQLAlchemy with Pyramid and zope.sqlalchemy packages. >>>>> My main database connection is a ZODB connection and, when required, I >>>>> create an SQLAlchemy session which is joined to main transaction using >>>>> this kind of code: >>>>> >>>>> * from *sqlalchemy.orm *import *scoped_session, sessionmaker >>>>> >>>>> * from *zope.sqlalchemy *import *register >>>>> * from *zope.sqlalchemy.datamanager *import* join_transaction >>>>> >>>>> _engine = get_engine(*engine*, *use_pool*) >>>>> if *use_zope_extension*: >>>>> factory = scoped_session(sessionmaker(*bind*=_engine, >>>>> *twophase*=*True*)) >>>>> else: >>>>> factory = sessionmaker(*bind*=_engine, *twophase*=*True*) >>>>> session = factory() >>>>> if *use_zope_extension*: >>>>> register(session, *initial_state*=*STATUS_ACTIVE*) >>>>> if *join*: >>>>> join_transaction(session, *initial_state*=*STATUS_ACTIVE*) >>>>> >>>>> Everything is working correctly! >>>>> >>>>> So my only question is that I also use Pyramid_debugtoolbar package, >>>>> which is tracking many SQLAlchemy events, including two-phase commits >>>>> transactions, and which in this context receives transaction IDs as a >>>>> three values tuple instead of a simple string (like, for example: (4660, >>>>> '12345678901234567890123456789012', '00000000000000000000000000000009'), >>>>> which is raising an exception)! >>>>> Is it normal behaviour, and what does this value mean? >>>> >>>> I would ask if you really really want to use the "twophase=True" flag, and >>>> I would suggest turning it off if you aren't in fact coordinating against >>>> multiple RDBMS backends (and even if you are, maybe). I'm not really >>>> sure what that tuple is, I'd have to look but it seems likely to be >>>> related to the XID stuff, which is really not something anyone uses these >>>> days. >>>> >>>> >>>>> >>>>> Best regards, >>>>> Thierry >>>>> >>>>> -- >>>>> https://www.ulthar.net -- http://pyams.readthedocs.io >>>>> >>>>> -- >>>>> SQLAlchemy - >>>>> The Python SQL Toolkit and Object Relational Mapper >>>>> >>>>> http://www.sqlalchemy.org/ >>>>> >>>>> To post example code, please provide an MCVE: Minimal, Complete, and >>>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>>>> description. >>>>> --- >>>>> You received this message because you are subscribed to the Google Groups >>>>> "sqlalchemy" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>> email to sqlalchemy+unsubscr...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/sqlalchemy/CAPX_VWCwQmHEsynbsSa54%2BvkWH5xkZC_-hh359iM%3D%2BYh1f%3DE6A%40mail.gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/sqlalchemy/CAPX_VWCwQmHEsynbsSa54%2BvkWH5xkZC_-hh359iM%3D%2BYh1f%3DE6A%40mail.gmail.com?utm_medium=email&utm_source=footer>. >>>> >>>> >>>> -- >>>> SQLAlchemy - >>>> The Python SQL Toolkit and Object Relational Mapper >>>> >>>> http://www.sqlalchemy.org/ >>>> >>>> To post example code, please provide an MCVE: Minimal, Complete, and >>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>>> description. >>>> --- >>>> You received this message because you are subscribed to the Google Groups >>>> "sqlalchemy" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to sqlalchemy+unsubscr...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/sqlalchemy/e5458f0a-4cf1-4328-93e5-4c827641c590%40www.fastmail.com >>>> >>>> <https://groups.google.com/d/msgid/sqlalchemy/e5458f0a-4cf1-4328-93e5-4c827641c590%40www.fastmail.com?utm_medium=email&utm_source=footer>. >>> >>> -- >>> SQLAlchemy - >>> The Python SQL Toolkit and Object Relational Mapper >>> >>> http://www.sqlalchemy.org/ >>> >>> To post example code, please provide an MCVE: Minimal, Complete, and >>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>> description. >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to sqlalchemy+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sqlalchemy/CAPX_VWBZ8B%3DqVd6J7_pg3yyZdvAcDfOjA86Pfn0XMpXKRu%2BT_A%40mail.gmail.com >>> >>> <https://groups.google.com/d/msgid/sqlalchemy/CAPX_VWBZ8B%3DqVd6J7_pg3yyZdvAcDfOjA86Pfn0XMpXKRu%2BT_A%40mail.gmail.com?utm_medium=email&utm_source=footer>. >> >> >> -- >> SQLAlchemy - >> The Python SQL Toolkit and Object Relational Mapper >> >> http://www.sqlalchemy.org/ >> >> To post example code, please provide an MCVE: Minimal, Complete, and >> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >> description. >> --- >> You received this message because you are subscribed to the Google Groups >> "sqlalchemy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sqlalchemy+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sqlalchemy/fc51abcd-a39e-4f52-84a6-2d8d07827b84%40www.fastmail.com >> >> <https://groups.google.com/d/msgid/sqlalchemy/fc51abcd-a39e-4f52-84a6-2d8d07827b84%40www.fastmail.com?utm_medium=email&utm_source=footer>. > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. 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