1. 06 Jun, 2019 10 commits
  2. 05 Jun, 2019 5 commits
  3. 03 Jun, 2019 2 commits
  4. 23 May, 2019 4 commits
    • Kirill Smelkov's avatar
      bigfile/zodb: Resync _ZBigFileH to Connection.transaction_manager on every connection reopen · 3608d493
      Kirill Smelkov authored
      This continues c7c01ce4 (bigfile/zodb: ZODB.Connection can migrate
      between threads on close/open and we have to care): Until now we were
      retrieving zconn.transaction_manager on _ZBigFileH init, and further using
      that transaction manager for every connection reopen. However that is
      not correct because on every reopen connection can be given new
      transaction manager.
      
      We were not practically hitting the bug because until recently ZODB was,
      by default, using the same ThreadTransactionManager manager instance as
      Connection.transaction_manager for all connections, and not doing all
      steps needed to keep _ZBigFileH.transaction_manager in sync to
      Connection was forgiven - a particular transaction manager that was used
      was TransactionManager instance implicitly associated with current
      thread by global threading.Local transaction.manager . However starting
      from ZODB 5.5.0 Connection code was changed to remember as
      .transaction_manager the particular TransactionManager instance without
      any threading.Local games:
      
          https://github.com/zopefoundation/ZODB/commit/b6ac40f153
          https://github.com/zopefoundation/ZODB/issues/208
          https://github.com/zopefoundation/ZODB/pull/226
      
      Given that we were not syncing properly that broke wendelin.core tests, for
      example:
      
          bigfile/tests/test_filezodb.py::test_bigfile_filezodb_vs_conn_migration Exception in thread Thread-1:
          Traceback (most recent call last):
            File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
              self.run()
            File "/usr/lib/python2.7/threading.py", line 754, in run
              self.__target(*self.__args, **self.__kwargs)
            File "/home/kirr/src/wendelin/wendelin.core/bigfile/tests/test_filezodb.py", line 401, in T11
              transaction.commit()    # should be nothing
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/transaction/_manager.py", line 252, in commit
              return self.manager.commit()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/transaction/_manager.py", line 131, in commit
              return self.get().commit()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/transaction/_transaction.py", line 298, in commit
              self._synchronizers.map(lambda s: s.beforeCompletion(self))
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/transaction/weakset.py", line 61, in map
              f(elt)
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/transaction/_transaction.py", line 298, in <lambda>
              self._synchronizers.map(lambda s: s.beforeCompletion(self))
            File "/home/kirr/src/wendelin/wendelin.core/bigfile/file_zodb.py", line 671, in beforeCompletion
              assert txn is zconn.transaction_manager.get()
          AssertionError
      
      What is happening here is that one thread used the connection and
      ZBigFile/_ZBigFileH associated with it, then the connection was closed
      and released to DB pool. Then the connection was reopened but by another
      thread and thus with different TransactionManager instance and oops -
      _ZBigFileH.transaction_manager is different because it is
      TransactionManager instance that was used by the first thread.
      
      Fix it by resyncing _ZBigFileH.transaction_manager on every
      connection reopen. No new test as existing tests already cover the
      problem when run with ZODB >= 5.5.0 .
      3608d493
    • Kirill Smelkov's avatar
      . · 9c39d87d
      Kirill Smelkov authored
      9c39d87d
    • Kirill Smelkov's avatar
      . · b0c36db3
      Kirill Smelkov authored
      b0c36db3
    • Kirill Smelkov's avatar
      . · 96a804b6
      Kirill Smelkov authored
      96a804b6
  5. 21 May, 2019 4 commits
  6. 19 May, 2019 2 commits
  7. 17 May, 2019 1 commit
  8. 16 May, 2019 1 commit
  9. 10 May, 2019 11 commits