Bump relstorage[postgresql] from 2.1.1 to 3.4.1

[dependabot-preview]

Bumps relstorage[postgresql] from 2.1.1 to 3.4.1.

Changelog

Sourced from relstorage[postgresql]'s changelog.

3.4.1 (2021-04-12)

• RelStorage has moved from Travis CI to GitHub Actions for macOS and Linux tests and manylinux wheel building. See 437.
• RelStorage is now tested with PostgreSQL 13.1. See 427.
• RelStorage is now tested with PyMySQL 1.0. See 434.
• Update the bundled boost C++ library from 1.71 to 1.75.
• Improve the way store connections are managed to make it less likely a "stale" store connection that hasn't actually been checked for liveness gets used.

3.4.0 (2020-10-19)

• Improve the logging of zodbconvert. The regular minute logging contains more information and takes blob sizes into account, and debug logging is more useful, logging about four times a minute. Some extraneous logging was bumped down to trace.

• Fix psycopg2 logging debug-level warnings from the PostgreSQL server on transaction commit about not actually being in a transaction. (Sadly this just squashes the warning, it doesn't eliminate the round trip that generates it.)

• Improve the performance of packing databases, especially history-free databases. See 275.

• Give zodbpack the ability to check for missing references in RelStorages with the --check-refs-only argument. This will perform a pre-pack with GC, and then report on any objects that would be kept and refer to an object that does not exist. This can be much faster than external scripts such as those provided by zc.zodbdgc, though it definitely only reports missing references one level deep.

  This is new functionality. Feedback, as always, is very welcome!

• Avoid extra pickling operations of transaction meta data extensions by using the new extension_bytes property introduced in ZODB 5.6. This results in higher-fidelity copies of storages, and may slightly improve the speed of the process too. See 424.

• Require ZODB 5.6, up from ZODB 5.5. See 424.

• Make zodbconvert much faster (around 5 times faster) when the destination is a history-free RelStorage and the source supports record_iternext() (like RelStorage and FileStorage do). This also applies to the copyTransactionsFrom method. This is disabled with the --incremental option, however. Be sure to read the updated zodbconvert documentation.

3.3.2 (2020-09-21)

• Fix an UnboundLocalError in case a store connection could not be opened. This error shadowed the original error opening the connection. See 421.

3.3.1 (2020-09-14)

• Manylinux wheels: Do not specify the C++ standard to use when compiling. This seemed to result in an incompatibility with manylinux1 systems that was not caught by auditwheel.

3.3.0 (2020-09-14)

• The "MySQLdb" driver didn't properly use server-side cursors when requested. This would result in unexpected increased memory usage for things like packing and storage iteration.

• Make RelStorage instances implement IStorageCurrentRecordIteration. This lets both history-preserving and history-free storages work with zodbupdate. See 389.

• RelStorage instances now pool their storage connection. Depending on the workload and ZODB configuration, this can result in requiring fewer storage connections. See 409 and 417.

  There is a potential semantic change: Under some circumstances, the loadBefore and loadSerial methods could be used to load states from the future (not visible to the storage's load connection) by using the store connection. This ability has been removed.

• Add support for Python 3.9.

• Drop support for Python 3.5.

• Build manylinux x86-64 and macOS wheels on Travis CI as part of the release process. These join the Windows wheels in being automatically uploaded to PyPI.

3.2.1 (2020-08-28)

• Improve the speed of loading large cache files by reducing the cost of cache validation.

... (truncated)

Commits

• 4bd8929 Preparing release 3.4.1
• 426be9f Tell zest.releaser not to create a wheel. CI does that.
• 5e6ef78 Merge pull request #452 from zodb/better_store_conn_cleanup
• 825c0aa Improve the way store connections are managed
• a8f517a Add implementation notes on readCurrent on PostgreSQL: it does disk IO. [skip...
• 9e7a638 Add in-process contended local_client benchmarks. [skip ci]
• bf567fc Tweak multiplier in testing locks on CI.
• 0051e3a Merge pull request #447 from zodb/boost_1_75
• 405febd Fix links in README.rst [skip ci]
• 998e3d5 Update bundled boost from 1.71 to 1.75.
• Additional commits viewable in compare view

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Superseded by #200.