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Percona ClusterSync for MongoDB 0.9.0 (2026-05-12)

Release highlights

Changelog

New features

Improvements

  • PCSM-176 Better finalize status if there are failed indexes

  • PCSM-245 Ignore Atlas related database starting with ` __mdb_internal`

  • PCSM-246 Support logging to files

Bugs

  • PCSM-224 - [Sharded] Test test_indexes.py::test_internal_modify_many_props fails for sharded setup

  • PCSM-249 - [Sharding] Data mismatch after movePrimary command

  • PCSM-303 Pipeline update with many $set fields causes top-level field order mismatch on target

  • PCSM-304 tests/test_collections.py::test_capped_preserves_insertion_order sporadically fails on CI

  • PCSM-305 PCSM - Target MongoDB crashes with 125MB BufBuilder limit error during massive array updates due to unbounded pipeline AST inflation

  • PCSM-314 Replication phase crashes when hitting an event against not existing items in an array.

Technical task

  • PCSM-286 Cross-version replication: 7.0 to 8.0 support

  • PCSM-289 Cross-version replication: 6.0 to 8.0 support

Last update: May 5, 2026
Created: May 5, 2026