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Percona ClusterSync for MongoDB 0.8.1 (2026-05-07)

We announce the release of Percona ClusterSync for MongoDB (PCSM) 0.8.1. This patch focuses on stability improvements, addressing a critical bug that could abort change-stream replication under heavy update workloads. With this fix, replication is more resilient and migrations complete reliably even when the source produces large, complex update events.

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Changelog

Bugs

  • PCSM-305: Fixed an issue where change-stream replication could fail on the target when source updates combined a truncation of a large nested array with indexed writes inside that same array and sibling-field updates. PCSM now splits update operations that conflict with an array truncation into separate follow-up writes and sizes bulk batches by aggregate wire bytes, keeping every individual update and every bulk command safely below internal 125 MB BufBuilder buffer limit.
Last update: May 7, 2026
Created: May 7, 2026