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Percona ClusterSync for MongoDB 1.1.0 has been released

Percona ClusterSync for MongoDB (PCSM) 1.1.0 has been released on November 9, 2026.

This release adds two controls for migrations:

  • Choose the write concern for target data writes. The default remains majority. Lower values can reduce write stalls, but acknowledged data writes can roll back after a target primary failover.
  • Skip chunk pre-splitting during the initial clone. Target collections retain the source shard key and MongoDB's initial chunk layout. Pre-splitting remains enabled by default.

PCSM 1.1.0 also improves clone failure reporting, pause handling, checkpoint recovery, and high availability.

Get started with the Quickstart guide.

See the 1.1.0 release notes for upgrade guidance, configuration details, and recovery considerations.