Release Notes for mongosync 1.1

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Filtered Sync

Unlike Topologies
Minimum Supported Server Version

Warning

Past Release Limitations

The Critical Advisories below affect some prior mongosync versions. Upgrade to the latest available patch release.

Issue	Affected Versions
`mongosync` could miss copying documents during long running reads in the initial copying phase if the source cluster is sharded and the source balancer is enabled.	1.1.0 - 1.7.1

Version 1.1 Released January 13, 2023

Filtered Sync

Cluster-to-Cluster Sync provides continuous data synchronization or a one-time data migration between two MongoDB clusters. You can use filtered sync to specify which databases and collections the mongosync utility transfers between the source and destination clusters.

For more information, see: Filtered Sync.

Unlike Topologies

Cluster-to-Cluster Sync 1.1 supports sync between clusters with different sharding configurations.

You can sync:

Between two sharded clusters
Between two sharded clusters with a different number of shards in each cluster
From a replica set to a sharded cluster

You cannot sync from a sharded cluster to a replica set.

For more information, see: Sharding Parameters.

Minimum Supported Server Version

Cluster-to-Cluster Sync requires at least MongoDB server version 6.0.4 on both the source and target clusters.

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