Release Notes for mongosync 1.2

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 1.2 Released February 16, 2023

Migrating Older Versions of MongoDB

Starting in version 1.2, mongosync can sync between MongoDB clusters (source or destination) with versions lower than 6.0 for one time migration onto Atlas. This feature requires additional preparation and configuration in clusters with versions lower than 6.0.

If you would like to use mongosync to migrate clusters with versions of MongoDB lower than 6.0, please contact your account team to inquire about Professional Services.

Guardrails for Unsupported Versions of MongoDB

mongosync now returns an error if you call start to sync clusters running unsupported releases of MongoDB Server.

Collated Collections Issue

Fixes bug that could cause mongosync to crash when replicating collated collections.

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1.3

1.1