Release Notes for mongosync 1.13

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This page describes changes and new features introduced in MongoDB Cluster-to-Cluster Sync 1.13.

1.13.0 Release

March 25, 2025

mongosync no longer requires you to fully disable the source cluster's balancer for migrations started with namespace filtering. Now, you only have to disable the balancer for collections within the namespace filter.
You can leave the balancer enabled for collections outside the filter. The destination balancer still must be fully disabled for the duration of the migration.
Note
You don't need to disable the source balancer on individual collections. You can still disable the source balancer globally.

mongosync builds are now available for the following platforms:

Live upgrades from version 1.12 to 1.13 are supported.

Fixed Issues:

Fixed a bug introduced in v1.0.0 where mongosync could exit gracefully (instead of crashing with a fatal level log) on some errors.
Fixed a bug introduced in v1.11.0 where mongosync returned a confusing error when the user lacked sufficient permissions to enable destination-only write blocking by default.

For information on minimum supported versions, see MongoDB Server Version Compatibility.

For best performance, upgrade your source and destination clusters to the most recent MongoDB Server patch release prior to migration. For more information, see Upgrade to the Latest Self-Managed Patch Release of MongoDB.

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Release Notes

1.12