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First identify the migration framework and target
MongoDB is the database, not the migration framework. A framework tracks applied changes and defines how to reverse them, so first determine whether the project uses Mongock, Liquibase, or another tool. Then record the installed release, the exact migration or changeset ID, and which later changes have already been applied.
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This distinction matters if the target is older than the latest migration. A later change may rely on fields, collections, or data introduced by the target. Reversing the target while leaving dependent changes in place can leave the application and database inconsistent. The available documentation does not establish which framework, release, target, or dependencies a particular project has; those must be checked in that project before choosing a command.
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| Framework and documented feature | Targeting behavior | Important qualification |
|---|---|---|
Mongock v5: undo up-to-change |
Reverses changes through the named ChangeUnit, inclusive; it is a backward range, not a way to undo only an older unit while preserving all later units. | Reversal depends on the ChangeUnit’s rollback logic. Check the installed version and the command’s behavior in the Mongock v5 CLI documentation. |
Liquibase Secure: rollback-one-changeset |
Documented for reversing one non-sequential changeset without affecting other changes. | Confirm that the installed Liquibase edition and version include this capability. The ordinary rollback command reverts changes sequentially until a tag. See the Liquibase rollback-one-changeset documentation. |
Mongock v5: understand the range before running undo
Mongock distinguishes reversing a successfully completed change later (“undo”) from recovery when a change fails during execution (“rollback”). The v5 CLI documents this form:
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./mongock undo up-to-change <CHANGE_UNIT_ID> -aj <APP_JAR>Replace the placeholders with the actual ChangeUnit ID and application JAR path. The command reverses through the named ChangeUnit, inclusive, so it may also reverse earlier units. It does not mean “undo just this older unit and leave every later unit untouched.” Inspect the target’s @RollbackExecution method and, where relevant, @RollbackBeforeExecution before using it. Mongock’s CLI documentation also describes inspecting and comparing migration state.
For a failed change in a non-transactional environment, Mongock may invoke rollback code manually; its FAQ cautions that the attempt is not guaranteed. Treat compensation logic as something to test, not as a promise that failed changes can always be restored. The distinction between rollback after execution failure and undo after a successful change is described in the Mongock FAQ.
Liquibase: distinguish targeted reversal from sequential rollback
Liquibase Secure documents rollback-one-changeset for reversing a single non-sequential changeset. This is distinct from the ordinary rollback command, which backs changes out sequentially until a tag. Do not assume the targeted feature exists in every Liquibase edition or release; verify support against the installed version and the official command documentation.
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Check that reversal is defined and data can be recovered
- Inspect the forward change and its inverse. Confirm that the rollback method or changeset rollback actually reverses the intended operations. A command cannot infer how to restore application-specific data.
- Check dependencies. Identify later applied changes that use the target’s schema or data. A single-change reversal is not automatically safe just because a tool can target one change.
- Review destructive effects. Determine whether rollback drops collections, deletes documents, or transforms values. Recreating a collection or documents does not restore the original contents.
- Make recovery possible. Confirm that a suitable backup or other data-recovery path exists before reversing a destructive change.
- Validate the proposed reversal. Liquibase recommends validating rollback operations; review the effects before execution, especially for operations that remove or rewrite data. See the Liquibase rollback guidance.
Run the rollback and verify both database and history
Once the framework, installed release, target ID, dependency state, rollback implementation, and recovery plan are known, use that framework’s supported operation. Avoid copying a command into production before filling in and checking the project-specific values. Afterward, verify the expected data and schema state as well as the migration framework’s recorded state. For Mongock, use the CLI’s documented state-inspection and comparison operations to help check migration history.
Do not edit an already-applied migration definition or delete its tracking record as a shortcut. Liquibase warns that editing a changeset before rollback can cause a checksum mismatch; rollback is the supported way to alter deployment history. See the Liquibase rollback documentation.
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