Add invariants in the legacy migration chunk cloner to ensure that documents are not being written after the last batch has been transferred and write unit tests.
- depends on
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SERVER-22656 Componentize Migration{Source,Dest}Manager
- Closed
- related to
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SERVER-27215 Some invariants in MigrationChunkClonerSourceLegacy are not applicable to broadcast multi-update and multi-delete
- Closed