Major - P3 Add this invariant back (It was removed byDecided that it is better not to add back the invariant so that it eases the updgrade/downgrade logic in case we ever want to support multiple concurrent chunk donations.SERVER-62245). This is possible after 6.0 because: (1)SERVER-60834andSERVER-62281provide a barrier on FCV upgrade to 6.0 that there are no unfinished migrations that possibly started with a binary affected bySERVER-62245; (2) AfterSERVER-62296, a second config.migrationCoordinators document won't possibly be inserted if there already existed one.- No longer catch and ignore TransactionTooOld here and here. Also get rid of MigrationCoordinator::_recoveringMigration, since it is no longer needed.
- Delete jstests/sharding/recover_multiple_migrations_on_stepup.js
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SERVER-62245 MigrationRecovery must not assume that only one migration needs to be recovered
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- Closed
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