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The follow paragraph is no longer true and should be removed. We should link this ticket to the SERVER ticket in which this assumption changed. https://github.com/mongodb/mongo/blob/878e55a460de02de2f0171d3e9e1bcfc12bb80cc/src/mongo/db/repl/oplog.cpp#L148 oplog.cpp /** * Allocates an optime for a new entry in the oplog, and updates the replication coordinator to * reflect that new optime. Returns the new optime and the correct value of the "h" field for * the new oplog entry. * * NOTE: From the time this function returns to the time that the new oplog entry is written * to the storage system, all errors must be considered fatal. This is because the this * function registers the new optime with the storage system and the replication coordinator, * and provides no facility to revert those registrations on rollback. */ void getNextOpTime(OperationContext* opCtx, Collection* oplog, ReplicationCoordinator* replCoord, ReplicationCoordinator::Mode replicationMode, unsigned count, OplogSlot* slotsOut) {

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xgen-internal-githook commented on Fri, 21 Jul 2017 12:44:31 +0000: Author: {u'username': u'andy10gen', u'name': u'Andy Schwerin', u'email': u'schwerin@mongodb.com'} Message: SERVER-30240 Remove obsolete comment in oplog.cpp. This comment was obsoleted by SERVER-15192. Branch: master https://github.com/mongodb/mongo/commit/405b07f373d900e810965a838f1c4bbaf8b16dcb

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