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When updating the contents of a zone using:

gcloud dns record-sets import RECORDS_FILE --zone=ZONE --delete-all-existing --zone-file-format

Is this operation atomic? i.e. if I have a record in RECORDS_FILE which already exists in the zone, will it continue to serve throughout, or will there be a blip where it's unavailable?

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Using --delete-all-existing flag in gcloud dns record-sets import will delete existing record-sets BEFORE importing the record-sets in the records-file.

If you noticed any blips please open a bug with reproduction steps on Google Issue Tracker and we will investigate it.

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0

It isn't documented if import is transactional, but if you require that, you can use

gcloud dns record-sets transaction

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