understand "extent"

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Hi,

The context is RBD on bluestore. I did check extent on Wiki.
I see "extent" when talking about snapshot and export/import.
For example, when create a snapshot, we mark extents. When
there is write to marked extents, we will make a copy.
I also know that user data on block device maps to objects.
How "extent" and "object" are related?
Can I say extent is a set of continuous objects (with default tripe settings)?


Thanks!
Tony


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