object_store: delete multiple

[Kinrany]

Problem

I want to delete multiple objects atomically.

Solution

Add a new method to ObjectStore. It would follow the API similar to S3 DeleteObjects

Alternatives

Multiple calls to delete aren't atomic.

Discussion

Not all implementations of ObjectStore support this. We could have an extension trait, ObjectStoreAtomic: ObjectStore.

[Kinrany]

Would you consider accepting a PR that added this? Any thoughts on implementation?

[tustvold]

I believe this is a duplicate of #2615

FWIW S3 DeleteObjects is not atomic, it can partially fail - https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html

In general S3 does not support any atomic operations, it does now provide read-after-write consistency, but it provides no atomic APIs. There is no CreateIfNotExists functionality for example

[Kinrany]

Agreed. And thanks, good to know that about S3.