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Improve Snapshot Delete Concurrency Behavior #51463

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original-brownbear
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This PR improves the concurrency safety of snapshot deletes by ensuring that,
assuming no master-fail-over occurs, every delete operation started concurrently
to a snapshot initialization will successfully complete.

This is an important prerequisite to allowing parallel snapshot repository operations.

WIP: this still requires some dry-up and cleanup

This PR improves the concurrency safety of snapshot deletes by ensuring that,
assuming no master-failover occurs, every delete operation started concurrently
to a snapshot initialization will sucessfully complete.

This is an important prerequesite to allowing parallel snapshot repository operations.
@original-brownbear original-brownbear added >non-issue WIP :Distributed Coordination/Snapshot/Restore Anything directly related to the `_snapshot/*` APIs labels Jan 26, 2020
@elasticmachine
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Pinging @elastic/es-distributed (:Distributed/Snapshot/Restore)

@original-brownbear
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This was implemented elsewhere now

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