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Provide minSequenceNr for snapshot deletion (#25590)

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* Provide minSequenceNr for snapshot deletion

Journals can use this to make the bulk deletion more efficient

Use keepNrBatches to delete the last few snapshots in case previous
deletes failed.
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Christopher Batey 2018-09-25 13:38:18 +01:00 • committed by GitHub
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akka-docs/src/main/paradox/persistence.md
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@ -693,7 +693,9 @@ A persistent actor can delete individual snapshots by calling the `deleteSnapsho
when the snapshot was taken.
To bulk-delete a range of snapshots matching `SnapshotSelectionCriteria`,
persistent actors should use the `deleteSnapshots` method.
persistent actors should use the `deleteSnapshots` method. Depending on the journal used this might be inefficient. It is
best practice to do specific deletes with `deleteSnapshot` or to include a `minSequenceNr` as well as a `maxSequenceNr`
for the `SnapshotSelectionCriteria`.
### Snapshot status handling