Why did not released hdd space after deleteSnapshots?

[AndreyLadniy]

I try use deleteSnapshots but only have incresed space usage. I can't undestand, plugin only stores additional DeleteEvent and don't delete it from the stream in fact? https://github.com/EventStore/EventStore.Akka.Persistence/blob/35f14449433c227091d28ecedade04bc991e6c1a/src/main/scala/akka/persistence/eventstore/snapshot/EventStoreSnapshotStore.scala#L66

[t3hnar]

Yes, EventStore is an immutable append only storage.

[gregoryyoung]

To be fair it is not immutable scavenge can recover space of things you decide to delete.

On Fri, Feb 23, 2018 at 1:49 PM, Yaroslav Klymko notifications@github.com wrote:

Yes, EventStore is a immutable append only storage.

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[AndreyLadniy]

Yes, EventStore is an immutable append only storage.

This leads to the inability to use the ES through EventStore.Akka.Persistence in production. In my case with frequent snapshots I have 25% for bussines events and 75% for snapshot events with a simple test.

[t3hnar]

@AndreyLadniy you still can set up different storage for snapshots, and keep using event store for events

[gregoryyoung]

Why do you need your old snapshots? Is something as simple as setting maxCount on snapshot streams enough for you?

[AndreyLadniy]

@t3hnar Thanks, I already thought about it, if no solutions can be made with the the ES and do it so. @gregoryyoung I don't need old snapshots, I need only the one last. I can't undestand how it can be made if maxCount can be setted for the concrete stream, but shapshots stream contains the snapshot of every PersistentActor.

[t3hnar]

@AndreyLadniy could you please double check, there should be separate snapshot stream per persistenceId

[AndreyLadniy]

I try use maxCount for every snapshot stream. maxCount hides old snapshots, but uses hdd space which releases with scavege only. So deleteSnapshots can't be used as a part of akka-persistence (for disk space releasing), but deletion can be done with ES side with manual updating maxCount and periodic scavenge

[gregoryyoung]

This is correct. You can also use maxAge to keep snapshots for a given period of time.

On Mon, Feb 26, 2018 at 10:33 AM, Andrey Ladniy notifications@github.com wrote:

I try use maxCount for every snapshot stream. maxCount hides old snapshots, but uses hdd space which releases with scavege only. So deleteSnapshots can't be used as a part of akka-persistence (for disk space releasing), but deletion can be done with ES side with manual updating maxCount and periodic scavenge

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