Getting "Version store out of memory" when saving documents

[Ido Ben Ari]

Hi,

For 2 hours the system was throwing the error below whenever the code tried to store (update) a document.

Evenetaully restarting ravedb service seem to resolve the problem. But I am not sure what happened and worried it will happen again.

Could you please help me to find out what happened and why?

Server Build #35191

Microsoft.Isam.Esent.Interop.EsentVersionStoreOutOfMemoryException: Version store out of memory (cleanup already attempted)

   at Microsoft.Isam.Esent.Interop.Api.Check(Int32 err)

   at Microsoft.Isam.Esent.Interop.Api.JetPrepareUpdate(JET_SESID sesid, JET_TABLEID tableid, JET_prep prep)

   at Microsoft.Isam.Esent.Interop.Update..ctor(JET_SESID sesid, JET_TABLEID tableid, JET_prep prep)

   at Raven.Database.Storage.Esent.StorageActions.DocumentStorageActions.AddDocument(String key, Etag etag, RavenJObject data, RavenJObject metadata, InvokeSource source)

   at Raven.Database.Actions.DocumentActions.<>c__DisplayClass19_0.<Put>b__0(IStorageActionsAccessor actions)

Thanks,

Ido

[Tal Weiss]

There is a configuration option to increase the version store size please try to double its value. You are probably running too many concurrent requests and esent is running out of space to store the snapshots

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[Ido Ben Ari]

Thanks Tal.

Is that Raven/Esent/MaxVerPages?

I currently don't have it in the config file, so I assume it's the default value which is 512 per the documentation.

In such case:

<add key="Raven/Esent/MaxVerPages" value="1024" /> under appsettings?

Thanks,

Ido

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[Oren Eini (Ayende Rahien)]

Yes

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[Ido Ben Ari]

Thanks, 

I will do that.

By the way, why hasn't the db recovered from the error (until restarted)?  Even if I stopped almost all calls to DB it persisted across the board.

Thanks,

Ido

[Tal Weiss]

There was probably some kind of read operation that was ongoing.

Are you using stream queries or incremental backup?

In general Esent is different on each windows KB and its internal implementation is known to change between them this is why we developed Voron so we can better control the internals.

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[Vincent Liu]

Hello,

I am having a very low  DatabaseTransactionVersionSizeInMB of 0,0 on the store database. How and mostly where do I add the config you just said? Hope you can help. 

[Oren Eini (Ayende Rahien)]

https://ravendb.net/docs/article-page/3.5/csharp/server/configuration/configuration-options  

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