Repopulate multiple readmodels at the same time

[hvidgaard]

We're starting to get some experience with running a system based on EventFlow in production. At the present I not have much that we need to change, but I would like to repopulate multiple readmodels at the same time. I have an implementation for it made, but I struggle to get it build on my machine such that I can test it out.

Do you have some documentation on how to get the build running locally?

[CapitanMurloc]

Hi,

In EventFlow, the EventFlow.TestHelpers project you have two examples for populating and repopulating a read model. I take it that's what you want?

Suites/TestSuiteForReadModelStore

• RePopulateHandlesManyAggregates
• PopulateCreatesReadModels

[hvidgaard]

Hi

I have multiple readmodels repopulating some times. If I update say 10, it need to fetch events from the DB 10 times, where as if it could repopulate multiple readmodels at the same time, it only fetches events once but updates all the readmodels.

[rasmus]

@hvidgaard is it bulk operations of the same read model or 10 different read models? EventFlow does do updates to different read models at the same time, have a look at DispatchToReadStores. Although, there might be a bug.

What kind of read store are you using? MSSQL?

https://github.com/eventflow/EventFlow/blob/develop-v1/Source/EventFlow/ReadStores/DispatchToReadStores.cs

[hvidgaard-ims]

We're using MSSQL, and are trying to optimize a complete rebuild of all readmodels. It's quite a while since I looked at it, but I think it was reading all events multiple times, instead of just once.

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