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GitBook: [v0.4-branch] 24 pages and 3 assets modified
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‎docs/.gitbook/assets/architecture.png‎

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‎docs/.gitbook/assets/basic-architecture-diagram (3).svg‎

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‎docs/.gitbook/assets/feast-docs-overview-diagram-2 (3).svg‎

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‎docs/user-guide/feature-retrieval.md‎

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)
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```
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Online serving with Feast is built to be very low latency. Feast Serving provides a [gRPC API](https://api.docs.feast.dev/grpc/feast.serving.pb.html) that is backed by [Redis](https://redis.io/). We also provide support for [Python](https://api.docs.feast.dev/python/), [Go](https://godoc.org/github.com/gojek/feast/sdk/go), and Java clients.
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Online serving with Feast is built to be very low latency. Feast Serving provides a [gRPC API](https://api.docs.feast.dev/grpc/feast.serving.pb.html) that is backed by [Redis](https://redis.io/). We also provide support for [Python](https://api.docs.feast.dev/python/), [Go](https://godoc.org/github.com/gojek/feast/sdk/go), and Java clients.
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‎docs/user-guide/feature-sets.md‎

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client.ingest(cust_trans_fs, customer_data)
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```
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### Making changes to Feature Sets
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In order to facilitate the need for feature set definitions to change over time, a limited set of changes can be made to existing feature sets.
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To apply changes to a feature set:
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```text
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# With existing feature set
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cust_trans_fs = FeatureSet.from_yaml("customer_transactions_feature_set.yaml")
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# Add new feature
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cust_trans_fs.add(Feature(name="avg_basket_size", dtype=ValueType.INT32))
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# Apply changed feature set
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client.apply(cust_trans_fs)
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```
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Permitted changes include:
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* Adding new features
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* Deleting existing features \(note that deleted features are _tombstoned_ and remain on record_,_ rather than removed completely; as a result, new features will not be able to take the names of these deleted features\)
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* Changing features' TFX schemas
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* Changing the feature set's source and max age
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Note that the following are **not** allowed:
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* Changes to project or name of the feature set.
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* Changes to entities.
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* Changes to names and types of existing features.
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