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anshishrivastava commented Jan 27, 2026 •

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Summary

Adds DynamoDB-specific list update functionality to avoid inefficient read-modify-write patterns for array-based features. This implements the solution requested in #5687.

Fixes #5687

Changes

Add update_online_store() and update_online_store_async() methods to DynamoDBOnlineStore class
Add corresponding methods to FeatureStore class for user-facing API
Support DynamoDB UpdateItem with list_append expressions for efficient array operations
Implement proper list serialization for all ValueProto list types
Add comprehensive unit tests for both DynamoDB online store and FeatureStore methods
Maintain 100% backward compatibility with existing write_to_online_store behavior
DynamoDB-specific functionality kept separate from core OnlineStore interface

Testing

Added comprehensive unit tests for DynamoDB online store update methods
Added FeatureStore integration tests for both sync and async methods
All tests pass and maintain backward compatibility.

Usage Example

# Append new transactions to existing transaction history
store.update_online_store(
    feature_view_name="user_transactions",
    df=new_transactions_df,
    update_expressions={
        "transaction_history": "list_append(transaction_history, :new_val)",
        "recent_amounts": "list_append(:new_val, recent_amounts)[:10]"  # sliding window
    }
)


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anshishrivastava requested a review from a team as a code owner

January 27, 2026 21:47

anshishrivastava mentioned this pull request

Jan 27, 2026

Add DynamoDB in-place list update support for array-based features #5687

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anshishrivastava changed the title ~~feat: add DynamoDB in-place list update support for array-based features~~ Feat: add DynamoDB in-place list update support for array-based features

Jan 27, 2026

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Devin Review found 2 potential issues.

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sdk/python/feast/infra/online_stores/dynamodb.py Resolved

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anshishrivastava force-pushed the feat/dynamodb-list-updates branch from a69361f to 45b218f Compare

January 27, 2026 21:53

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anshishrivastava changed the title ~~Feat: add DynamoDB in-place list update support for array-based features~~ feat: add DynamoDB in-place list update support for array-based features

Jan 27, 2026

anshishrivastava changed the title ~~feat: add DynamoDB in-place list update support for array-based features~~ feat: Add DynamoDB in-place list update support for array-based features

Jan 27, 2026

anshishrivastava commented Jan 27, 2026

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Reviewing the devin analysis

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Jan 28, 2026

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anshishrivastava force-pushed the feat/dynamodb-list-updates branch 3 times, most recently from c3d81ed to eff9006 Compare

January 29, 2026 22:27

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anshishrivastava force-pushed the feat/dynamodb-list-updates branch from eff9006 to 8221600 Compare

January 29, 2026 22:47

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one small nit but otherwise this lgtm

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anshishr added 2 commits

January 30, 2026 18:17


          feat: add DynamoDB in-place list update support for array-based features

aca9589

This PR adds support for in-place list updates (append/prepend) for
array-based features in DynamoDB online store, addressing issue feast-dev#5687.

Key changes:
- Add update_online_store() and update_online_store_async() methods to
  FeatureStore for list operations on existing feature values
- Implement read-modify-write pattern in DynamoDB store to handle list
  operations while maintaining compatibility with existing protobuf
  serialization format
- Add comprehensive tests for list append, prepend, mixed operations,
  and new entity handling

The implementation uses a read-modify-write approach because existing
data is stored as serialized protobuf bytes, not native DynamoDB lists.
This maintains backward compatibility with existing online_read methods.

Signed-off-by: Anshi Shrivastava <[email protected]>


          refactor: remove sync update_online_store, keep only async version

9dd1ab9

Per reviewer feedback, removed the synchronous update_online_store method
and renamed update_online_store_async to update_online_store.

Signed-off-by: Anshi Shrivastava <[email protected]>

anshishrivastava force-pushed the feat/dynamodb-list-updates branch from c1cf89c to 9dd1ab9 Compare

January 30, 2026 23:18

anshishrivastava commented Jan 30, 2026

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@franciscojavierarceo -Thanks for the feedback on leaving the async version - updated. Feel free to merge, good to go.

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anshishrivastava added 2 commits

February 2, 2026 11:53


          Merge branch 'master' into feat/dynamodb-list-updates

5220c2e


          Merge branch 'master' into feat/dynamodb-list-updates

118cab2

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sdk/python/feast/infra/online_stores/dynamodb.py

		)

		# Process each entity update
		for entity_key, features, timestamp, _ in _latest_data_to_write(data):

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🔴 Using _latest_data_to_write discards multiple list updates for the same entity in a batch

The update_online_store and update_online_store_async methods use _latest_data_to_write(data) to iterate over data, which deduplicates records by keeping only the latest record per entity key.

Click to expand

Problem

The _latest_data_to_write function at dynamodb.py:1166-1173 is designed to keep only the record with the latest timestamp for each entity:

def _latest_data_to_write(data):
    as_hashable = ((d[0].SerializeToString(), d) for d in data)
    sorted_data = sorted(as_hashable, key=lambda ah: (ah[0], ah[1][2]))
    return (v for _, v in OrderedDict((ah[0], ah[1]) for ah in sorted_data).items())

This is correct for normal writes (where you want to overwrite with the latest value), but incorrect for list append/prepend operations.

Impact

If a user tries to append multiple items to the same entity's list in a single batch call, only the item with the latest timestamp will actually be appended. For example:

Appending ["tx1"] at timestamp T1
Appending ["tx2"] at timestamp T2
Appending ["tx3"] at timestamp T3

Only ["tx3"] will be appended because _latest_data_to_write discards the first two records.

Expected vs Actual

Expected: All list updates in the batch should be processed sequentially
Actual: Only the update with the latest timestamp per entity is processed

Recommendation: For list update operations, process all records in order without deduplication. Either remove the _latest_data_to_write call in update_online_store/update_online_store_async methods, or create a new iteration function that preserves all records while still sorting by timestamp to ensure correct ordering of appends.

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franciscojavierarceo approved these changes

Feb 4, 2026

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franciscojavierarceo merged commit aa5973f into feast-dev:master

Feb 4, 2026

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YassinNouh21 pushed a commit to YassinNouh21/feast that referenced this pull request

Feb 7, 2026


          feat: Add DynamoDB in-place list update support for array-based featu…

5b6cceb

…res (feast-dev#5916)

Signed-off-by: yassinnouh21 <[email protected]>

YassinNouh21 pushed a commit to YassinNouh21/feast that referenced this pull request

Feb 7, 2026


          feat: Add DynamoDB in-place list update support for array-based featu…

f8599f1

…res (feast-dev#5916)

Signed-off-by: yassinnouh21 <[email protected]>

franciscojavierarceo pushed a commit that referenced this pull request

Feb 17, 2026


          chore(release): release 0.60.0

7de3db1

# [0.60.0](v0.59.0...v0.60.0) (2026-02-17)

### Bug Fixes

* Added a flag to correctly download the go binaries ([0f77135](0f77135))
* Adds mapping of date Trino's type into string Feast's type ([531e839](531e839))
* **ci:** Use uv run for pytest in master_only benchmark step ([#5957](#5957)) ([5096010](5096010))
* Disable materialized odfvs for historical retrieval ([#5880](#5880)) ([739d28a](739d28a))
* Fix linting and formatting issues ([#5907](#5907)) ([42ca14a](42ca14a))
* Make timestamp field handling  compatible with Athena V3 ([#5936](#5936)) ([e2bad34](e2bad34))
* Support pgvector under non-default schema ([#5970](#5970)) ([c636cd4](c636cd4))
* unit tests not running on main branch ([#5909](#5909)) ([62fe664](62fe664))
* Update java dep which blocking release ([#5903](#5903)) ([a5b8186](a5b8186))
* Update the dockerfile with golang 1.24.12. ([#5918](#5918)) ([be1b522](be1b522))
* Use context.Background() in client constructors ([#5897](#5897)) ([984f93a](984f93a))

### Features

* Add blog post for PyTorch ecosystem announcement ([#5906](#5906)) ([d2eb629](d2eb629))
* Add blog post on Feast dbt integration ([#5915](#5915)) ([b3c8138](b3c8138))
* Add DynamoDB in-place list update support for array-based features ([#5916](#5916)) ([aa5973f](aa5973f))
* Add HTTP connection pooling for remote online store client ([#5895](#5895)) ([e022bf8](e022bf8))
* Add integration tests for dbt import ([#5899](#5899)) ([a444692](a444692))
* Add lazy initialization and feature service caching ([#5924](#5924)) ([b37b7d0](b37b7d0))
* Add multiple entity support to dbt integration ([#5901](#5901)) ([05a4fb5](05a4fb5)), closes [#5872](#5872)
* Add PostgreSQL online store support for Go feature server ([#5963](#5963)) ([b8c6f3d](b8c6f3d))
* Add publish docker image of Go feature server. ([#5923](#5923)) ([759d8c6](759d8c6))
* Add Set as feature type ([#5888](#5888)) ([52458fc](52458fc))
* Added online server worker config support in operator ([#5926](#5926)) ([193c72a](193c72a))
* Added support for OpenLineage integration ([#5884](#5884)) ([df70d8d](df70d8d))
* Adjust ray offline store to support abfs(s) ADLS Azure Storage ([#5911](#5911)) ([d6c0b2d](d6c0b2d))
* Batch_engine config injection in feature_store.yaml through operator ([#5938](#5938)) ([455d56c](455d56c))
* Consolidate Python packaging - remove setup.py/setup.cfg, standardize on pyproject.toml and uv ([16696b8](16696b8))
* **go:** Add MySQL registry store support for Go feature server ([#5933](#5933)) ([19f9bb8](19f9bb8))
* Improve local dev experience with file-aware hooks and auto parallelization ([#5956](#5956)) ([839b79e](839b79e))
* Modernize precommit hooks and optimize test performance ([#5929](#5929)) ([ea7d4fa](ea7d4fa))
* Optimize container infrastructure for production ([#5881](#5881)) ([5ebdac8](5ebdac8))
* Optimize DynamoDB online store for improved latency ([#5889](#5889)) ([fcc8274](fcc8274))

soooojinlee pushed a commit to soooojinlee/feast that referenced this pull request

Feb 18, 2026


          chore(release): release 0.60.0

3b56ca5

# [0.60.0](feast-dev/feast@v0.59.0...v0.60.0) (2026-02-17)

### Bug Fixes

* Added a flag to correctly download the go binaries ([0f77135](feast-dev@0f77135))
* Adds mapping of date Trino's type into string Feast's type ([531e839](feast-dev@531e839))
* **ci:** Use uv run for pytest in master_only benchmark step ([feast-dev#5957](feast-dev#5957)) ([5096010](feast-dev@5096010))
* Disable materialized odfvs for historical retrieval ([feast-dev#5880](feast-dev#5880)) ([739d28a](feast-dev@739d28a))
* Fix linting and formatting issues ([feast-dev#5907](feast-dev#5907)) ([42ca14a](feast-dev@42ca14a))
* Make timestamp field handling  compatible with Athena V3 ([feast-dev#5936](feast-dev#5936)) ([e2bad34](feast-dev@e2bad34))
* Support pgvector under non-default schema ([feast-dev#5970](feast-dev#5970)) ([c636cd4](feast-dev@c636cd4))
* unit tests not running on main branch ([feast-dev#5909](feast-dev#5909)) ([62fe664](feast-dev@62fe664))
* Update java dep which blocking release ([feast-dev#5903](feast-dev#5903)) ([a5b8186](feast-dev@a5b8186))
* Update the dockerfile with golang 1.24.12. ([feast-dev#5918](feast-dev#5918)) ([be1b522](feast-dev@be1b522))
* Use context.Background() in client constructors ([feast-dev#5897](feast-dev#5897)) ([984f93a](feast-dev@984f93a))

### Features

* Add blog post for PyTorch ecosystem announcement ([feast-dev#5906](feast-dev#5906)) ([d2eb629](feast-dev@d2eb629))
* Add blog post on Feast dbt integration ([feast-dev#5915](feast-dev#5915)) ([b3c8138](feast-dev@b3c8138))
* Add DynamoDB in-place list update support for array-based features ([feast-dev#5916](feast-dev#5916)) ([aa5973f](feast-dev@aa5973f))
* Add HTTP connection pooling for remote online store client ([feast-dev#5895](feast-dev#5895)) ([e022bf8](feast-dev@e022bf8))
* Add integration tests for dbt import ([feast-dev#5899](feast-dev#5899)) ([a444692](feast-dev@a444692))
* Add lazy initialization and feature service caching ([feast-dev#5924](feast-dev#5924)) ([b37b7d0](feast-dev@b37b7d0))
* Add multiple entity support to dbt integration ([feast-dev#5901](feast-dev#5901)) ([05a4fb5](feast-dev@05a4fb5)), closes [feast-dev#5872](feast-dev#5872)
* Add PostgreSQL online store support for Go feature server ([feast-dev#5963](feast-dev#5963)) ([b8c6f3d](feast-dev@b8c6f3d))
* Add publish docker image of Go feature server. ([feast-dev#5923](feast-dev#5923)) ([759d8c6](feast-dev@759d8c6))
* Add Set as feature type ([feast-dev#5888](feast-dev#5888)) ([52458fc](feast-dev@52458fc))
* Added online server worker config support in operator ([feast-dev#5926](feast-dev#5926)) ([193c72a](feast-dev@193c72a))
* Added support for OpenLineage integration ([feast-dev#5884](feast-dev#5884)) ([df70d8d](feast-dev@df70d8d))
* Adjust ray offline store to support abfs(s) ADLS Azure Storage ([feast-dev#5911](feast-dev#5911)) ([d6c0b2d](feast-dev@d6c0b2d))
* Batch_engine config injection in feature_store.yaml through operator ([feast-dev#5938](feast-dev#5938)) ([455d56c](feast-dev@455d56c))
* Consolidate Python packaging - remove setup.py/setup.cfg, standardize on pyproject.toml and uv ([16696b8](feast-dev@16696b8))
* **go:** Add MySQL registry store support for Go feature server ([feast-dev#5933](feast-dev#5933)) ([19f9bb8](feast-dev@19f9bb8))
* Improve local dev experience with file-aware hooks and auto parallelization ([feast-dev#5956](feast-dev#5956)) ([839b79e](feast-dev@839b79e))
* Modernize precommit hooks and optimize test performance ([feast-dev#5929](feast-dev#5929)) ([ea7d4fa](feast-dev@ea7d4fa))
* Optimize container infrastructure for production ([feast-dev#5881](feast-dev#5881)) ([5ebdac8](feast-dev@5ebdac8))
* Optimize DynamoDB online store for improved latency ([feast-dev#5889](feast-dev#5889)) ([fcc8274](feast-dev@fcc8274))

Signed-off-by: soojin <[email protected]>

jyejare pushed a commit to opendatahub-io/feast that referenced this pull request

Mar 9, 2026


          feat: Add DynamoDB in-place list update support for array-based featu…

23192c6

…res (feast-dev#5916)

Shizoqua pushed a commit to Shizoqua/feast that referenced this pull request

Mar 18, 2026


          feat: Add DynamoDB in-place list update support for array-based featu…

176ed0d

…res (feast-dev#5916)

Signed-off-by: Shizoqua <[email protected]>

Shizoqua pushed a commit to Shizoqua/feast that referenced this pull request

Mar 18, 2026


          chore(release): release 0.60.0

4b51239

# [0.60.0](feast-dev/feast@v0.59.0...v0.60.0) (2026-02-17)

### Bug Fixes

* Added a flag to correctly download the go binaries ([0f77135](feast-dev@0f77135))
* Adds mapping of date Trino's type into string Feast's type ([531e839](feast-dev@531e839))
* **ci:** Use uv run for pytest in master_only benchmark step ([feast-dev#5957](feast-dev#5957)) ([5096010](feast-dev@5096010))
* Disable materialized odfvs for historical retrieval ([feast-dev#5880](feast-dev#5880)) ([739d28a](feast-dev@739d28a))
* Fix linting and formatting issues ([feast-dev#5907](feast-dev#5907)) ([42ca14a](feast-dev@42ca14a))
* Make timestamp field handling  compatible with Athena V3 ([feast-dev#5936](feast-dev#5936)) ([e2bad34](feast-dev@e2bad34))
* Support pgvector under non-default schema ([feast-dev#5970](feast-dev#5970)) ([c636cd4](feast-dev@c636cd4))
* unit tests not running on main branch ([feast-dev#5909](feast-dev#5909)) ([62fe664](feast-dev@62fe664))
* Update java dep which blocking release ([feast-dev#5903](feast-dev#5903)) ([a5b8186](feast-dev@a5b8186))
* Update the dockerfile with golang 1.24.12. ([feast-dev#5918](feast-dev#5918)) ([be1b522](feast-dev@be1b522))
* Use context.Background() in client constructors ([feast-dev#5897](feast-dev#5897)) ([984f93a](feast-dev@984f93a))

### Features

* Add blog post for PyTorch ecosystem announcement ([feast-dev#5906](feast-dev#5906)) ([d2eb629](feast-dev@d2eb629))
* Add blog post on Feast dbt integration ([feast-dev#5915](feast-dev#5915)) ([b3c8138](feast-dev@b3c8138))
* Add DynamoDB in-place list update support for array-based features ([feast-dev#5916](feast-dev#5916)) ([aa5973f](feast-dev@aa5973f))
* Add HTTP connection pooling for remote online store client ([feast-dev#5895](feast-dev#5895)) ([e022bf8](feast-dev@e022bf8))
* Add integration tests for dbt import ([feast-dev#5899](feast-dev#5899)) ([a444692](feast-dev@a444692))
* Add lazy initialization and feature service caching ([feast-dev#5924](feast-dev#5924)) ([b37b7d0](feast-dev@b37b7d0))
* Add multiple entity support to dbt integration ([feast-dev#5901](feast-dev#5901)) ([05a4fb5](feast-dev@05a4fb5)), closes [feast-dev#5872](feast-dev#5872)
* Add PostgreSQL online store support for Go feature server ([feast-dev#5963](feast-dev#5963)) ([b8c6f3d](feast-dev@b8c6f3d))
* Add publish docker image of Go feature server. ([feast-dev#5923](feast-dev#5923)) ([759d8c6](feast-dev@759d8c6))
* Add Set as feature type ([feast-dev#5888](feast-dev#5888)) ([52458fc](feast-dev@52458fc))
* Added online server worker config support in operator ([feast-dev#5926](feast-dev#5926)) ([193c72a](feast-dev@193c72a))
* Added support for OpenLineage integration ([feast-dev#5884](feast-dev#5884)) ([df70d8d](feast-dev@df70d8d))
* Adjust ray offline store to support abfs(s) ADLS Azure Storage ([feast-dev#5911](feast-dev#5911)) ([d6c0b2d](feast-dev@d6c0b2d))
* Batch_engine config injection in feature_store.yaml through operator ([feast-dev#5938](feast-dev#5938)) ([455d56c](feast-dev@455d56c))
* Consolidate Python packaging - remove setup.py/setup.cfg, standardize on pyproject.toml and uv ([16696b8](feast-dev@16696b8))
* **go:** Add MySQL registry store support for Go feature server ([feast-dev#5933](feast-dev#5933)) ([19f9bb8](feast-dev@19f9bb8))
* Improve local dev experience with file-aware hooks and auto parallelization ([feast-dev#5956](feast-dev#5956)) ([839b79e](feast-dev@839b79e))
* Modernize precommit hooks and optimize test performance ([feast-dev#5929](feast-dev#5929)) ([ea7d4fa](feast-dev@ea7d4fa))
* Optimize container infrastructure for production ([feast-dev#5881](feast-dev#5881)) ([5ebdac8](feast-dev@5ebdac8))
* Optimize DynamoDB online store for improved latency ([feast-dev#5889](feast-dev#5889)) ([fcc8274](feast-dev@fcc8274))

Signed-off-by: Shizoqua <[email protected]>

ericdelorefice mentioned this pull request

Oct 19, 2026

fix: Stop DynamoDB update_online_store overwriting the item when its read fails #7046

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Add DynamoDB in-place list update support for array-based features

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anshishrivastava commented Jan 27, 2026 • edited by devin-ai-integration Bot Loading Uh oh! There was an error while loading. Please reload this page.

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anshishrivastava commented Jan 27, 2026 •

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