Implement Checkpointer for DynamoDB

[jdbaker01]

Implement the checkpoint interface in langchain (https://langchain-ai.github.io/langgraph/how-tos/persistence/?ref=blog.langchain.dev) for DynamoDB. This should include both checkpoint and memory store.

[jdbaker01]

For first time contributors interested in taking up this feature, I am available to assist with the design and mentoring as part of you taking up the development task.

[zhaoJoseph]

Hi, me and a team of 4 from University of Toronto are interested in this feature. Can this task be finished in a couple of weeks?

[Pierozi]

I'm not sure if this feature should be included here as it concern Langgraph package.
@zhaoJoseph look at the postgres one if you are interested to contribute https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-postgres

it's quite a simple task, but you must have good DynamoDB access pattern knowledge to properly use the primary keys.

[zhaoJoseph]

Thanks for the clarification and guidance. I am also confused why this is under langchain-aws, also a maintainer from langgraph stated that they are only providing implementations for partner providers. langchain-ai/langgraph#1351, thanks anyway.

[tomaszdudek7]

@3coins - https://github.com/langchain-ai/langchain-aws/tree/main/libs/langgraph-checkpoint-aws - is that codebase connected to this issue?

What will be the underlying database on AWS used for checkpointing? I'm not sure if DDB is the right choice, due to 400KB item limit.

Any more details you can share with us? :D I'm really interested in this feature, but if you guys are building it, I don't want to reinvent the wheel.

[rohitkf]

For first time contributors interested in taking up this feature, I am available to assist with the design and mentoring as part of you taking up the development task.

I'm interesting in contributing to this one