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LLM Application Frameworks: LangChain & LangGraph: sections and modules
T4.4

LangGraph Runtime: Persistence, HITL & Streaming

Persist graph state with checkpointers, threads and branching.

Lessons
8 lessons
By
Sourav Banerjee
Prerequisites
None

Lessons

Start module
8 lessons
  1. 1
    LangGraph Runtime: Persistence, HITL & Streaming: overview

  2. 2
    Checkpointing and threads

  3. 3
    Interrupts and human-in-the-loop

  4. 4
    Subgraphs

  5. 5
    Async and streaming

  6. 6
    Retry policies and bounded cycles

  7. 7
    State management in practice

  8. 8
    LangGraph Runtime: Persistence, HITL & Streaming: interview questions

Practise and Check

Deliverable
Approval loop: add a checkpointer and an interrupt before the answer node of your M08 graph, resume it after approval, and stream the steps.
Assessment
Answer the five Interview questions without notes, then run the lab.
Interview probe
Finance reports that refund-99 was paid out twice, and the billing team says it got two approval requests for it. The approval itself was given once. How do you investigate?
Common mistakes
  • Sending a notice above interrupt(), so it repeats on every resume
  • Bumping the loop's attempt counter in the router function
  • Retrying a refund call with no key, so the customer is refunded twice

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