bytedance/deer-flow · error · HTTPException

Failed to validate checkpoint

Error message

Failed to validate checkpoint

What it means

HTTP 500 raised when checkpointer.aget_tuple() throws while validating a client-supplied checkpoint reference (checkpoint_id/checkpoint_ns/checkpoint_map). The gateway logs the full exception (with sanitized thread id) but returns a generic detail so internal errors don't leak. It is an infrastructure failure, not a bad request.

Source

Thrown at backend/app/gateway/services.py:974

    if not checkpoint_id:
        return

    read_config: dict[str, Any] = {
        "configurable": {
            "thread_id": thread_id,
            "checkpoint_ns": checkpoint_ns,
            "checkpoint_id": str(checkpoint_id),
        }
    }
    if checkpoint_map is not None:
        read_config["configurable"]["checkpoint_map"] = checkpoint_map

    checkpointer = get_checkpointer(request)
    try:
        checkpoint_tuple = await checkpointer.aget_tuple(read_config)
    except Exception as exc:
        logger.exception("Failed to validate checkpoint %s for thread %s", checkpoint_id, sanitize_log_param(thread_id))
        raise HTTPException(status_code=500, detail="Failed to validate checkpoint") from exc
    if checkpoint_tuple is None:
        raise HTTPException(status_code=404, detail=f"Checkpoint {checkpoint_id} not found")

    configurable = config.setdefault("configurable", {})
    if not isinstance(configurable, dict):
        raise HTTPException(status_code=400, detail="request config configurable must be an object")
    configurable["thread_id"] = thread_id
    configurable["checkpoint_ns"] = checkpoint_ns
    configurable["checkpoint_id"] = str(checkpoint_id)
    if checkpoint_map is not None:
        configurable["checkpoint_map"] = checkpoint_map


async def ensure_checkpoint_history_seeded(
    request: Request,
    *,
    thread_id: str,
    assistant_id: str | None,

View on GitHub (pinned to 1dd6ba1acb)

Solutions

1. Check gateway logs for the 'Failed to validate checkpoint' exception — it carries the real cause (connection error, deserialization stack).
2. Restore/verify the checkpoint store health (DB up, migrations applied, Redis memory) and retry.
3. If the checkpoint is optional, retry the run without checkpoint_id to confirm the store is the issue.

catch 500 'Failed to validate checkpoint'; retry with backoff (store-level transient errors are the usual cause); if persistent, check gateway logs for the underlying exception.

When it happens

Trigger: A run referencing a checkpoint_id while the backing checkpoint store (DB/Redis) errors on read: connection loss, timeout, deserialization failure of a stored checkpoint blob.

Common situations: Database outage or restart under load; corrupted checkpoint rows after a schema/version change; Redis eviction of checkpoint data in cache-backed checkpointers.

Related errors

• Failed to inspect checkpoint history
• Failed to read latest checkpoint
• checkpoint must be an object
• checkpoint thread_id does not match request thread_id
• Checkpoint {checkpoint_id} not found

AI-assisted analysis of bytedance/deer-flow@1dd6ba1acb (2026-08-14). Data as JSON: /api/errors/7657abbb8ff33b28. Report an issue: GitHub.