BerriAI/litellm · error · ValueError

Invalid region in ARN: {batch_id}

Error message

Invalid region in ARN: {batch_id}

What it means

Error "Invalid region in ARN: {batch_id}" thrown in BerriAI/litellm.

Source

Thrown at litellm/llms/bedrock/batches/transformation.py:385

            litellm_params: LiteLLM parameters

        Returns:
            Transformed request data for Bedrock GetModelInvocationJob API
        """
        # For Bedrock, batch_id should be the full job ARN
        # The GetModelInvocationJob API expects the full ARN as the identifier
        if not batch_id.startswith("arn:aws:bedrock:"):
            raise ValueError(f"Invalid batch_id format. Expected ARN, got: {batch_id}")

        # Extract the job identifier from the ARN - use the full ARN path part
        # ARN format: arn:aws:bedrock:region:account:model-invocation-job/job-name
        arn_parts: Final = batch_id.split(":")
        if len(arn_parts) < 6:
            raise ValueError(f"Invalid ARN format: {batch_id}")

        region: Final = arn_parts[3]
        if not re.match(r"^[a-z][a-z0-9-]*$", region):
            raise ValueError(f"Invalid region in ARN: {batch_id}")

        # Build the endpoint URL for GetModelInvocationJob
        # AWS API format: GET /model-invocation-job/{jobIdentifier}
        # Use the FULL ARN as jobIdentifier and URL-encode it (includes ':' and '/')
        import urllib.parse as _ul

        encoded_arn: Final = _ul.quote(batch_id, safe="")
        endpoint_url: Final = f"https://bedrock.{region}.amazonaws.com/model-invocation-job/{encoded_arn}"

        # Use common utility for AWS signing
        request_params: Final = merge_bedrock_aws_request_params(litellm_params, optional_params)
        signed_headers, _ = self.common_utils.sign_aws_request(
            service_name="bedrock",
            data={},  # GET request has no body
            endpoint_url=endpoint_url,
            optional_params=request_params,
            method="GET",
        )

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. The ARN contains an invalid region; correct the region in the ARN.

When it happens

Trigger: Thrown at litellm/llms/bedrock/batches/transformation.py:385 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/508fce7c1acc1d26. Report an issue: GitHub.