Engineering Logs for Troubleshooting & Debugging
Problem – TensorRT Mixed‑Precision Training Jobs Time Out In a distributed training pipeline that leverages TensorRT engine building with FP16 (or INT8‑fallback) on NVIDIA A100 GPUs, the job aborts before completing the expected number of epochs. Typical symptoms include: Training script exits with TensorRTBuilderError: Engine building timed out after 1800 seconds. CUDA watchdog messages in … Read more
Problem Description During high‑throughput batch inference the ONNX Runtime throws an exception similar to: Ort::Exception: Failed to rebuild model index: InvalidArgument – Model index is corrupted. or RuntimeError: Unable to rebuild model index after session reset – possible concurrent modification. The failure occurs after the first batch finishes and subsequent batches either produce incorrect results … Read more
Problem Description During peak traffic (≈10 000 req/min) the Hugging Face Transformers inference service, deployed behind an NGINX Ingress controller on a Kubernetes cluster with Horizontal Pod Autoscaler (HPA) enabled, exhibited a sudden latency increase: Baseline latency: ~50 ms per request. Observed tail latency: 1 s – 2 s, often resulting in client‑side timeouts. NGINX logs showed repeated 504 Gateway Timeout errors: 2024/06/19 12:45:23 … Read more
Hugging Face Transformers SSL/TLS Handshake Failure in a Canary Deployment on Kubernetes Problem Description During a staged rollout of a model‑inference service that uses Hugging Face Transformers, a subset of pods (the canary) repeatedly fail to load pretrained models from https://huggingface.co. The failure manifests as: Log entry from the Transformers library: urllib3.exceptions.SSLError: HTTPSConnectionPool(host=’huggingface.co’, port=443): Max … Read more
Problem Description After a rolling update of the ONNX Runtime (ORT) library in a production Retrieval‑Augmented Generation (RAG) service, the retrieval component consistently returns empty result sets. The symptom manifests as: Search logs contain INFO: Retrieval returned 0 results – query embedding norm is 0.0, check model initialization. Embedding generation logs sometimes show WARN: Embedding … Read more
Problem: RAG Answer Extraction Fails During Canary Deployment in vLLM During a canary rollout of a new vLLM pod (10 % of traffic) the downstream RAG post‑processor intermittently returns an empty string or raises RAGExtractorError. The symptom is observed as incomplete or incorrect answers returned to the client, while the baseline version continues to work. Typical … Read more
Problem Description During local development on an Ubuntu workstation equipped with an NVIDIA GPU, a TensorRT Docker container repeatedly crashes and Docker restarts it in a loop. Typical log excerpts look like one of the following: Failed to initialize TensorRT runtime: CUDA driver version is insufficient for CUDA runtime version libnvidia-ml.so.1: cannot open shared object … Read more
Problem Description A high‑traffic Text Generation Inference (TGI) service is deployed as a StatefulSet on a Kubernetes cluster. During a rolling upgrade the controller stalls after the first pod is updated. Subsequent pods never reach the Running/Ready state, causing a partial service outage and a noticeable drop in request capacity. Typical symptoms observed in the … Read more
Problem Description When launching an MLflow training run that uses the Kubernetes backend, the pod creation fails with an admission‑controller error. The MLflow client reports a kubectl error similar to the following: Error from server (Forbidden): pods “mlflow-train-7f9c8d5b9-xyz” is forbidden: exceeded quota: compute-resources, request: cpu=8, memory=16Gi Other observed messages include: admission webhook “validation.gatekeeper.sh” denied the … Read more
Problem Description In a hybrid‑cloud deployment of a Retrieval‑Augmented Generation (RAG) pipeline that uses vLLM for inference, the retrieval step consistently returns an empty list or null despite: Valid user queries arriving at the API endpoint. Document embeddings successfully indexed in the vector store (e.g., Milvus or Pinecone). No errors reported by the vLLM server … Read more