Jordan Lee

Prometheus scrape target creation failure for TensorFlow Serving after Helm upgrade

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Problem Description After upgrading the tf-serving Helm chart, Prometheus stopped collecting latency and throughput metrics from TensorFlow Serving pods. The Prometheus server logs contain entries such as: scrape target creation failed: connection refused (target: http://10.1.2.3:8501/metrics) no endpoints found for service “tf-serving” in namespace “ml” – check ServiceMonitor selector error reading body: EOF while scraping TensorFlow … Read more

Meta LLaMA batch inference failures after intermittent cloud API timeouts

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Problem: Meta LLaMA Batch Inference Fails After Intermittent Cloud API Timeouts In a production pipeline that runs large‑scale batch inference on Meta LLaMA, jobs started to abort after a few hundred input files were processed. The failure manifested as unhandled exceptions during both the input fetch phase (cloud storage read) and the result upload phase … Read more

PostgreSQL RAG chunk overlap causing duplicate fragments after event trigger

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Problem – Duplicate Fragments from Overlapping Chunk Inserts In an event‑driven Retrieval‑Augmented Generation (RAG) pipeline, incoming documents are split into overlapping text windows (chunks) and each chunk is stored as a vector in PostgreSQL using the pgvector extension. After a recent deployment, retrieval queries began returning multiple identical fragments, inflating similarity scores and producing noisy … Read more

PyTorch training webhook timeout on A100 cluster after job completion

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Problem – Webhook Timeout After PyTorch Distributed Job Completes on A100/H100 Nodes Observed behavior Training jobs launched with torchrun (TorchElastic) finish successfully on a multi‑node A100 cluster. Immediately after the last epoch, the user‑defined on_finish callback attempts to POST a JSON payload to https://monitor.example.com/notify. The job process exits with a non‑zero status and logs contain: … Read more

Kafka vector index corruption after blue‑green deployment traffic switch

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Problem – Vector Index Corruption After Blue‑Green Traffic Switch During a blue‑green rollout of a streaming analytics pipeline, the new version of the service began writing vector index files (Avro‑encoded embeddings) to a compacted Kafka topic while the previous version was still running. After the traffic cut‑over, downstream consumers started failing with deserialization errors such … Read more

Kafka video/LiDAR timestamp drift after intermittent network on edge node

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Problem – Timestamp Drift Between Video and LiDAR Streams on an Edge Kafka Node In a low‑power edge deployment a local Kafka broker aggregates two high‑rate topics: video‑frames – 30 fps H.264 payloads, timestamps generated by the camera firmware. lidar‑points – 10 Hz point‑cloud packets, timestamps generated by the LiDAR driver. During intermittent Wi‑Fi outages the following … Read more

PyTorch embedding dimension mismatch after restoring checkpoints on new cluster

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PyTorch Embedding Dimension Mismatch After Restoring Checkpoints on a New Cluster Problem Description During a disaster‑recovery startup, a pretrained model fails to load its torch.nn.Embedding layer: RuntimeError: size mismatch for embedding.weight: copying a param with shape torch.Size([50000, 768]) from checkpoint of shape torch.Size([47500, 768]) The error appears as soon as model.load_state_dict(checkpoint[“model_state”]) is called. The rest … Read more

RAG pipeline empty retrieval after Docker container restart in Kubernetes

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Problem – RAG pipeline returns empty retrieval after Docker container restart in Kubernetes Symptom: After a pod restart (e.g., rolling update, node‑drain, or container crash) the Retrieval‑Augmented Generation (RAG) service answers every query with No documents retrieved or an empty list, even though the knowledge base was populated before the restart. Typical log excerpt: 2024-09-15 … Read more

TensorRT inference service fails to bind port after adding new container

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Problem – TensorRT inference service cannot bind required ports after adding a new container On an edge computing node (Jetson or ARM‑based gateway) a Triton Inference Server (TensorRT) container that previously started cleanly now fails with: bind() failed: Address already in use (EADDRINUSE) Triton Inference Server failed to start: Unable to listen on HTTP port … Read more

Hugging Face Transformers evaluation webhook timeout during CI/CD run

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Problem – Webhook Timeout During Hugging Face Transformers Evaluation in CI/CD During the Trainer.evaluate step of an automated CI/CD pipeline, the post‑evaluation callback that ships evaluation metrics to an external monitoring service (e.g., Prometheus Pushgateway, Datadog, custom HTTP endpoint) consistently fails with a timeout error. The CI job aborts after the runner‑enforced timeout (typically 30 seconds) and marks … Read more