Jordan Lee

ONNX Runtime RAG retrieval empty results after rolling update

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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

Haystack SSL/TLS handshake failure with self-signed certificates

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Problem – Haystack TLS Handshake Fails in a Local Development Sandbox When running a multi‑service Haystack stack with Docker Compose, the inter‑node RPC layer aborts with TLS errors such as: SSLHandshakeException: certificate verify failed (self signed certificate in certificate chain) javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated OpenSSL error: verify error:num=20:unable to get local issuer certificate HaystackNodeError: TLS … Read more

Grafana tokenizer encoding errors with non-UTF-8 log data

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Problem Description – Tokenizer Encoding Errors in Grafana In a multi‑tenant machine‑learning monitoring platform hosted on AWS Managed Grafana, engineers observed intermittent failures when visualizing log and trace data sourced from Loki. The Log panel rendered a generic error message such as: panic: runtime error: invalid UTF-8 sequence in log tokenization goroutine 112 [running]: pkg/logql/lexer.go:123 … Read more

RAG answer extraction fails during canary deployment in vLLM

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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

Redis upsert operation timeout during peak load

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Problem Description During peak traffic periods the API gateway experiences timeouts when performing upsert operations (SET with NX/XX options or MSET) against a Redis cluster that serves as a write‑through cache. The observed symptoms include: HTTP 504 responses from the gateway. Client‑side logs such as: 2026-06-10T14:32:07.421Z ERROR redis-py.connection: ConnectionError: Error while reading from socket: timeout … Read more

RAG inference query decomposition failure in Meta LLaMA

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Problem: RAG Inference Query Decomposition Failure in Meta LLaMA In a multi‑tenant managed service built on Meta LLaMA 2, the Retrieval‑Augmented Generation (RAG) pipeline is expected to split a user prompt into logical sub‑queries, embed each sub‑query, and retrieve relevant documents from tenant‑isolated indexes. Recent incidents show that complex, multi‑sentence prompts are either truncated or produce empty sub‑queries, … Read more

OpenAI GPT-4 RAG chunk overlap misconfiguration symptoms

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Problem Description – Symptoms of Mis‑configured RAG Chunk Overlap In a high‑throughput API gateway serving real‑time GPT‑4 generation, engineers observed the following pattern during peak traffic: Inference latency increased from ~300 ms to 1.2–2 s per request. Occasional InvalidRequestError: “total tokens exceed model maximum of 8192” errors. Responses contained duplicated passages and, in some cases, contradictory statements. … Read more

Haystack DocumentRetriever context window overflow with long documents

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Problem – Context Window Overflow When Using Haystack DocumentRetriever In a production data pipeline that ingests long technical reports (PDFs, Word docs, etc.), the DocumentRetriever backed by ElasticsearchDocumentStore returns whole document sections that exceed the token limit of downstream LLMs. The pipeline aborts with errors such as: Token limit exceeded: 8192 tokens (max 4096) ElasticsearchDocumentStoreError: Document … Read more

Weaviate streaming API incomplete results under high traffic

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Weaviate Streaming API Incomplete Results Under High Traffic Problem – Symptoms and Impact During peak load the /v1/objects/{className}/{id}/stream endpoint returns truncated JSON payloads or the client receives a connection reset by peer error. Typical observations include: Logs in Weaviate: 2024-05-12T14:23:07Z WARN streaming response incomplete: expected 12456 bytes, got 8421 API gateway (Kong) reports: 504 Gateway … Read more

TensorRT container crashes repeatedly on Ubuntu with NVIDIA GPU

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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