Jordan Lee

Prometheus scrape TLS handshake failure after streaming service cert rotation

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Prometheus scrape TLS handshake failure after streaming service cert rotation Problem Symptoms and impact After a scheduled certificate rotation on the real‑time streaming platform, Prometheus began reporting scrape errors for the affected endpoint: 2026-10-19T08:15:32.123Z level=error msg=”scrape failed” target=”streaming-prod.example.com:443″ err=”Get \”https://streaming-prod.example.com/metrics\”: remote error: tls: handshake failure” 2026-10-19T08:15:32.124Z level=error msg=”scrape failed” target=”streaming-prod.example.com:443″ err=”connection reset by peer” Prometheus … Read more

Azure VM model loading timeout after DR failover to secondary region

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Problem – Model Loading Timeout After DR Failover to Secondary Region During a planned disaster‑recovery (DR) failover, traffic is redirected from the primary Azure region to a secondary region where a standby Azure Virtual Machine (VM) hosts the AI inference service. The service fails to start because the model loading step exceeds the configured startup … Read more

Google Gemini batch job fails to start due to node port conflict

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Problem – Gemini Batch Job Fails to Start with “node port conflict” In a multi‑node Google Gemini deployment on Kubernetes, batch processing jobs are scheduled via the gemini-batch controller. Operators observed that newly created jobs never transition to Running. The pod logs contain a clear error: 2026-10-18T07:42:13.214Z ERROR node_port_conflict.go:87] Failed to bind node port 30001: … Read more

Kafka authentication errors after secret rotation in GPU cluster

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Problem – Kafka authentication failures after secret rotation in a GPU compute cluster After rotating the Kafka SASL credentials stored in the cluster‑wide secret, all producers and consumers running on the A100/H100 GPU nodes start reporting authentication errors. The symptoms include connection timeouts, org.apache.kafka.common.errors.SaslAuthenticationException, and intermittent drops of streaming data used for distributed training jobs. … Read more

Kafka producer OAuth2 authentication fails after internet outage in air‑gapped cluster

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Kafka producer OAuth2 authentication fails after internet outage in an air‑gapped cluster Problem In a production Kafka cluster that is completely air‑gapped, producers and consumers obtain OAuth2 access tokens from an external authorization server (e.g., Keycloak, Auth0). When the corporate internet link goes down, the token acquisition and refresh flow cannot reach the token endpoint, … Read more

TGI service unreachable during benchmark due to DNS resolution failure

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Problem – TGI Service Unreachable During Benchmark During automated performance benchmarking of a Text Generation Inference (TGI) deployment, the benchmark script repeatedly fails with a DNS resolution error: 2026-10-18 14:32:07,123 ERROR benchmark.py: Failed to resolve host “tgi-model-prod.example.com”: Name or service not known Traceback (most recent call last): File “/opt/benchmark/benchmark.py”, line 87, in run ip = … Read more

Pinecone hybrid search relevance mismatch after processing 10k batch queries

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Pinecone Hybrid Search Relevance Mismatch After Processing 10k Batch Queries Problem In a production recommendation pipeline we issue batches of up to 10 000 hybrid search requests to a Pinecone index. Each request supplies a dense embedding vector and a metadata filter (e.g., category = ‘sports’). The first few thousand queries return results ordered by the … Read more

NVIDIA GPU inference queue backlog under high concurrency serving transformers

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Problem – Inference Queue Backlog on NVIDIA GPUs Under High Concurrency During a load test that simulated 10 k RPS of real‑time requests to a BERT‑large transformer served via Triton Inference Server, the following symptoms appeared: Latency spikes from ~30 ms (baseline) to >2 s. HTTP 504 timeout errors from the client library. Server logs showing a growing request_queue_size … Read more

Redis vector store initialization fails with storage class not found locally

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Problem – “Storage class not found” when initializing a Redis vector store locally During local development of an embedding‑retrieval service, the application crashes on start‑up with an exception similar to: Traceback (most recent call last): File “app.py”, line 42, in <module> vector_store = RedisVectorStore.from_documents(docs, embedding) File “…/redis_vector_store.py”, line 87, in from_documents raise ValueError(“Storage class not … Read more

LangChain HPA not scaling pods after CPU threshold breach

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Problem The LangChain service is deployed as a stateless Deployment behind an API gateway in a Kubernetes cluster. An HorizontalPodAutoscaler (HPA) is configured to scale the Deployment based on CPU utilization (target 70%) and a custom latency metric exported to Prometheus. Under load the request latency spikes and the CPU usage reported by the metrics-server … Read more