Engineering Logs for Troubleshooting & Debugging
Problem After migrating the vector search pipeline to a hybrid cloud architecture—on‑premises GPU nodes for heavy‑weight indexing and cloud‑based CPU instances for ingestion and query routing—FAISS index build jobs started exceeding the allocated execution time. The orchestration system aborts the job with a TimeoutError: index build exceeded 1800 s. The failure manifests during both bulk index … Read more
Problem – Empty Retrieval Sets After Tightening RAG Metadata Filters In a hybrid‑cloud RAG pipeline, the vector store is a FAISS index replicated from an on‑premises cluster to public‑cloud endpoints. After a recent rollout that added stricter boolean filters on the region, category, and source_id metadata fields, a growing number of queries returned zero results … Read more
Problem – Retrieval Degradation from Improper Chunk Overlap In a local development sandbox a Retrieval‑Augmented Generation (RAG) pipeline builds a FAISS index from a corpus of text documents. The chunk_size and overlap parameters used during document splitting are mis‑configured, causing two distinct symptoms: Excessive overlap (e.g., overlap = 0.9 * chunk_size) produces many near‑duplicate vectors. … Read more
Problem – FAISS index access denied after EC2 instance reboot During a disaster‑recovery (DR) drill an EC2 instance was launched to replace a failed node. The instance runs a Python service that restores a FAISS index from an S3 bucket using boto3 and then loads the index with faiss.read_index. After the reboot the service crashes … Read more