A vector log pipeline is a data processing system that transforms raw text, documents, or images into vector embeddings at scale. It consumes data from various sources (databases, message queues, S3), applies embedding models (OpenAI API, Sentence Transformers, custom models), and outputs embeddings to vector stores (Pinecone, Qdrant, or local indices). These pipelines can run in batch mode (Spark, Airflow) for historical data or in streaming mode (Kafka, Flink, Ray) for real-time updates. Vector pipelines are the backbone of RAG (Retrieval-Augmented Generation) systems, semantic search, and recommendation engines. As organizations scale LLM applications, the bottleneck often shifts from model inference to embedding pipeline throughput. Expert pipeline builders ensure that embeddings are indexed within milliseconds of document ingestion, enabling real-time search and retrieval.