Engineering Logs for Troubleshooting & Debugging
Problem – PostgreSQL pod fails to start in the development sandbox In a Kubernetes‑based development sandbox the PostgreSQL deployment never reaches the Running state. The pod repeatedly crashes with the following pattern: $ kubectl get pod -n dev-sandbox -l app=postgresql NAME READY STATUS RESTARTS AGE postgresql-7f9c9d8b5b-kt9xv 0/1 CrashLoopBackOff 5 3m12s Inspecting the container logs shows … Read more
Problem After a primary PostgreSQL cluster outage, the standby server was promoted and the database was restored from a recent base backup. Subsequent similarity‑search queries that rely on pgvector indexes start failing with errors such as: ERROR: could not read index file “base/16384/12345”: Invalid argument DETAIL: Index “vector_idx” appears to be corrupted. HINT: Reindex the … Read more
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
PostgreSQL SSL Handshake Failure After Certificate Expiration in Docker Development Problem Description During a local AI model training run, the Python script that connects to the PostgreSQL service via psycopg2 started throwing: psycopg2.OperationalError: SSL SYSCALL error: certificate verify failed PostgreSQL container logs showed the corresponding server‑side error: 2026-09-12 10:45:23.456 UTC [1] LOG: SSL error: certificate … Read more
LLM‑generated SQL function call syntax error on AWS RDS Problem When an application uses a large language model (LLM) to generate SQL for invoking PostgreSQL stored procedures, the resulting statements often fail with errors such as: ERROR: syntax error at or near ‘(‘ ERROR: function my_schema.my_func(integer, text) does not exist ERROR: function my_func(integer, text) does … Read more
Problem Description During rolling restarts or horizontal pod autoscaling of a PostgreSQL StatefulSet, repeated REINDEX CONCURRENTLY operations abort with lock timeouts or out‑of‑memory errors. The symptoms observed in production are: Log entries such as: 2024-07-12 14:03:21.123 UTC [12345] LOG: index build (concurrently) aborted: could not obtain exclusive lock on relation “orders_pkey” 2024-07-12 14:03:21.124 UTC [12345] … Read more
Problem Description The inference API service, built with FastAPI and using psycopg2/SQLAlchemy to query a PostgreSQL instance, started returning HTTP 504 timeouts after a recent firewall rule change. The API logs contain repeated connection errors such as: 2026-08-31 14:02:13,842 ERROR inference.api.handlers – could not connect to server: Connection timed out (0.00s) Is the server running … Read more
Problem Description During development of an AI training pipeline on Docker Desktop’s integrated Kubernetes cluster, the PostgreSQL pod that stores experiment metadata and feature‑store data fails to start. The pod repeatedly enters CrashLoopBackOff and the container logs contain errors such as: 2024-07-15 10:12:34.567 UTC [1] LOG: could not open configuration file “/etc/postgresql/conf.d/custom.conf”: Permission denied 2024-07-15 … Read more
Problem Description After a routine update to the Retrieval‑Augmented Generation (RAG) pipeline, the citation extraction step began returning malformed JSON objects. Downstream the LLM serializer throws errors such as: JSON parsing error: Unexpected token ‘}’ at position 127 ERROR: invalid input syntax for type jsonb Observed symptoms in production logs: API responses missing source_id fields … Read more
PostgreSQL Streaming Query Interrupted Mid‑Execution in an Air‑Gapped Environment Problem Description An AI inference service running inside a sealed laboratory network streams large SELECT result sets from PostgreSQL using a custom asynchronous Python client. During execution the client receives only a partial set of rows and then the connection is terminated. Typical symptoms include: Log … Read more