Data Infrastructure

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

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

PostgreSQL pod fails to start after ConfigMap mount error in dev sandbox

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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

RabbitMQ scheduler pod unschedulable during disaster recovery failover

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Problem – RabbitMQ Scheduler Pod Unschedulable During Disaster Recovery Failover During a planned disaster‑recovery (DR) failover, the RabbitMQ rabbitmq-scheduler pod repeatedly enters the Pending state with the following event: Warning FailedScheduling 2m30s (x5 over 5m) default-scheduler 0/3 nodes are available: 3 node(s) had insufficient memory, 3 node(s) had taint {dr/secondary=true:NoSchedule}, and 3 node(s) had pod … Read more

Redis RAG context injection failure after serialization error in pipeline

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Problem – Missing or Corrupted RAG Context after Pipeline Serialization During the nightly data pipeline that populates a Redis vector store for Retrieval‑Augmented Generation (RAG), the downstream language‑model inference service receives prompts that lack the expected retrieved documents. The prompts contain empty context fields or truncated JSON blobs, resulting in hallucinations or incomplete answers. Typical … Read more

Model loading timeout in Docker after Kafka consumer lag increase

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Problem The AI inference service runs inside a Docker container and consumes model artifact messages from a Kafka topic. After a period of increasing consumer lag, the service logs a Model loading timeout error and fails to load the new model version. The container remains healthy, but inference requests continue using the stale model. Root … Read more

Intermittent OAuth2 token acquisition failure in hybrid Elasticsearch after provider timeout

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Problem In a hybrid Elasticsearch deployment (on‑premises nodes + public‑cloud nodes) the indexing and search APIs intermittently return 401 Unauthorized errors. The failure trace points to the OAuth2 token acquisition step performed by the Elasticsearch security module. The issue appears as a burst of token‑acquisition failures lasting from a few seconds up to a minute, … Read more

RabbitMQ replica node stays offline after auto‑scaling in us‑east‑1

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RabbitMQ Replica Node Stays Offline After Auto‑Scaling in us-east-1 Problem In a multi‑region deployment that uses RabbitMQ federation and mirrored queues, the auto‑scaler (AWS Auto Scaling Group) successfully launches new EC2 instances in us-east-1. The instances boot, the RabbitMQ service starts, but the node never joins the existing cluster. The node remains in offline state … Read more

Kafka client token refresh failure inside Docker after container restart

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Problem After a Docker container running a Kafka client is restarted, the client repeatedly fails to authenticate with the broker. The failure manifests as token‑refresh errors and results in Authentication failed: token expired messages. New connections cannot be established until the container is recreated from scratch. Root Cause The Kafka client is configured to use … Read more