redis

Redis pod stuck pending PVC on edge node after node reboot

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Rows of black server racks with white logos in a data center

Problem – Redis pod stuck pending PVC on an edge node after node reboot A Redis StatefulSet deployed to an edge‑computing node fails to start. The pod remains in Pending because its PersistentVolumeClaim (redis-data) never becomes Bound. The symptom blocks data persistence and makes the Redis service unavailable. Typical pod description: kubectl describe pod redis-0 … Read more

Redis serialization error in ML training loop

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cable network

Problem Description During a distributed PyTorch training loop, intermediate tensors and model state_dict objects are cached in Redis to enable fast checkpointing between iterations. After a few thousand steps the training job aborts with errors such as: redis.exceptions.ResponseError: ERR value is not a valid integer pickle.UnpicklingError: EOF error while reading a pickle object UnicodeDecodeError: ‘utf-8’ … Read more

Redis upsert operation timeout during peak load

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img IX mining rig inside white and gray room

Problem Description During peak traffic periods the API gateway experiences timeouts when performing upsert operations (SET with NX/XX options or MSET) against a Redis cluster that serves as a write‑through cache. The observed symptoms include: HTTP 504 responses from the gateway. Client‑side logs such as: 2026-06-10T14:32:07.421Z ERROR redis-py.connection: ConnectionError: Error while reading from socket: timeout … Read more

Redis HPA scaling issues with Prometheus metrics

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a rack of servers in a server room

Problem Description In a Kubernetes‑based real‑time data pipeline, Redis is used as an in‑memory cache. The Horizontal Pod Autoscaler (HPA) is configured to scale the downstream consumer pods based on the Prometheus metric redis_memory_used_bytes exposed by redis_exporter. Operators observed the following inconsistent behavior: During brief traffic spikes the HPA adds 3‑4 extra pods, but the … Read more