A developer attempted to use Redis to maintain state for a stateful Message Communication Protocol (MCP) server running on AWS ECS Fargate, but found it did not resolve the issue of session loss during rolling deployments. The experiment showed that while the Redis instance connected and logged session activity, the replacement task failed to retrieve or write session data after a deployment. The root cause was identified within the FastMCP server's StreamableHTTPSessionManager, which did not properly consult Redis for session state after a task restart, leading to 'Session not found' errors. AI
IMPACT Highlights challenges in maintaining stateful services on serverless platforms, impacting the reliability of applications that depend on session persistence.
RANK_REASON Developer troubleshooting a specific infrastructure issue with a common tool (Redis) and finding it ineffective.
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