PostgreSQL "Deadlock Detected" During Concurrent Batch Updates
Deadlocks during concurrent batch updates specifically (as opposed to normal application traffic) almost always come down to multiple batch processes updating...
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Docker Container Healthcheck Stuck in "Starting" State
A container permanently stuck showing "health: starting" rather than transitioning to either "healthy" or "unhealthy" usually means the healthcheck command...
MySQL Connection Pool Exhausted, Too Many Active Connections
A connection pool reporting itself exhausted, even before hitting MySQL's own hard max_connections ceiling, means your application-level pool has run out of...
Nginx WebSockets Connection Failing With 400 Bad Request
A WebSocket connection failing with 400 Bad Request through Nginx almost always means Nginx isn't forwarding the specific headers required for the...
Go Channel Deadlock: Fatal Error "All Goroutines Are Asleep"
Unlike a panic, "all goroutines are asleep - deadlock!" is a fatal error the Go runtime itself detects when literally every goroutine in the program is blocked...
Go "Context Deadline Exceeded" Error Handling in HTTP Requests
"Context deadline exceeded" means an operation using a Go context.Context ran longer than its configured deadline allowed — handling it well means both setting...
Postgres Connection Pool Leak With Node or Python App
A connection pool leak means your application is checking out database connections from the pool but not consistently returning them, so the pool gradually...
Postgres "LOCK TABLE" Deadlock Waiting Forever
An explicit LOCK TABLE statement that just hangs, rather than producing Postgres's usual automatic deadlock error, usually means it's waiting on a lock held by...
Docker Container Slow Performance on macOS (Docker Desktop)
Slow Docker performance specifically on macOS, especially with heavy file I/O like Node.js dependency installs or hot-reloading dev servers, comes down to how...