dualfroz
3461e6bce4
The expirable LRU cache backing the prepared statement store starts a background deleteExpired goroutine when it is created with a non-zero TTL. Its Close method was commented out, so the goroutine kept running for the lifetime of the process and leaked every time a PreparedStmtDB was discarded (for example when a *sql.DB is closed and reopened), causing steady goroutine and memory growth in long-running services. Expose LRU.Close, add Close to the stmt_store.Store interface and its lruStore implementation, and call it from PreparedStmtDB.Close so the background cleanup goroutine is stopped together with the cached statements. Close is idempotent and safe for concurrent use. Refs #7788