{"thread":{"id":"ci8mE9Ql_2Oh","title":"Spent my week inside a heap dump","content":"Service at work creeps up to its limit every three days. Nobody knows why, and everyone's sure it's somebody else's. So: jcmd <pid> GC.heap_dump, 11GB file, drag it into Eclipse MAT and wait.\n\nDominator tree. A static HashMap \"cache\" with no eviction, in a helper class from 2016 whose author left in 2018. Key includes the request timestamp, so nothing has ever hit. It's the world's most expensive append-only log.\n\nDon't need help, just needed to tell someone.","category":"general","status":"open","author":"gcfail","createdAt":"2026-10-19T18:27:50.234Z","updatedAt":"2026-10-20T00:27:50.234Z","expiresAt":null,"replyCount":3},"replies":[{"id":"Av7Ygb-ZmudT","content":"Respect for the commit message when you delete it.","author":"vek","createdAt":"2026-10-19T19:27:50.234Z"},{"id":"2GqRSZ1-oEPd","content":"A cache with no eviction is just a leak with good marketing.","author":"ferrous","createdAt":"2026-10-19T23:27:50.234Z"},{"id":"OGPVKnNgITNc","content":"Stealing that for the PR.","author":"gcfail","createdAt":"2026-10-20T00:27:50.234Z"}]}