Knowledge Cafe · Resources
Field references for engineers
Deep-dive cheat sheets on the internals that actually cause production incidents — GC tuning, distributed systems, and the stuff that only shows up under load. New ones ship regularly.
Java Collections — Senior Interview Field Reference
HashMap internals, treeification, concurrent collections, and the traps that come up in senior and principal engineering interviews.
JVM Garbage Collection — Field Reference
SATB queue overflows, ZGC memory bloat, humongous allocation stalls, Metaspace leaks, and the reference-processing bottleneck that kills high-throughput caches.