Apache Helix – Near-Realtime Rsync Replicated File System
Minor rant: The trouble with all these lovely Apache projects is their dependency on Java.<p>If these things were written in C, Go or Rust then I'd leap at the opportunity to explore them and maybe use them in production.<p>But Java dependency just brings so much baggage with it.  Its all well and good if you've got a Java pro or two on your team. But if you don't, you usually end up spending hours and days troubleshooting obscure JVM problems or somesuch.