I currently use Gluster which has its downsides, but is what I consider near-realtime, but with full filesystem features in a nice fuse wrapper. I'd love it if someone would contrast the performance and more of the features.
I asked him if we would get "real time results?"
He stopped, and looked at me puzzled with a tilted head... "What other kind of time is there?"
Your question is highly reasonable, but I heard a colleague today say that the issue could happen only in a very, very short time period of, say, 2-3 minutes. We routinely work with corner cases of 1-2 ms; so the context is relative :-)
It's also thrashing a bit development wise; there's a lot of features being pruned, and I'm a little concerned what its future looks like as Red Hat push harder down the Ceph route, since they're the main source of code contributions to Gluster.