1. In the current release it's possible to completely shutdown the cluster. You cannot just cut power, but it's relatively painless to do otherwise. Checkout

1. In the current release it's possible to completely shutdown the cluster. You cannot just cut power, but it's relatively painless to do otherwise. Checkout http://hyperdex.org/doc/06.faults/#shutting-down-and-restoring-a-cluster http://hyperdex.org/doc/06.faults/#shutting-down-and-restori... for more details. 2. Currently you cannot perform OR logic in searches. It'd be relatively easy to add though, so we'll probably do so in the future. It's possible to do two searches concurrently and combine the results. 3. This is an oversight on our part. We have to document it. In the Python bindings, you call it the same way as a regular search, but instead of getting a generator that yields objects, you simply get a number. 4. Currently, things are pretty static. We've got ideas for changing that, but just haven't pursued it yet. Each subspace replicates the data again. The memory cost of a subspace is nearly nothing (just a list of replicas). 5. I think that one-level group-by might be achievable, similar to our sorted_search primitive. There's a lot of research that people have done on this topic, and it's very interesting. That being said, the simple/straightforward approach would probably be what we'd take. Thanks for following the project!