Yes, that my second concern. If run on separate JVM, what is the difference between use ZK and use controller? Of course, If the new controller is more stable than ZK, more efficient than ZK, this will bring benefits to users. But this is essentially replacing zk with a better product, I think etcd also can achieve this purpose.
You can get started with pretty junky coax and a homemade antenna, although antenna parts that used to be common are sometimes now less-so. I spent part of my day visiting stores looking for twinlead or ladderline and found none.
I'm part of a TARPN and the main thing we do is chat. There is a simple chat program that runs on the network so we can do realtime multi-user chat. It's pretty fun.
The trick is to get a few Raspberry PIs and install the software. The NinoTNCs are really cheap so you can make a network on your desk without any radios. Then get the radios after you can con some couple of other hams within a few miles to play with it with you. It's a kick.
I think it's something like 30W over a single ethernet cable. I'm running a few devices with PoE that are not network enabled, just conveniently located near an ethernet cable that's not near a power outlet.
Packet radio has made some progress since the 80s :). Here in North Carolina we have a network called TARPN http://tarpn.net/t/packet_radio_networking.html. We use re-purposed commercial radios, RaspberryPis, and custom TNCs for 1200 baud packet links. Some folks are experimenting with higher speed links (9600).
These ISM modules will work on low power for close range links, but you can't just slap an amplifier and call it a day. There are regulatory issues with the tech they use (spread spectrum, wide bandwidth, encryption, etc).
Ordered a RPi Zero W from Adafruit on a Saturday, got it on a Wednesday. Took about two hours to get through a headless install of Raspbian [1], most of which was fighting with my Mac's Disk Utility.
Not knocking the BASIC Engine, I think it's cool as heck, just pointing out that getting started on RPi is not really as painful as it once was. You can even purchase an SD card preloaded with Raspbian!
A bit OT, but if your hassle with disk utility was related to imaging your card, I'd recommend https://etcher.io/ . It's an unbelievably simple and friendly tool.
I would guess they have injectors for the filling at the centers of those cells. A Voronoi edge is equidistant from the two points it bisects, so it kind of makes sense that this would happen naturally if the filling is injected at a constant rate.
I'd guess more likely that they are chocolate nozzles -- it seems more straightforward to me to produce a precise chocolate "cup", pour or place the filling inside of it, then pipe a chocolate "lid" onto the cup. Presumably the multiple nozzles of chocolate would help it to settle flatter faster.
Edit: there's a video on Facebook that covers the whole process in a minute. My hunch is partly right: the wrapper and chocolate cup are indeed completed first, then a circle of peanut butter is indeed placed in, then the thing is shaken to encourage that peanut butter to fill the space uniformly. However the chocolate "lid" is just plopped on as one wide dollop from a hose, and then blown out across the cup with compressed air: so the Voronoi cells probably come either from this blowing phase, or else the hose has some sort of "spreader" inside of it or so.
I've also written http://propertesting.com/, which I'm currently working to turn into a full book with Pragmatic Programmers (with Elixir translations included as well, so that everyone on the BEAM can benefit :) )
* Removal of Apache ZooKeeper as a dependency
* New consumer group protocol (KIP-848)
* Early access of Queues For Kafka (KIP-932)