mumrah
Joined 18 years ago
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438
Submissions
144
Member since
Jan 13
Recent submissions
Comment · 1 year ago
Comment · 1 year ago
Not for long. An early access version of KIP-932 Queues for Kafka will be released in 4.0 in a few weeks.
https://cwiki.apache.org/confluence/display/KAFKA/KIP-932%3A...
Comment · 5 years ago
Part of the new design is that brokers and controllers can be run on separate JVMs.
Comment · 6 years ago
Under 100 for radio and TNC, sure. See the NinoTNC http://tarpn.net/t/nino-tnc/n9600a/n9600a_info.html. For radios we use second-hand commercial radios that we reprogram for Ham use.
However, coax and antenna can easily exceed 100 alone.
Comment · 6 years ago
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.
BBS is also a pretty common application.
Comment · 6 years ago
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.
Comment · 7 years ago
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).
Comment · 8 years ago
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!
1. https://learn.adafruit.com/raspberry-pi-zero-creation/overvi...
Comment · 8 years ago
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.
Comment · 8 years ago
If you like this, I recommend checking out Learn You Some Erlang (for great good) http://learnyousomeerlang.com/content
Comment · 9 years ago
It's for sale on Amazon: https://www.amazon.com/Calculus-Made-Easy-Silvanus-Thompson/...
Comment · 10 years ago
Cheapest? A Chinese radio off Amazon, e.g., https://www.amazon.com/BaoFeng-UV-5R-Dual-Radio-Black/dp/B00.... This will allow you to tune in to local repeaters and listen. N.B., you cannot legally transmit without a license which is easy and cheap to obtain http://www.arrl.org/getting-licensed.
After getting licensed, you'll probably get frustrated with the UV-5R and look into a more capable hand held unit, or a mobile radio. These start at around $150 and go up from there (plus antennas, power supplies, etc).
Comment · 10 years ago
Was this done using the DVDs? I'm curious about any potential licensing issues with the screen caps and subtitles. Did you have to get permission/sign something - or does this fall under fair use?
* Removal of Apache ZooKeeper as a dependency
* New consumer group protocol (KIP-848)
* Early access of Queues For Kafka (KIP-932)