broadcast

问题 I am using Spark 2.4.1 with Java 8 in my project. I have a scenario where I need to look-up another table/dataset which has two fields i.e. country-name and country-code. Another stream-data will have country-code column in it, I need to map respective country-name in the target/result dataframe. As far as I know, we can use join to achieve the above, using broadcast variable and joining. So from performance point of view which one is better here? What is the spark standard to handle this

问题 I know ValueError question has been asked many times. I am still struggling to find an answer because I am using inverse_transform in my code. Say I have an array a a.shape > (100,20) and another array b b.shape > (100,3) When I did a np.concatenate , hat = np.concatenate((a, b), axis=1) Now shape of hat is hat.shape (100,23) After this, I tried to do this, inversed_hat = scaler.inverse_transform(hat) When I do this, I am getting an error: ValueError: operands could not be broadcast together

问题 Background I already know how to put a shortcut to an app globally: Intent shortcutIntent=new Intent(); shortcutIntent.setComponent(new ComponentName(packageName,fullPathToActivity)); final Intent putShortCutIntent=new Intent(); putShortcutIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT,shortcutIntent); //... <=preparing putShortcutIntent with some customizations (title, icon,...) putShortcutIntent.setAction("com.android.launcher.action.INSTALL_SHORTCUT"); context.sendBroadcast(putShortcutIntent

问题 I'm working on a small, networked game prototype which will be played on LANs using UDP. For the discovery of other computers on the network, I've been investigating broadcasting. However, I'm still unsure about a few details regarding UDP socket setup/usage (networking newbie). I found a good library to use after the game is started, but at first, all computers running the game must be discovered and one has to be chosen as a server. So my questions are the following: Can a single UDP socket

问题 I've tried these phones: Motorolla Backflip 1.5, Nexus One 2.1 Basically I register BroadcastReceiver to get ACTION_HEADSET_PLUG broadcast and look on 3 extras that come in intent: state name microphone Here is the description from API: * state - 0 for unplugged, 1 for plugged. * name - Headset type, human readable string * microphone - 1 if headset has a microphone, 0 otherwise Issue #1: Broadcast comes when activity is started (not expected), when screen rotation happens (not expected) and

问题 I'm trying to find a simple solution for high-performance broadcast/multicast communication between unprivileged processes running on a Linux host. I'm looking for a solution that is 1) simple, 2) unprivileged (no root), 3) language-independent, 4) packet-oriented and 5) efficient (Gbit/s and up). To put this in context, my existing code simply uses UDP sockets for unicast communication, which neatly matches the above requirements (except being unicast). I've looked into expanding this to

问题 I have a Linux application that opens a UDP socket and binds it to a port. I haven't had any problem sending unicast packets through the socket. I had occasion to send a broadcast packet, so I enabled SO_BROADCAST, which allowed the broadcast packets to pass, but then I noticed that the unicast packets were being broadcast as well. Is this expected behaviour for a UDP socket, or is it more likely that I've misconfigured something? 回答1: From what I understand SO_BROADCAST is a socket option.

问题 on a broadcast I want to call a non static method from Service XYZ. The Service is start by the receiver on boot. Has someone a idea to run methods from this running service? One solution in this forum is to make the method static and use a singleton pattern to execute. But is there another method? Maybe with a binder? //EDIT for example i have the following clases: public class MyService extends Service{ ..... public void method(){ //TODO } } public class MyBroadcastReceiver extends

问题 I found this link https://gist.github.com/BenFradet/c47c5c7247c5d5d0f076 which shows an implementation where in spark, broadcast variable is being updated. Is this a valid implementation meaning will executors see the latest value of broadcast variable? 回答1: The code you are referring to is using Broadcast.unpersist() method. If you check Spark API Broadcast.unpersist() method it says "Asynchronously delete cached copies of this broadcast on the executors. If the broadcast is used after this

问题 How can I turn the sceen on ? I tried something like this adb -d shell am broadcast -a android.intent.action.SCREEN_ON It really should work, I send broadcast intent it is received by the system, but the screen doesn't turn on I do not understand what is the problem, is it possible to turn the screen of the device by code ? I mean with software ? Cause it seems like the turning on of the screen is done just by the hardware button press . . . at least I got that felling , am I wrong ? 回答1: I