Krishna Vangapandu krishnabhargav
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| libraryDependencies ++= Seq( | |
| "org.atmosphere" % "atmosphere-runtime" % "1.0.4", | |
| "org.atmosphere" % "nettosphere" % "2.1.9") | |
| resolvers += "Sonatype OSS Snapshots" at "http://oss.sonatype.org/content/repositories/snapshots/" | |
| resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/" |
krishnabhargav
/ websockettestclient.html
Created
November 12, 2014 13:48
simple web socket test client
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| <!DOCTYPE html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="UTF-8"> | |
| <script type="text/javascript"> | |
| var socket = new WebSocket("ws://localhost:8080/echo"); | |
| socket.onopen = function () { | |
| console.log("Connected"); | |
| socket.send('hello, world!'); |
krishnabhargav
/ monad-examples.lhs
Last active
August 29, 2015 14:10
monad examples that helped me understand .. in haskell
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| Functor & Fmap. | |
| --------------- | |
| Lets start with fmap. fmap is defined in a Functor. | |
| fmap takes a function and a box. | |
| fmap then extracts the content from the box, | |
| applies the function on the content and puts the result back into the box. | |
| The signature of the fmap is | |
| > fmap :: Functor f => (a -> b) -> f a -> f b |
krishnabhargav
/ spark-sql-people.scala
Created
November 22, 2014 02:25
Spark SQL example ... beautiful...
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| val sqlContext = new org.apache.spark.sql.SQLContext(sc); //sc is SparkContext | |
| import sqlContext._ | |
| case class Person(name: String, age: Int) | |
| val randomPeople = sc.parallelize(1 to 1000).map(i => Person("Yu_"+i,i)) | |
| randomPeople.registerAsTable("people") | |
| val aged30 = sql("select * from people where age = 30") |
krishnabhargav
/ TypeInferenceLambda.fs
Created
January 25, 2015 16:30
type inference in F# starts from left to right and top to bottom. So if you do not use |> operator, then type annotations in lambda expression will be required.
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| let sizeOfFolder folder = | |
| let allFiles = Directory.GetFiles(folder, "*.*", SearchOption.AllDirectories) | |
| let fileInfos = allFiles |> Array.map (fun x -> new FileInfo(x)) | |
| let allSizes = fileInfos |> Array.map (fun x -> x.Length) | |
| Array.sum allSizes | |
| ///This version requires explicit type annotations in the lambda | |
| let sizeOfFolder2 folder = | |
| let allFiles = Directory.GetFiles(folder, "*.*", SearchOption.AllDirectories) | |
| let fileInfos = Array.map (fun (x:string) -> new FileInfo(x)) allFiles |
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| let rec gcd a b = match (a,b) with | |
| | (x,y) when x = y -> x | |
| | (x,y) when x > y -> gcd (x-y) y | |
| | (x,y) -> gcd x (y-x) | |
| let lcm a b = a*b/(gcd a b) |
krishnabhargav
/ gist:c6ce1611be46636d62d0
Created
February 24, 2015 01:49
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| src/Unit-1/DoThis master ✗ 23h17m ◒ | |
| ▶ ls -l | |
| total 7456 | |
| -rw-r--r-- 1 bhargava staff 182 Feb 23 08:16 App.config | |
| -rw-r--r-- 1 bhargava staff 1140 Feb 23 08:16 ConsoleReaderActor.cs | |
| -rw-r--r-- 1 bhargava staff 1092 Feb 23 08:16 ConsoleWriterActor.cs | |
| -rw-r--r-- 1 bhargava staff 1530 Feb 23 08:16 Program.cs | |
| drwxr-xr-x 3 bhargava staff 102 Feb 23 08:16 Properties | |
| -rw-r--r-- 1 bhargava staff 2595 Feb 23 08:16 WinTail.csproj | |
| -rw-r--r-- 1 bhargava staff 960 Feb 23 08:16 WinTail.sln |
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| learning/hello-paket/HelloPaket master ✗ 103d ✖ ⚑ ◒ | |
| ▶ wget https://github.com/fsprojects/Paket/releases/download/0.30.3/paket.bootstrapper.exe | |
| --2015-02-23 21:20:58-- https://github.com/fsprojects/Paket/releases/download/0.30.3/paket.bootstrapper.exe | |
| Resolving github.com... 192.30.252.131 | |
| Connecting to github.com|192.30.252.131|:443... connected. | |
| HTTP request sent, awaiting response... 302 Found | |
| Location: https://s3.amazonaws.com/github-cloud/releases/22755810/f2133dfe-bb80-11e4-9f9d-f777da134aed.exe?response-content-disposition=attachment%3B%20filename%3Dpaket.bootstrapper.exe&response-content-type=application/octet-stream&AWSAccessKeyId=AKIAISTNZFOVBIJMK3TQ&Expires=1424744518&Signature=v8wt6BYpfl2y0QOeTkmPQe18xUE%3D [following] | |
| --2015-02-23 21:20:58-- https://s3.amazonaws.com/github-cloud/releases/22755810/f2133dfe-bb80-11e4-9f9d-f777da134aed.exe?response-content-disposition=attachment%3B%20filename%3Dpaket.bootstrapper.exe&response-content-type=application/octet-stream&AWSAccess |
krishnabhargav
/ MethodConstraints.fs
Created
May 20, 2015 02:06
F# Method Constraints .. multiple ones
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| let inline recordMetrics< ^T when ^T : (member MessageCountDetails : MessageCountDetails) | |
| and ^T : (member Path : string)> (all : ^T seq) = | |
| recordMetricsForPath (fun e -> (((^T : (member Path : string) e)))) all |
krishnabhargav
/ Distributed Systems
Last active
January 21, 2025 17:37
Some Questions on Distributed systems -> https://twitter.com/SeanTAllen/status/613135036716568576
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| 1) explain the life of an http request. | |
| 2) what does the FLP result teach us? | |
| 3) what is a byzantine failure? | |
| 4) explain CRDTs | |
| 5) explain linearizability. | |
| 6) how does DNS work? | |
| 7) crash-stop vs crash-recovery? | |
| 8) difference between soft and hard real time | |
| 9) model GC in an eventually consistent system | |
| 10) discuss clock skew, NTP, and AWS vs metal |