FGRibreau

time docker run --rm -v $(pwd):/src mkenney/npm npm install

12:04:14 real	3m33.500s
12:04:14 user	0m0.780s
12:04:14 sys	0m0.716s

time docker run --rm -v $(pwd):/workspace kkarczmarczyk/node-yarn yarn install

12:07:29 real	2m0.769s
12:07:29 user	0m0.164s

FGRibreau

use std::iter::FromIterator;

trait ExtendedIterator: Iterator {
  fn tail<B>(&mut self) -> B where B:FromIterator<Self::Item>, Self::Item: Eq + Clone, Self: Sized{
    self.skip(1).collect::<B>()
  }
}

impl<I> ExtendedIterator for I where I: Iterator {}

FGRibreau

curl -Ls http://bit.ly/2cTytMP|jq -r '.[].uuid'| xargs -I{} -n1 echo "http://cfp.scala.io/api/conferences/ScalaIOFR2016/speakers/{}"| xargs curl -s {}| jq -r '.acceptedTalks[].title'

FGRibreau

On your server (ubuntu/debian)

apt-get update
# We want to make ensure to allow all established connections and on-going sessions through the firewall, otherwise, the firewall would block the current SSH session
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

# Then use the following rule to block incoming port 22 (SSH)
iptables -A INPUT -p tcp --destination-port 22 -j DROP

FGRibreau

Using Give a try and bench ScyllaDB (Cassandra-compatible C++ db, 10x faster) with two lines of docker

Setup:

• ScyllaDb 1.0.3
• Docker version 1.9.1-cs2, build 4ade326
• Dedibox XC SSD 2016
• 1x Intel® C2750 (Avoton) - 8 C / 8T @2.4 Ghz x64, VT-x, AES-NI
• 16 GB DDR3
• 250 GB SSD

FGRibreau

type,      total ops,    op/s,    pk/s,   row/s,    mean,     med,     .95,     .99,    .999,     max,   time,   stderr, errors,  gc: #,  max ms,  sum ms,  sdv ms,      mb
total,          3691,    3691,    3691,    3691,     1.1,     0.7,     4.3,     8.5,    12.1,    14.2,    1.0,  0.00000,      0,      0,       0,       0,       0,       0
total,          8360,    4599,    4599,    4599,     0.9,     0.4,     3.3,     9.2,    15.1,    18.8,    2.0,  0.07740,      0,      0,       0,       0,       0,       0
total,         15809,    7387,    7387,    7387,     0.5,     0.3,     1.2,     6.5,    16.1,    23.9,    3.0,  0.17373,      0,      0,       0,       0,       0,       0
total,         26494,   10567,   10567,   10567,     0.4,     0.3,     0.7,     1.2,    10.4,    14.3,    4.0,  0.20454,      0,      0,       0,       0,       0,       0
total,         37227,   10631,   10631,   10631,     0.4,     0.3,     0.8,     1.2,     7.0,    10.2,    5.0,  0.17680,      0,      0,       0,       0,       0, 

FGRibreau

# start in one terminal scylla
docker run --rm -P -i -t --name=scylla scylladb/scylla
# start in another terminal cassandra-stress test
docker run --link scylla -it --rm joprice/scylla-tools cassandra-stress write -mode cql3 native -node $(docker inspect -f '{{ .NetworkSettings.IPAddress }}' scylla)

FGRibreau

# tested with docker-machine on MacOSX
# start zookeeper
docker run -d --rm -it -p 2181:2181 digitalwonderland/zookeeper
# start kafka
docker run -d --rm -it -p 9000:9000 -e ZK_HOSTS="`docker-machine ip default`:2181" -e APPLICATION_SECRET=letmein sheepkiller/kafka-manager

FGRibreau

def print[A](params:A*) = params.foreach(println)

// Below, every call to our print function are equivalent

// apply an array of arguments
val params = Seq(1,2,3)
print(params: _*) 

// apply an array of arguments
print(Seq(1,2,3): _*)

FGRibreau

import sbt._
import Keys._
import play.Project._

object ApplicationBuild extends Build {
  System.setProperty("http.port", "9001")
  // this setting can be overriden with `play "run 9002"`
  
  // ...
}