zouzias

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

zouzias

1 ) Install nagios on Ubuntu using the following guide.

https://help.ubuntu.com/lts/serverguide/nagios.html

2) Install the Jmeter and Tomcat Plugin from nagios exchange.


http://exchange.nagios.org/directory/Plugins/Java-Applications-and-Servers/Apache-Tomcat/check_tomcat-2Epl/details

zouzias

#Delete local tags.
git tag -l | xargs git tag -d
#Fetch remote tags.
git fetch
#Delete remote tags.
git tag -l | xargs -n 1 git push --delete origin
#Delete local tasg.
git tag -l | xargs git tag -d

zouzias

# 1) Copy namefile.csv into HDFS
hadoop fs -put /path/on/localsystem /path/to/hdfs
    
# Start Hive shell . Just type hive
hive

# in your shell
# 2) Create table and show it.
  
create table example1(name String, address String, price int) row format delimited fields terminated by ',' ESCAPED BY '\\' stored as textfile;

zouzias

#!/bin/bash

# Check md5 from all files in a dir. It assumes that for each file "filename.txt" there exists a "filename.txt.md5" corresponding file

FILES=`ls *`
for f in $FILES
do
        # echo "Processing $f"
        MD5=`md5 $f`
        TRUE_MD5=`cat $f.md5`

zouzias

# Recipe for scala-2.10.0-RC5
 
require 'formula'
 
 
class ScalaCompletion < Formula
  homepage 'http://www.scala-lang.org/'
  url 'https://raw.github.com/scala/scala-dist/27bc0c25145a83691e3678c7dda602e765e13413/completion.d/2.9.1/scala'
  version '2.9.1'
  sha1 'e2fd99fe31a9fb687a2deaf049265c605692c997'

zouzias

#!/usr/bin/env ruby

require 'nokogiri'
require './xml_parser.rb'

file="dblp.xml"

Xml::Parser.new(Nokogiri::XML::Reader(open(file))) do
  inside_element 'article' do
    for_element 'author' do puts "Author: #{inner_xml}" end

zouzias

# Generic Aliases
alias ll='ls -latr'                                          # List all file in long list format by modification time
alias ..='cd ..'                                             # Go up one directory
alias ...='cd ../..'                                         # Go up two directories
alias ....='cd ../../..'                                     # Go up three directories
alias -- -='cd -'                                            # Go back
alias c='clear'                                              # Clear Screen
alias k='clear'                                              # Clear Screen
alias cls='clear'                                            # Clear Screen
alias _="sudo"                                               # Execute with sudo

zouzias

# Summary of HDFS filesystem
sudo su hdfs -c "hdfs dfsadmin -report"

# Check the HDFS filesystem (detail block file)
sudo su hdfs -c "hdfs fsck / -files -blocks"

zouzias

> wget dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
> rpm -ivh epel-release-6-8.noarch.rpm
> yum install nrpe nagios-plugins-all openssl
  
  Then go to '/etc/nagios/nrpe.cfg '
  
  and update the 
  
  allowed_hosts=nagios.change_me.com