hanvari

<?php

function DownloadFile($file) {
  if (file_exists($file)) {
      header('Content-Description: File Transfer');
      header('Content-Type: application/octet-stream');
      header('Content-Disposition: attachment; filename='.basename($file));
      # header('Content-Transfer-Encoding: binary');
      header('Expires: 0');
      header('Cache-Control: must-revalidate');

hanvari

<?php

/*
  Reference: 
  http://code.tutsplus.com/tutorials/why-you-should-be-using-phps-pdo-for-database-access--net-12059
*/


function connect(){
  /* 

hanvari

SET FOREIGN_KEY_CHECKS=0;
truncate table schema.table ;
SET FOREIGN_KEY_CHECKS=1;

hanvari

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/elcapitaninstaller --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app –nointeraction

hanvari

javascript:(function({
  var INSTAPAPER=true,w=window,d=document,pageSelectedTxt=w.getSelection?w.getSelection():(d.getSelection)?d.getSelection():(d.selection?d.selection.createRange().text:0),pageTitle=d.title,pageUri=w.location.href,tmplt="";
  tmplt="From ["+pageTitle+"]("+pageUri+"):\n\n";
  if(pageSelectedTxt!="") {
    pageSelectedTxt=">%20"+pageSelectedTxt;
    pageSelectedTxt=pageSelectedTxt.replace(/(\r\n|\n+|\r)/gm,"\n");
    pageSelectedTxt=pageSelectedTxt.replace(/\n/g,"\n>%20\n>%20");
    w.location.href="nvalt://make/?txt="+encodeURIComponent(tmplt+pageSelectedTxt)+"&title="+encodeURIComponent(pageTitle)
  }
  else {

hanvari

#Apache Hadoop Quick Start Guide

This content was originally prepared for the course CMPUT 681 - Parallel and Distributed Systems at the University of Alberta (Fall 2016):
https://www.ualberta.ca/computing-science/graduate-studies/course-directory/courses/parallel-and-distributed-systems

Installing Hadoop on a cluster

Manual Installation on RAC (OpenStack) Cluster:

Obtain latest stable Hadoop release: https://hadoop.apache.org/releases.html

hanvari

We could simply set the SIGCHLD signal to be handled by SIG_IGN (ignored), and based on POSIX.1-2001 it will clean up the terminated child process.

struct sigaction sa;
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGCHLD, &sa, 0) == -1) {
  perror(0);
  exit(1);
}

hanvari

git fetch --all
git reset --hard origin/master
git pull origin master

hanvari

git clone git@github.com:Benjamin-Dobell/Heimdall.git
cd Heimdall
mkdir build
cd build
cmake -DDISABLE_FRONTEND=ON -DCMAKE_BUILD_TYPE=Release ..
LIBRARY_PATH=/usr/local/lib make


#References:
#https://raw.githubusercontent.com/Benjamin-Dobell/Heimdall/master/Linux/README

hanvari

#reading 1000 random 4k blocks from first 16GB of a disk

time for i in `seq 1 1000`; do
    dd bs=4k if=/dev/sda count=1 skip=$(( $RANDOM * 128 )) >/dev/null 2>&1;
done

#References:
# https://unix.stackexchange.com/questions/65595/how-to-know-if-a-disk-is-an-ssd-or-an-hdd
# https://serverfault.com/questions/551453/how-do-i-verify-that-my-hosting-provider-gave-me-ssds/551495#551495