npearce

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start

srinath-imaginea

When we read about Nodejs on the web, everybody start to say "In Node, everything runs in parallel except your code". We have hard time understanding this. What runs in parallel and what not? How does node gets additional thread to run something in parallel ? Who manages these threads? Once we get into a situation, where we have more than one thread, how does node achieve synchronization over the shared objects?

So this is a slightly tricky part of understanding Node's architecture. For all purposes, Node.js is single threaded and runs in a single process. That is the code you type is executed in a single thread. So if you do a while(block for 1 second), the entire process will be blocked. But this obviously isn't performant - if you have a couple of I/O requests to process for each HTTP request, it will block all further execution until that is complete.

Here is where node's async bit comes into play. For everything that is I/O intensive, Node.js automagically executes it in the background us

ylegall

import java.util.Iterator;

public class Iterators<T> implements Iterator<T> {

    private Iterator<T> current;
    private Iterator<Iterator<T>> cursor;

    public Iterators(Iterable<Iterator<T>> iterators) {
        if (iterators == null) throw new IllegalArgumentException("iterators is null");
        this.cursor = iterators.iterator();

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

dperini

//
// Regular Expression for URL validation
//
// Author: Diego Perini
// Created: 2010/12/05
// Updated: 2018/09/12
// License: MIT
//
// Copyright (c) 2010-2018 Diego Perini (http://www.iport.it)
//