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// data
{
    "_id" : ObjectId("5f4f03709f80fb9179d5136e"),
    "data1" : 1.0,
    "data2" : 2.0,
    "data3" : 3.0,
    "data4" : 4.0,
    "data5" : 5.0,
    "other" : {
        "data6" : 6.0,

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# spark-env.sh
export SPARK_DIST_CLASSPATH=$(hadoop classpath)

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=====================================
pseudo distribution
=====================================

# hadoop-env.sh
export JAVA_HOME=/home/hadoop/app/java

# core-site.xml
<configuration>
    <property>

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<?php // <?php is required

// helper

if (!function_exists('separator')) {
    function separator($tag = 'TAG')
    {
        echo '------------ ' . $tag . ' ------------' . PHP_EOL;
    }
}

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# directory & file
app // include Console, Events, Exceptions, Http (Controllers/Middleware), Jobs, Listeners, Models, Providers
bootstrap/app.php // instantiate lumen application
config // default: vendor/laravel/lumen-framework/config (include app.php, auth.php, logging.php ...)
public/index.php // there is a .htaccess in the same level
routes/web.php
vendor // dependencies
.env // after loaded, get by function env($key, $default = null)
artisan // #!/usr/bin/env php
composer.json // like npm package.json

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#define _GNU_SOURCE
#include <sys/wait.h>
#include <sys/wait.h>
#include <sched.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>

#define STACK_SIZE (1024 * 1024)

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# rvm
rvm list // list installed interpreters 
rvm list known // list available interpreters
rvm install <version> // install ruby interpreter
rvm use <version> // switch to specified ruby interpreter
rvm remove <version> // remove ruby interpreter (alias: delete)
rvm get <version> // upgrade rvm: stable, master
ls -al ~/.rvm/

# ruby

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# base
cri (container runtime interface)
cni (container network interface)
csi (container storage interface)
ipvs (ip virtual server)
oci (open container initiative)
nfs (network file system)
=> ref: https://zhuanlan.zhihu.com/p/33390023
=> ref: https://www.youtube.com/watch?v=Qw-6k95IBHU

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# .net standard
=> ref: https://github.com/dotnet/standard/blob/master/docs/versions.md
=> ref: https://github.com/dotnet/standard/tree/master/docs/versions

# .net framework
v4.8 is recommended
=> ref: https://dotnet.microsoft.com/download/dotnet-framework

# .net core
v3.1 is LTS

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[ApiController]
[Route("api/[controller]/[action]")]
public class AsyncController : ControllerBase
{
    [HttpGet]
    public async void Test()
    {
        Console.WriteLine("thread id: {0}", Thread.CurrentThread.ManagedThreadId);

        await new HttpClient().GetAsync("https://www.google.com/");