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Big ”Master”Data
Masahiro Nagano
@kazeburo
PHP BLT#1
LT but Me
• Masahiro Nagano
• @kazeburo
• Site Reliability Engineer at Mercari, inc.
• ISUCON芸人
• a PHP newbie
What is Master Data?
“Master”Data
items
id
name
description
shipping_payer
shipping_method
condition
category_id
brand_id
...
payer
id
name
created
updated
...
method
id
name
created
updated
...
id
name
created
updated
...
condition
categories
id
name
disp_order
parent_id
created
updated
...
brands
id
name
disp_order
pronunciation
created
updated
...
Some time Master
Data cause N+1
• SELECT with JOIN
• Cache in File/Memory/Memcached
• Embed in PHP source code
Master Data we thought
array(
1 => array(
'id' => '1',
'created' => '2014-07-16 03:30:27',
'updated' => '2014-07-16 03:30:27',
'name' => 'Buyer',
'display_order' => '2',
),
2 => array(
'id' => '2',
'created' => '2014-07-16 03:30:27',
'updated' => '2014-07-16 03:30:27',
'name' => 'Seller',
'display_order' => '1',
),
);
Big Master Data
$ ls -lh
2.0M item_brands_master.php
509K item_categories_master.php
BMD is Heavy
$ cat bench.php
<?php
$time_start = microtime(true);
require_once '/item_brands_master.php';
$time_end = microtime(true);
$time = ($time_end - $time_start);
echo "#1 in $time secn";
$ php bench.php
#1 in 0.071656942367554 sec
“Use OPcache!!”
you say
How OPcache works
Process
shared mem
Copy!
Destroy!!
empty
full
php
php
php
php
php
php
DB
API
php
php
php
Request
Response
5-10 msec to load
a 2.0MB php
from shared memory
According to strace/benchmark
sorry missed logs
Find way to reduce
file size
TSV!
split the line and create
an array on demand
Example
public static $keys = array (
0 => 'id',
1 => 'created',
2 => 'updated',
3 => 'name_ja',
4 => 'name_en',
5 => 'alternate_string',
6 => 'initials',
7 => 'display_order',
8 => 'is_deleted',
);
public static $rows = array (
1 => '1 2014-07-16 03:30:27 2014-07-16 03:30:27 104+ Octane
Boost 104+ Octane Boost 1 50 no',
2 => '2 2014-07-16 03:30:27 2014-07-16 03:30:27 20/10
Products 20/10 Products 2 50 no',
3 => '3 2014-07-16 03:30:27 2014-07-16 03:30:27 303 Products
303 Products 3 50 no',
4 => '4 2014-07-16 03:30:27 2014-07-16 03:30:27 3.1 Phillip
Lim 3.1 Phillip Lim 3 50 no',
File Size
$ ls -lh
2.0M item_brands_master.php
660K item_brands_master.php
require_once 70msec => 7msec (without OPCache)
Benchmarkfunction get($master, $id)
{
return $master::$rows[$id];
}
function get2($master, $id)
{
return array_combine($master::$keys,
explode("t",$master::$rows[$id]));
}
$time_start = microtime(true);
for ( $i=1; $i<3000; $i++ ) {
$val = get("ItemBrandsMaster",$i);
}
$time = 3000/(microtime(true) - $time_start);
echo "#1-2 in $time get/secn";
$time_start = microtime(true);
for ( $i=1; $i<3000; $i++ ) {
$val = get2("ItemBrandsMaster2",$i);
}
$time_end = microtime(true);
$time = 3000/(microtime(true) - $time_start);
echo "#2-2 in $time get/secn";
Result
$ php bench.php
#1-2 in 1374881.1188811 get/sec
#2-2 in 355409.33227884 get/sec
Seems Big speed down, but keeps fast enough.
Does not impact real application
Has been in production
END

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