HANDLERSOCKET - A NOSQL PLUGIN FOR MYSQL

Jui-Nan Lin @OSDC.TW 2011

About this talk & me

URL of this Slide:

http://0rz.tw/jqQqY QRCode: About me:

Jui-Nan Lin (jnlin) Developer @

www.pixnet.net Twitter: @jnlin Github: jnlin

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What is HandlerSocket?

“A NoSQL interface for MySQL” Only supports queries which use index Developed by DeNA (a Japanese social

gaming provider) https://github.com/ahiguti/HandlerSocket

-Plugin-for-MySQL

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Architecture4

libmysql libhsclient

Application (Ex. PHP, Ruby, Perl …)

Listener for libmysql

SQL Layer

Handler Interface

InnoDB MyISAM Other storage engines

HandlerSocket Plugin

application

mysqld

Reference: http://www.slideshare.net/akirahiguchi/handlersocket-plugin-for-mysql-4664154

NoSQL for Web Application

Most operations in web application are simple CRUD.

RDBMS is too powerful for web application.

Typical solution: Memcached + MySQL Cassandra Apache CouchDB Amazon SimpleDB

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NoSQL for Web Application

Pros: Scalable Fast

Cons: Unstable

Twitter drops Cassandra in 2010: http://engineering.twitter.com/2010/07/cassandra-at-twitter-today.html

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HandlerSocket for MySQL

MySQL is very stable HandlerSocket provides a NoSQL

interface for MySQL HandlerSocket is very fast. Faster than

MySQL.

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How fast is it

750,000 qps on a commodity server (tested by original developers) MySQL 5.1 + E5540 2.53Ghz + 32 GB RAM All data fits in memory All Clients are written in C 100,000 qps with Original MySQL

About 7.5x faster than original MySQL!

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How fast is it

1m PK SELECT queries each test on 1 table contains 1m rows. Client is written in PHP. SELECT * from table1 WHERE pk = ?

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Concurrent Connections

1 10 50 100

HandlerSocket

Time (sec)

256 28 15 13

QPS 3906 35714 66667 76923

MySQL

Time (sec)

372 83 87 85

QPS 2688 12048 11494 11765

Why HandlerSocket is fast10

from http://yoshinorimatsunobu.blogspot.com/2010/10/using-mysql-as-nosql-story-for.html

Why HandlerSocket is fast

HandlerSocket do not need to do: Parsing SQL Statements Opening, locking table Making SQL execution plans

Index usage Unlocking, closing tables

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Why HandlerSocket is fast

HandlerSocket does do: Plain text-based protocol Keep table open for reuse Event based (use epoll)

Many Connection per MySQL thread Accept only index queries

Support range query, LIMIT, multi_get operations

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Language Bindings

PHP: php-handlersocket Java: hs4j Python: python-handler-socket Ruby: ruby-handlersocket Perl: Net::HanderSocket

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Programming Example

PHP Read Operation Port used for write operation is different

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Configuration (my.cnf)

handlersocket_port = 9998 Port for reading

handlersocket_port_wr = 9999 Port for writing

handlersocket_threads = 16 No. of reader threads Recommended Value: # of CPUs

handlersocket_threads_wr = 1 No. of writer threads

open_files_limit = 65535

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Pros and Cons

Pros Stable High Performance Support a lot of query types No duplicate cache (compared with MySQL

+ memcached) Invalidation Problem

Flexible Support SQL interface. We can still use SQL

statements! (ex. report generating) Write binlog and support MySQL replication.

Included in Percona Server

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Pros and Cons

Cons No Security

Without username and password Do not update MySQL Query Cache

Fixed in recent commits No “INSERT … ON DUPLICATED KEY

UPDATE …” Feature Do not support auto increment column

while inserting Fixed in recent commits

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Q&A

Thank you!

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