This document discusses the history and capabilities of Q4M, an open-source message queue plugin for MySQL. It was created in 2008 by Cybozu to provide a robust, fast messaging system accessible via SQL. Major Japanese companies like DeNA, Livedoor and Mixi use Q4M for asynchronous communication between services. The document also covers related projects like Mycached, a memcached-like plugin, and HandlerSocket, which improves MySQL request handling performance.
SophiaConf2010 Présentation des Retours d'expériences de la Conférence du 08 ...TelecomValley
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SquirrelMail is a project that provides both a web-based email client and a proxy server for the IMAP protocol.It supports IMAP and SMTP protocols and can be set up to
support a wide range of MTA and implementations.
Continues to have features support in plugins including
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It has a light interface because it’s written in PHP.
To configure SquirrelMail the pre-requirements are-
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SophiaConf2010 Présentation des Retours d'expériences de la Conférence du 08 ...TelecomValley
SophiaConf2010 Présentation des Retours d'expériences de la Conférence du 08 Juillet - HTML 5, une plateforme contemporaine pour le Web : Stefano Crosta, Chief Technical Officer de SLICE FACTORY ; Raphaël Troncy, Maître de Conférences à Eurecom.
Kea DHCP – the new open source DHCP server from ISCMen and Mice
This webinar will highlight the differences between the old ISC DHCP and new Kea DHCP (database support, dynamic reconfiguration, performance wins, scripting hooks) and will showcase the Men & Mice Suite as a graphical front-end to both ISC DHCP and Kea to ease the migration.
SquirrelMail is a project that provides both a web-based email client and a proxy server for the IMAP protocol.It supports IMAP and SMTP protocols and can be set up to
support a wide range of MTA and implementations.
Continues to have features support in plugins including
password change and server-side filters.
It has a light interface because it’s written in PHP.
To configure SquirrelMail the pre-requirements are-
-> SMTP server(Postfix)
-> Web server(HTTP)
-> DNS server(BIND)
-> Dovecot server
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Facebook e' uno dei piu' grandi siti nel mondo, con datacenter e POP in giro per il mondo, e una grande quantita' di macchine.
In questo talk useremo DHCP come un esempio per discutere perche' e' buono progettare sistemi stateless e discutere la sottile linea di separazione tra utilizzare un prodotto OpenSource o prendere un approccio "Not Invented here".
Realtime applications with EmberJS and XMPPrjvegasf
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Вебинары сегодня используются для преподавания. Они представляют собой новую, интерактивную форму взаимодействия преподаватель - студент, которая вписывается в новую парадигму высшего образования в России.
Let's see improvement in ASP.NET MVC 3 about Javascript and Ajax that covers unobtrusive javascript, JSON binding, and especially we will talk deeper about data validation that everyone must be involved. In ASP.NET MVC 3 we can make validation more simpler and better by Model Validation and Remote Validation.
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LS11 SHOW202 - Enterprise 2.0 Hero - a Beginner's Guide to Installing IBM Lot...Stuart McIntyre
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No smoke, no mirrors. You'll go away with all the materials needed to install Lotus Connections 3.0 from scratch, and become Enterprise 2.0 heroes!
The Lotus Connections install process keeps improving with each release, introducing new wizards, reducing prerequisite steps, making the process more robust and Lotus Connections 3.0 goes a step further by using the new Installation Manager technology.
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Unikraft: Fast, Specialized Unikernels the Easy WayScyllaDB
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https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
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Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
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9. What is Q4M?
A message queue
runs as a storage plugin of MySQL 5.1
Why is it a MySQL plugin?
accessible by using existing MySQL clients
no need for a new client library
administrable by using SQL
friendly to DB admins
First release: Jan 2008
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10. Design Goals of Q4M
Robust
Does not lose data on OS crash or power failure
necessary for Tokyo wo. nuclear power plants… orz
Fast
Transfer thousands of messages per second
Easy to Use
Use SQL for access / maintenance
Integration into MySQL
no more separate daemons to take care of
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11. Users of Q4M
Many leading web services in Japan
DeNA Co., Ltd.
livedoor Co., Ltd.
mixi, Inc.
Zynga Japan (formerly Unoh, Inc.)
2011 7 16 11
13. What is a Message Queue?
Middleware for persistent asynchronous
communication
communicate between fixed pairs (parties)
a.k.a. Message Oriented Middleware
MQ is intermediate storage
RDBMS is persistent storage
Senders / receivers may go down
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14. Minimal Configuration of a Message Queue
Senders and receivers access a single
queue
Sender Receiver
Queue
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15. Using MQ as a Relay
Separate queue for sender and receiver
Messages relayed between queues
Relay
Sender Receiver
Queue Queue
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16. Merits of using Message Relays
Destination can be changed easily
Relays may transfer messages to different
locations depending on their headers
Robustness against network failure
no loss or duplicates when the relay fails
Logging and Multicasting, etc.
2011 7 16 16
17. Message Brokers
Publish / subscribe model
Separation between components and their
integration
Components read / write to predefined queues
Integration is definition of routing rules between
the message queues
Messages are often transformed (filtered) within
the relay agent
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18. What about Q4M?
Q4M itself is a message queue
Can connect Q4M instances to create a
message relay
Provides API for creating message relays
and brokers
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19. Performance of Q4M
over 7,000 mess/sec.
message size: avg. 512 bytes
syncing to disk
Outperforming most needs
if you need more, just scale out
Can coexist with other storage engines without
sacrificing their performance
see http://labs.cybozu.co.jp/blog/kazuhoatwork/2008/06/q4m_06_release_and_benchmarks.php
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20. Q4M in DeNA
uses Q4M for sending notifications
asynchronously
http://engineer.dena.jp/2010/03/dena-technical-
seminar-1-2.html
2011 7 16 20
21. Q4M in DeNA
Q4M
2,000 /
DeNA
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