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MySQL Community Awards 2014 : Community Contributor of the year 2014

At Percona Live MySQL Conference & Expo (PLMCE), I had the honor to receive a MySQL Community Award for the "Community Contributor of the year 2014". I was so proud and still I am. This is the reason why I received it: Frederic organizes the MySQL & Friends Devroom at FOSDEM every year. He worked towards making a true community driven event participated by all key players. in 2014 the MySQL & Friends devroom also presented a shared booth/stand regrouping Oracle, MariaDB/SkySQL and Percona engineers and developers. But this Award can't be only mine, I need to share it with all people that helped me in this adventure and that makes it possible. FOSDEM MySQL & Friends Devroom is maybe now the second best event in Europe after Percona Live UK (PLUK). I'm sorry, "apologies upfront" (some people will understand this sentence), but I'll now thanks all the people that deserves it and the list is long: - FOSDEM, for the acceptance of the MySQL & Friends Devroom every year since 2009. - Kris sdog Buytaert, who encouraged me to give my first talk in the MySQL Devroom in 2010. - Lenz Grimmer, to have run the devroom at the beginning - Giuseppe @datacharmer Maxia, for having helped me and introduced me to key players in the Community to be able to create every year a strong Committee with people of different companies and opensource projects - Colin @bytebot Charles, for having participate to all these devrooms as visitor, speaker and committee member (and congratulation for the Award too) - Sergey Petrunia who also helped me the first year I was in charge of the devroom - Henrik @h_ingo Ingo, who was a model for me in how he represented the Open Source in the MySQL ecosystem (you can come back whenever you want) - Oracle, Tungsten, SkySQL, MariaDB, Percona to have allowed their engineers to travel, speak and share the booth with each others - All committee members - All speakers (2014, 2013,2012) - All attendees - and last but not least the Percona Belgian Team, Liz @lizztheblizz van Dijk, Dimitri @dim0 Vanoverbeke and Kenny @gryp Gryp who supported me for the logistic and organized a wonderful Community Dinner this year. Again thank you everybody, this award is our award to all of us !

Some talks and tutorials

Most of the slides can be found on my slideshare account and more recently on my SpeakerDeck page. 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2005

nolinger option for Galera Load Balancer (glb)

If you test Galera synchronous replication with Percona XtraDB Cluster or MariaDB Galera Cluster you must have tried to use a load balancer like HA Proxy or Galera Load Balancer. On very heavy load, you may have issue with a large amount of TCP in TIME_WAIT like this one: 
tcp        0      0 127.0.0.1:59035         127.0.0.1:3306          TIME_WAIT
This can lead to a TCP port exhaustion as explained on this post. On HA proxy since version 1.4.19, you can use the nolinger option also on TCP backends. This terminate the connection (TCP RST) as soon as the loadbalancer finished the communication. The counter part is that Aborted_clients status counter in MySQL increases with each connections' end. This counter becomes then useless. This option is not available on glb (with -l parameter) if you apply the patch attached to this post. I provide also rpm package with the patch applied : 
Name        : glb
Version     : 0.9.2
Release     : 2
Architecture: x86_64
Install Date: (not installed)
Group       : Productivity/Networking/Routing
Size        : 208489
License     : GNU General Public License version 2 or later (GPL v2 or later)
Signature   : (none)
Source RPM  : glb-0.9.2-2.src.rpm
Build Date  : mer 27 fév 2013 17:15:54 CET
Build Host  : percona1
Relocations : (not relocatable)
URL         : http://www.codership.com/products/galera-load-balancer
Summary     : TCP Connection Balancer
Description :
glb is a simple user-space TCP connection balancer made with scalability and
performance in mind. It was inspired by pen, but unlike pen its functionality
is limited only to balancing generic TCP connections.

Features:
* list of backend servers is configurable in runtime.
* supports server "draining", i.e. does not allocate new connections to server,
  but does not kill existing ones, waiting for them to end gracefully.
* on Linux 2.6 and higher glb uses epoll API for ultimate performance.
* glb is multithreaded, so it can utilize multiple CPU cores. In fact even on a
  single core CPU using several threads can significantly improve performance
  when using poll()-based IO.
* connections are distributed proportionally to weights assigned to backend
  servers.
* this is a patched version providing SO_LINGER
Example: 
[root@macbookair ~]# glbd -K -l --threads 6 --control 127.0.0.1:4444 127.0.0.1:3308 127.0.0.1:3306
glb v0.9.2 (epoll)
Incoming address:       127.0.0.1:3308 , control FIFO: /tmp/glbd.fifo
Control  address:        127.0.0.1:4444 
Number of threads: 6, max conn: 493, policy: 'least connected', top: NO, nodelay:
 ON, keepalive: OFF, defer accept: OFF, verbose: OFF, linger: ON, daemon: NO
Destinations: 1
   0:       127.0.0.1:3306 , w: 1.000
Router:
------------------------------------------------------
        Address       :   weight   usage    map  conns
      127.0.0.1:3306  :    1.000   0.000    N/A      0
------------------------------------------------------
Destinations: 1, total connections: 0 of 493 max

Pool: connections per thread:     0     0     0     0     0     0
If you test it please post a comment.

As MySQL Community Manager, I am an employee of Oracle and the views expressed on this blog are my own and do not necessarily reflect the views of Oracle.

You can find articles I wrote on Oracle’s blog.

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