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LiveJournal's Backend A history of scaling.PDF
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LiveJournal's Backend A history of scaling.PDF
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LiveJournal's Backend
A history of scaling
August 2005
Brad Fitzpatrick
brad@danga.com
danga.com / livejournal.com / sixapart.com
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License. To
view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/1.0/ or send a letter to
Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
http://www.danga.com/words/
LiveJournal Overview
●
college hobby project, Apr 1999
–
“blogging”, forums
–
social-networking (friends)
–
aggregator: “friend's page”
●
Built on Open Source
●
All Open Source itself
●
Rapid growth
–
April 2004: 2.8 million accounts
–
April 2005: 6.8 million accounts (Aug: 7.9M)
●
several thousands of hits/second
●
lots of MySQL
●
lots of custom (open source) infrastructure
http://www.danga.com/words/
Dropping names
●
Wikipedia
●
Slashdot
●
Sourceforge
●
Meetup
●
HowardStern.com
●
Facebook
●
GUBA (large “content” site)
●
parts of Perl.com?
●
new qpsmptd
●
...
http://www.danga.com/words/
LiveJournal Backend: Today
Roughly.
User DB Cluster 1
uc1a
uc1b
User DB Cluster 2
uc2a
uc2b
User DB Cluster 3
uc3a
uc3b
User DB Cluster 4
uc4a
uc4b
User DB Cluster 5
uc5a
uc5b
Memcached
mc4
mc3
mc2
mc12
...
mc1
mod_perl
web4
web3
web2
web50
...
web1
BIG-IP
bigip2
bigip1
perlbal (httpd/proxy)
proxy4
proxy3
proxy2
proxy5
proxy1
Global Database
slave1
master_a master_b
slave2 ... slave5
MogileFS Database
mog_a mog_b
Mogile Trackers
tracker2
tracker1
Mogile Storage Nodes
...
sto2
sto8
sto1
net.
http://www.danga.com/words/
LiveJournal Backend: Today
Roughly.
User DB Cluster 1
uc1a
uc1b
User DB Cluster 2
uc2a
uc2b
User DB Cluster 3
uc3a
uc3b
User DB Cluster 4
uc4a
uc4b
User DB Cluster 5
uc5a
uc5b
Memcached
mc4
mc3
mc2
mc12
...
mc1
mod_perl
web4
web3
web2
web50
...
web1
BIG-IP
bigip2
bigip1
perlbal (httpd/proxy)
proxy4
proxy3
proxy2
proxy5
proxy1
Global Database
slave1
master_a master_b
slave2 ... slave5
MogileFS Database
mog_a mog_b
Mogile Trackers
tracker2
tracker1
Mogile Storage Nodes
...
sto2
sto8
sto1
net.
RELAX...
RELAX...
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