History of Disaster - The BioWare Community Site
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- Robyn Douglas
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1 Writing a social application in PHP/ MySQL and what happens when a million people show up on opening day " Duleepa Dups Wijayawardhana MySQL Community Team "!!"#$%&#'()*#+(,-.$/#+*0#,-$1#-2
2 Who the hell am I?
3 Who the hell am I? PHP/MySQL Developer since 1999/2000
4 Who the hell am I? PHP/MySQL Developer since 1999/2000 MySQL Community Relations Manager in North America since... oh... last week :)
5 Who the hell am I? PHP/MySQL Developer since 1999/2000 MySQL Community Relations Manager in North America since... oh... last week :) Web Developer for MySQL
6 Who the hell am I? PHP/MySQL Developer since 1999/2000 MySQL Community Relations Manager in North America since... oh... last week :) Web Developer for MySQL Various positions at BioWare Corp
7 Who the hell am I? PHP/MySQL Developer since 1999/2000 MySQL Community Relations Manager in North America since... oh... last week :) Web Developer for MySQL Various positions at BioWare Corp Also run the Annual St. Patricks Day Drunk Dial (
8 What makes me qualified?
9 What makes me qualified? Spent a lot of time screaming at Murphy.
10 What makes me qualified? Spent a lot of time screaming at Murphy. Hired by BioWare to help create the BioWare Community Site for Neverwinter Nights (launched June 2002)
11 What makes me qualified? Spent a lot of time screaming at Murphy. Hired by BioWare to help create the BioWare Community Site for Neverwinter Nights (launched June 2002) Had no clue what to expect, but the rest as they say now is history.
12 What makes me qualified? Spent a lot of time screaming at Murphy. Hired by BioWare to help create the BioWare Community Site for Neverwinter Nights (launched June 2002) Had no clue what to expect, but the rest as they say now is history. Learned lots. Still learning...
13 What makes me qualified? Spent a lot of time screaming at Murphy. Hired by BioWare to help create the BioWare Community Site for Neverwinter Nights (launched June 2002) Had no clue what to expect, but the rest as they say now is history. Learned lots. Still learning... Insanity...
14 What are we going to cover?
15 What are we going to cover? A History of Disaster
16 What are we going to cover? A History of Disaster Launching the BioWare Community
17 What are we going to cover? A History of Disaster Launching the BioWare Community Pain Points of an Application
18 A History of Disaster
19 A History of Disaster What skill must you have to be a web developer/sysadmin in charge of a major web application?
20 A History of Disaster What skill must you have to be a web developer/sysadmin in charge of a major web application? The answer: You must be slightly insane!
21 A History of Disaster What skill must you have to be a web developer/sysadmin in charge of a major web application? The answer: You must be slightly insane!... and perhaps slightly masochistic :)
22 A History of Disaster
23 A History of Disaster Web Server Crashes (typical)
24 A History of Disaster Web Server Crashes (typical) Load Balancer Crashes
25 A History of Disaster Web Server Crashes (typical) Load Balancer Crashes Major Mail System crashes
26 A History of Disaster Web Server Crashes (typical) Load Balancer Crashes Major Mail System crashes File System Crashes (or how I came to hate NFS)
27 A History of Disaster Web Server Crashes (typical) Load Balancer Crashes Major Mail System crashes File System Crashes (or how I came to hate NFS) Database Crashes (sigh)
28 A History of Disaster Web Server Crashes (typical) Load Balancer Crashes Major Mail System crashes File System Crashes (or how I came to hate NFS) Database Crashes (sigh) Power outage in the building
29 A History of Disaster
30 A History of Disaster Sweden has an incredibly hot summer. Who knew.
31 A History of Disaster Sweden has an incredibly hot summer. Who knew. Building nearby burns down and takes down the city grid, we sit on the balcony and watch the fire...
32 A History of Disaster Sweden has an incredibly hot summer. Who knew. Building nearby burns down and takes down the city grid, we sit on the balcony and watch the fire... The toilet explodes and floods.
33 A History of Disaster Sweden has an incredibly hot summer. Who knew. Building nearby burns down and takes down the city grid, we sit on the balcony and watch the fire... The toilet explodes and floods. Someone connects the storm drain to the kitchen sink. Oops.
34 A History of Disaster
35 A History of Disaster Someone pours water on the electric mainboard and explodes your main electrical supply the day before a release. Big Oops.
36 A History of Disaster
37 A History of Disaster Imagine running through one amazingly crazy blizzard, drunk as you watch transformers explode and the sweeping cone of darkness spread across the city... You have the presence of mind to do a sequenced shut down but you can t see straight to bring anything back up so you sleep on the server room floor to sober up.
38 What is a Social Application?
39 What is a Social Application? A site which primarily focuses on interactions between users.
40 What is a Social Application? A site which primarily focuses on interactions between users. MySQL.com is not a social application,
41 What is a Social Application? A site which primarily focuses on interactions between users. MySQL.com is not a social application, Web 2.0 applications: Facebook, LinkedIn, MySpace, most community sites.
42 What is a Social Application? A site which primarily focuses on interactions between users. MySQL.com is not a social application, Web 2.0 applications: Facebook, LinkedIn, MySpace, most community sites. Developing and Launching a social application has special challenges
43 Neverwinter Nights Community...
44 A primer for launching a social application...
45 A primer for launching a social application Plan to have about 10 times the number of users that you conservatively expect.
46 A primer for launching a social application Plan to have about 10 times the number of users that you conservatively expect. 2. Be prepared for getting 100 times if your marketing has been good.
47 A primer for launching a social application Plan to have about 10 times the number of users that you conservatively expect. 2. Be prepared for getting 100 times if your marketing has been good. 3. Be prepared to scale *EVERY* aspect of your application: Web, DB, Mail etc.
48 A primer for launching a social application Plan to have about 10 times the number of users that you conservatively expect. 2. Be prepared for getting 100 times if your marketing has been good. 3. Be prepared to scale *EVERY* aspect of your application: Web, DB, Mail etc. 4. Be smart, launch softly.
49 A primer for launching a social application Plan to have about 10 times the number of users that you conservatively expect. 2. Be prepared for getting 100 times if your marketing has been good. 3. Be prepared to scale *EVERY* aspect of your application: Web, DB, Mail etc. 4. Be smart, launch softly. 5. Be even smarter, don t launch on a Friday evening.
50 Before the launch All cocky and sure of myself What could go wrong?
51 After the launch A picture is worth a thousand words
52 What we did (Donʼt do at home!)
53 What we did (Donʼt do at home!) Launched on a Friday afternoon, idea was to have less traffic.
54 What we did (Donʼt do at home!) Launched on a Friday afternoon, idea was to have less traffic. Site contained a function to send an alert if database was down, when site went down, it triggered 5,000+ s in a few mins and took down the mail server
55 What we did (Donʼt do at home!) Launched on a Friday afternoon, idea was to have less traffic. Site contained a function to send an alert if database was down, when site went down, it triggered 5,000+ s in a few mins and took down the mail server Not enough slaves to allow the site to function. Ripped apart desktop computers to create functional DB slaves.
56 Key to Success
57 Key to Success Figure out the pain points of an application
58 Key to Success Figure out the pain points of an application Be prepared to scale every part of your application.
59 Key to Success Figure out the pain points of an application Be prepared to scale every part of your application. Be prepared to sacrifice performance for availability, chances are good you won t be doing the other way around
60 Key to Success
61 Key to Success Become omniscient and omnipotent.
62 Key to Success Become omniscient and omnipotent. Identify Single Points of Failure (SPoF)...
63 Key to Success Become omniscient and omnipotent. Identify Single Points of Failure (SPoF)... If you have an SPoF... guaranteed it will fail
64 SPoFs and how to get yourself fired :)
65 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be:
66 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be: external dependencies (isp etc.)
67 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be: external dependencies (isp etc.) physical infrastructure: power.
68 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be: external dependencies (isp etc.) physical infrastructure: power. people
69 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be: external dependencies (isp etc.) physical infrastructure: power. people servers (db, web, load, firewall, dns...)
70 SPoFs and how to get yourself fired :) Do an SPoF audit on your application, SPoFs can be: external dependencies (isp etc.) physical infrastructure: power. people servers (db, web, load, firewall, dns...) application hooks/crons
71 Pain Point #1: The Web and File Servers
72 Pain Point #1: The Web and File Servers A typical PHP application with lots of visitors will have to run on a cluster of web servers.
73 Pain Point #1: The Web and File Servers A typical PHP application with lots of visitors will have to run on a cluster of web servers. Centralized file server or pushed file system?
74 Pain Point #1: The Web and File Servers A typical PHP application with lots of visitors will have to run on a cluster of web servers. Centralized file server or pushed file system? Centralized file server can be a bottleneck, pushed file system limits some programming options.
75 Pain Point #2: The Database How will you configure the database. Master/Slave?
76 Pain Point #2: The Database Sharding? More common amongst newer social applications.
77 Pain Point #2: The Database Perhaps MySQL Proxy? We ran MySQL Proxy as a test on MySQL.com, it s getting there!
78 Pain Point #2: The Database Perhaps look at Cloud options such as AWS. Allows growth at the least cost and lets someone else handle the problem of scaling for traffic!
79 Pain Point #3: The Mail Server
80 Pain Point #3: The Mail Server Most social applications depend on vast quantities of s to be sent out.
81 Pain Point #3: The Mail Server Most social applications depend on vast quantities of s to be sent out. What happens when your SMTP server gives up the ghost? Do you run SMTP servers on your web servers? Isolate the SMTP Servers?
82 Pain Point #3: The Mail Server Most social applications depend on vast quantities of s to be sent out. What happens when your SMTP server gives up the ghost? Do you run SMTP servers on your web servers? Isolate the SMTP Servers? We dumped mail into a MySQL Db and sent with custom daemon.
83 Pain Point #4: Controlling Master/ Slave Writes Almost every application of this kind obviously splits out reads to read slaves and writes to masters. Use some sort of DNS based load balancing on your DB servers to send queries?
84 Pain Point #5: Data Caching Replicated setups == Replication Lag. Replicated Forum software particularly vulnerable with increased traffic, missing posts etc. Slave dependent queries for IDs etc. may cause issues with data integrity.
85 Pain Point #5: Data Caching
86 Pain Point #5: Data Caching Memcached!!! When you write to the database you write to your memcached server, read from memcached before reading from the database again.
87 Pain Point #5: Data Caching Memcached!!! When you write to the database you write to your memcached server, read from memcached before reading from the database again. Are you going to the database too much? Counts of Users, Activity etc.?
88 Pain Point #5: Data Caching Memcached!!! When you write to the database you write to your memcached server, read from memcached before reading from the database again. Are you going to the database too much? Counts of Users, Activity etc.? Before memcached, we used filesystem files written by system processes.
89 Pain Point #6: The PHP Code
90 Pain Point #6: The PHP Code XDebug. If you aren t using it. Download it, learn it. Use it. Improve performance of your application. (
91 Pain Point #6: The PHP Code XDebug. If you aren t using it. Download it, learn it. Use it. Improve performance of your application. ( Profile your application.
92 Pain Point #6: The PHP Code XDebug. If you aren t using it. Download it, learn it. Use it. Improve performance of your application. ( Profile your application. Take a lesson from a high visibility site: Wikipedia, run a fraction of your requests through xdebug and profile.
93 Pain Point #6: The PHP Code A profile of mysql.com in April 2008
94 Pain Point #6: Monitoring
95 Pain Point #6: Monitoring If a person falls in the forest do you hear the PHP Fatal Error?
96 Pain Point #6: Monitoring If a person falls in the forest do you hear the PHP Fatal Error? Be omniscient in your applications. If something goes wrong do not wait for someone to tell you.
97 Pain Point #6: Monitoring If a person falls in the forest do you hear the PHP Fatal Error? Be omniscient in your applications. If something goes wrong do not wait for someone to tell you. Build monitoring into the application, but do you want High Performance?
98 Pain Point #6: Monitoring
99 Pain Point #6: Monitoring Capture your errors and logging into log files which are then monitored.
100 Pain Point #6: Monitoring Capture your errors and logging into log files which are then monitored. Establish a good monitoring tool which monitors not only the Servers but your Application.
101 Pain Point #6: Monitoring Capture your errors and logging into log files which are then monitored. Establish a good monitoring tool which monitors not only the Servers but your Application. Shameless plug for both MySQL Enterprise Monitoring and my own open source BigDaddy (bigdaddymonitor.org) which grew out of all these pain points
102 Pain Point #7: Your SQL Queries
103 Pain Point #7: Your SQL Queries In the end a PHP/MySQL application lives and dies on the strength of your queries.
104 Pain Point #7: Your SQL Queries In the end a PHP/MySQL application lives and dies on the strength of your queries. Make sure that you have good indexes on your tables. EXPLAIN always.
105 Pain Point #7: Your SQL Queries In the end a PHP/MySQL application lives and dies on the strength of your queries. Make sure that you have good indexes on your tables. EXPLAIN always. Make sure that you have query caching turned on go examine your slow query log.
106 Pain Point #7: Your SQL Queries
107 Pain Point #7: Your SQL Queries Queries do not always scale!
108 Pain Point #7: Your SQL Queries Queries do not always scale! Use some sort of query analyzer, custom or third party.
109 Pain Point #7: Your SQL Queries Queries do not always scale! Use some sort of query analyzer, custom or third party. When you develop, try to test expensive queries against a proper data set size.
110 Pain Point #8: Ajax, Javascript
111 Pain Point #8: Ajax, Javascript App performance is what the client sees, not what the server/server-op sees
112 Pain Point #8: Ajax, Javascript App performance is what the client sees, not what the server/server-op sees DB Setup tuned for Web 2.0 apps? Ajax applications tend to be less read heavy and more write heavy.
113 Pain Point #8: Ajax, Javascript App performance is what the client sees, not what the server/server-op sees DB Setup tuned for Web 2.0 apps? Ajax applications tend to be less read heavy and more write heavy. InnoDB versus MyISAM for primary key lookups.
114 Pain Point #8: Ajax, Javascript Client tuning is essential as much as server tuning. YSlow is one option:
115 Pain Point #9: All the other things
116 Pain Point #9: All the other things Over the years pain points have come in all shapes and sizes, including our apache logs :)
117 Pain Point #9: All the other things Over the years pain points have come in all shapes and sizes, including our apache logs :) We ended up creating a sharded db system with a simple perl script to dump web logs into a MySQL database.
118 Pain Point #9: All the other things Over the years pain points have come in all shapes and sizes, including our apache logs :) We ended up creating a sharded db system with a simple perl script to dump web logs into a MySQL database. Oddly worked as well if not better than a file system.
119 Final thought...
120 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence.
121 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence. NFS Crash
122 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence. NFS Crash File system corrupt
123 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence. NFS Crash File system corrupt DB Crash, Table corrupted
124 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence. NFS Crash File system corrupt DB Crash, Table corrupted Backup corrupted by another sequence of events.
125 Final thought... Murphy's Extended Law: If a series of events can go wrong, they will do so in the worst possible sequence. NFS Crash File system corrupt DB Crash, Table corrupted Backup corrupted by another sequence of events. I was on holiday
126 The moral of this sordid tale
127 The moral of this sordid tale Murphy Loves Web Application Developers.
128 The moral of this sordid tale Murphy Loves Web Application Developers. Everything goes wrong at some point
129 The moral of this sordid tale Murphy Loves Web Application Developers. Everything goes wrong at some point Just be prepared
130 The moral of this sordid tale Murphy Loves Web Application Developers. Everything goes wrong at some point Just be prepared Eliminate every SPoF (Single Point of Failure) in your system.
131
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