Mistakes Made and Lessons Learnt Scaling Plone post-Launch

•

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This is a run down of the mistakes we made and the lessons we learnt trying to scale a big Plone site with un-anticipated traffic once the site had gone live and the budget all been spent. Find out what we did wrong, and how we fixed it.

Technology Entertainment & Humor

Matt Hamilton
&
Matt Sital-Singh

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

0
Plone Conference 2011
San Francisco
Background

Matt Hamilton
Matt Sital-Singh

Use Case

• Learning Management-type system
• A lot of content
• Users ‘editing’ content, but not necessarily
aware of it
• Lots of ‘clustering’ of load on resources
Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

Scale
• Plone 3
• User accounts: 30,000
• Messages: 160,000
• Course questions: 260,000
• Other: 60,000
Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

1 Don’t Create Ghost
Content

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• User perception of speed
• If they expect a ‘read’ they want a ‘read’
- user signups
- course starting

• Will accept a delay if you are actually
processing something

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

2 Use Optimization
Products

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• experimental.catalogqueryplan
• experimental.contentcreation
• experimental.daterangeindexoptimisations
• experimental.aggressiveopaquespeedup
• collective.indexing
Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

3 One Plone site or
Multiple?

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• One Plone site per ‘site’
• Multiple ‘sites’ per Plone site
• Common content?

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

4 Large Catalogs are
Slow

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• We had 260,000 questions
• each had 2-4 answers
• = 520,000 - 1,400,000 answers
All in portal_catalog!

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

5
Optimize your Catalogs

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• Pre-load Catalog Queryplan
• Balance your BTrees

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

effective date index:

1308585257

1319126057

1319730857

1319817170

1319817198

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

1308585257

1319126057

1319730857

1319817170

1319817198

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

• Used catalog multiplexer to assign ‘Answer’
content type to dummy catalog

• Moved messages to separate
message_catalog

• Monkey-patch items out of the catalog?

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

6 If You Know Where
Something Is - Don’t
Search for it

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• Got into bad habit of using the catalog
ALL the time

• Don’t just blindly use catalog when
unrestrictedTraverse / contentValues will
do

• RAM is cheap, user patience is NOT

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

7 Use
unrestrictedSearchResults
if possible

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• unrestrictedSearchResults does not check:
• effective index
• allowed_roles_and_users index
➡ A lot less work for the catalog to do

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

8Is Plone the Right Tool?

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• “When you have a hammer, everything
looks like a nail...”

• A lot of this data is relational...
• Not much of it is CMSish
• Maybe should have used Pyramid?

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

9 Use Event Driven
Workﬂow
(Don’t recalculate)

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• User rating / Course ranking
• Use workﬂow event subscribers, don’t re-
calculate on view every time

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

10 Some things don’t need
to be immediate

Plone Conference 2011
San Francisco
Matt Hamilton
Matt Sital-Singh

• “You have 10 new messages”
• Not everything has to be updated all the
time in every location on the site

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

Thanks!

Plone Conference 2011 Matt Hamilton
San Francisco Matt Sital-Singh

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Mistakes Made and Lessons Learnt Scaling Plone post-Launch

2. Matt Hamilton & Matt Sital-Singh Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

3. 0 Plone Conference 2011 San Francisco Background Matt Hamilton Matt Sital-Singh

4. Use Case • Learning Management-type system • A lot of content • Users ‘editing’ content, but not necessarily aware of it • Lots of ‘clustering’ of load on resources Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

5. Scale • Plone 3 • User accounts: 30,000 • Messages: 160,000 • Course questions: 260,000 • Other: 60,000 Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

6. 1 Don’t Create Ghost Content Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

7. • User perception of speed • If they expect a ‘read’ they want a ‘read’ - user signups - course starting • Will accept a delay if you are actually processing something Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

8. 2 Use Optimization Products Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

9. • experimental.catalogqueryplan • experimental.contentcreation • experimental.daterangeindexoptimisations • experimental.aggressiveopaquespeedup • collective.indexing Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

10. 3 One Plone site or Multiple? Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

11. • One Plone site per ‘site’ • Multiple ‘sites’ per Plone site • Common content? Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

12. 4 Large Catalogs are Slow Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

13. • We had 260,000 questions • each had 2-4 answers • = 520,000 - 1,400,000 answers All in portal_catalog! Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

14. 5 Optimize your Catalogs Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

15. • Pre-load Catalog Queryplan • Balance your BTrees Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

16. effective date index: 1308585257 1319126057 1319730857 1319817170 1319817198 Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

17. 1308585257 1319126057 1319730857 1319817170 1319817198 Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

18. • Used catalog multiplexer to assign ‘Answer’ content type to dummy catalog • Moved messages to separate message_catalog • Monkey-patch items out of the catalog? Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

19. 6 If You Know Where Something Is - Don’t Search for it Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

20. • Got into bad habit of using the catalog ALL the time • Don’t just blindly use catalog when unrestrictedTraverse / contentValues will do • RAM is cheap, user patience is NOT Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

21. 7 Use unrestrictedSearchResults if possible Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

22. • unrestrictedSearchResults does not check: • effective index • allowed_roles_and_users index ➡ A lot less work for the catalog to do Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

23. 8Is Plone the Right Tool? Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

24. • “When you have a hammer, everything looks like a nail...” • A lot of this data is relational... • Not much of it is CMSish • Maybe should have used Pyramid? Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

25. 9 Use Event Driven Workﬂow (Don’t recalculate) Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

26. • User rating / Course ranking • Use workﬂow event subscribers, don’t recalculate on view every time Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

27. 10 Some things don’t need to be immediate Plone Conference 2011 San Francisco Matt Hamilton Matt Sital-Singh

28. • “You have 10 new messages” • Not everything has to be updated all the time in every location on the site Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

29. Thanks! Plone Conference 2011 Matt Hamilton San Francisco Matt Sital-Singh

Mistakes Made and Lessons Learnt Scaling Plone post-Launch

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