Item7438 < Bugs

AppliesTo:	Component:	Priority:	CurrentState:	WaitingFor:	TargetRelease	ReleasedIn
Extension	VarCachePlugin	Enhancement	Closed		n/a

Add logic to invalidate cache of affected topics on topic creation or topic update:

parent topic
including topics
backlink topics

- 2014-02-22

This is now in SVN trunk and 6.0 branch.

-- TWiki:Main.PeterThoeny - 2014-02-25

For the CERN TWiki, this update led to very slow save times for the larger webs. The users of one web containing 30K+ topics experienced a save time (more specifically the TWiki::Plugins::VarCachePlugin::afterSaveHandler() method) from 20 to 30 seconds as a result.

We disabled it with

   * Set VARCACHEPLUGIN_INVALIDATEONCREATE = none
   * Set VARCACHEPLUGIN_INVALIDATEONUPDATE = none

in Main.TWikiPreferences

For our smaller webs this runs fine, however.

(FYI)

-- TWiki:Main.TerjeAndersen - 2015-01-09

Thanks Terje for the heads up. I updated the docs with this limitation.

Instead of disabling invalidation of affected topics for all webs you could leave the default in TWikiPreferences, and set to non in just your large web's WebPreferences.

-- TWiki:Main.PeterThoeny - 2015-01-09

ItemTemplate
Summary	Add cache invalidation logic, configurable
ReportedBy	TWiki:Main.PeterThoeny
Codebase	~twiki4, 6.0.0
SVN Range	TWiki-6.0.1-trunk, Thu, 09 Jan 2014, build 26720
AppliesTo	Extension
Component	VarCachePlugin
Priority	Enhancement
CurrentState	Closed
WaitingFor
Checkins	TWikirev:27024 TWikirev:27025 TWikirev:27026 TWikirev:27027
TargetRelease	n/a
ReleasedIn

Item7438: Add cache invalidation logic, configurable

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