dynamic page caching for magnolia 5.4
Post on 28-Jul-2015
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#mconf15 @rah003
Magnolia Conference • Wednesday, June 10, 2015 • Basel, Switzerland, Europe, Earth, Solar System, Milky Way
Dynamic Page Caching in Magnolia 5.4
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Jan HaderkaRoman Kovařík
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2015 Magnolia 5.4
2014 Magnolia 5.3
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Cache? Just one?
FM TL Cache
Browser Cache
HttpResp Cache
Unsplash
RestReq Cache
RegistriesJR Item Cache
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Cache is a trade-off between perceived performance of a system, internal resource allocation and currentness of delivered data
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Do we need more?
Flickr / Kenny Louie
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Cache implementation
Flickr / A Syn
Restructured & improved
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Cache module structure
Flickr / A Syn
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Cache implementation
Flickr / A Syn
Separate config per cache
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Cache implementation
Flickr / A Syn
Site-aware CacheFilter
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Cache implementation
Flickr / A Syn
Cache core, impl and UI are now separate
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Cache module structure
Flickr / A Syn
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Cache implementation
Flickr / A Syn
ehCache 1.5 replaced w/ 2.10
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17 Flickr / A Syn
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ehCahe 1.5 ehCahe 2.10
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new ehCache
Flickr / A Syn
5-10% better performance
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new ehCache
Flickr / A Syn
no more disk persistence
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no disk persistence?
Flickr / A Syn
• cache is for production use • when do you restart prod server?
• on update • on crash
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no disk persistence?
Flickr / A Syn
drop-in replacement w/ persistence is BigMemory
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Cache implementation
Flickr / A Syn
new Memcached impl
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Why Memcached?
Flickr / A Syn
separate servers
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Why Memcached?
Flickr / A Syn
clusterable
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Why Memcached?
Flickr / A Syn
eternal
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Why Memcached?
Flickr / A Syn
shareable
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Why Memcached?
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double performance when serving first request*
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* measured with two public instances connected to same memcached server
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Cache implementation
Flickr / A Syn
new Supercache impl
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Why Supercache
Flickr / A Syn
external & persistent
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Why Supercache
Flickr / A Syn
served by load balancer
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Why Supercache
Flickr / A Syn
available for onDemand and sysEleven hosting
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Cache tools
Flickr / A Syn
new Cache browser app
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Cache Browser
Flickr / A Syn
explore your cache
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Cache Browser
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exercise control
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Cache Browser
Flickr / A Syn
one that rules them all
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In summary
Flickr / A Syn
•auto-discovery •using REST •single point of control •implementation agnostic
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Cache Browser
Flickr / A Syn
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Demo time?
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What about personalised pages?
Flickr / A Syn
They are now cached too
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How?
Flickr / A Syn
•p13n provides variant info into the cache key •Each variant gets it’s own cache entry
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Can personalised pages share fragments?
Flickr / A Syn
Yes, you need to: • configure such fragment as dynamic • use custom cache key generator
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Why not to share by default?
Flickr / A Syn
• complexity • performance
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Advanced Cache
Flickr / A Syn
Dynamic Page Caching DPC
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Dynamic?
Flickr / A Syn
Isn’t dynamic non-cacheable?
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Dynamic?
Flickr / A Syn
“dynamic pages are composed of fragments of content with
different time-to-live”#mconf15 @rah003
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So how do you do it?
Flickr / A Syn
Just render the page ;)
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60 Flickr / A Syn
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http://my.domain.com/travel
http://my.domain.com/travel/main/0
http://my.domain.com/travel/footer/04
http://my.domain.com/travel/footer/03http://my.domain.com/travel/footer/02
http://my.domain.com/travel/footer/01
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Magnolia meets SiteMesh
Flickr / A Syn
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Magnolia meets SiteMesh
Flickr / A Syn
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Inject content for components
Flickr / A Syn
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What tags?
Flickr / A Syn
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<mgnl:injecturi target=“/demo-project/about~mgnlArea=branding~” X-Magnolia-Fragment=“sitemesh=skip, ttl=0" >
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And those tags,
Flickr / A Syn
they got in, how exactly?
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listener.beforeRender()
listener.afterRender()
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Tags? Yeah, I did those!
Flickr / A Syn
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Home address: config:/server/rendering/engine/listeners
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In summary
Flickr / A Syn
• RenderingListener will inject tags • SiteMeshFilter will replace tags with cached (or rendered entries) of content • SiteMesh lives in the chain before Cache, so it is all transparent to it
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In summary
Flickr / A Syn
• Page can consist of multiple fragments with different TTL • Upon expiration content will be re-rendered • Cache filter will cache whatever requested, fragment or full page
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Remember
Flickr / A Syn
The main goal of DPC is improving performance. This is done by caching
non-dynamic portions of a page
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BEWARE!
Flickr / A Syn
Every dynamic component needs to be requested separately. That means, more
dynamic components = more time to render.
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BEWARE!
Flickr / A Syn
more dynamic components = slower rendering Consider excluding such page from the cache!
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BEWARE!
Flickr / A Syn
Although recursive dynamic fragments are supported, it doesn't make sense to
use this feature unless nested components have different TTL.
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BEWARE!
Flickr / A Syn
Group of dynamic componentslocated next to each other
will be rendered faster in one dynamic area rather than
each separately.#mconf15 @rah003
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Say it really works,
Flickr / A Syn
but does it actually scale?
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Performance ✔
Flickr / A Syn
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Page=cached SiteMesh=false
Page=cached SiteMesh=true
Snippets: none
Page=cached SiteMesh=true
Snippets: 1cached
Page=cached SiteMesh=true
Snippets: 1uncached
Page=uncached SiteMesh=false
Page=uncached SiteMesh=true
TTFB 0.00233 0.00311 0.004119 0.04095 0.04864 0.06377Total 0.00275 0.00315 0.004142 0.04143 0.06443 0.06418% TTFB 5 6 8 84 100 131% Total 4 5 6 64 100 100
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Can same fragment be shared by multiple pages?
Flickr / A Syn
yes, but you need custom cache key/generator (just like p13n)
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Thanks!
Questions?
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Backup
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NonCacheableEntry
Flickr / A Syn
anti-coagulant for your pipeline
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PersonalizationAnalytics Commerce CRM
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86 Unsplash / Maja Petric
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