Varnish Cache and its usage in the real world!
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Varnish Cache and its usage in the real world!

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Varnish Cache and its usage in the real world! - Magento implementation guide.

Varnish Cache and its usage in the real world! - Magento implementation guide.

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    Varnish Cache and its usage in the real world! Varnish Cache and its usage in the real world! Presentation Transcript

    • Varnish Cache and its usage in the real world Ivan Chepurnyi Owner EcomDev BV
    • Ivan Chepurnyi About me Meet Magento • Technical Consultant, Owner at EcomDev B.V. • Started as one of the first five developers in original Magento core team • Magento Developer Coach in Europe • Main areas of my expertise: – System Architecture – Performance Optimization – Test Driven Development – Complex Customizations
    • Ivan Chepurnyi Meet Magento Varnish is not a cache backend
    • Ivan Chepurnyi Meet Magento Varnish is a frontend caching proxy
    • Ivan Chepurnyi Simple Workflow Meet Magento First call to a page
    • Ivan Chepurnyi Simple Workflow Meet Magento Subsequent requests
    • Ivan Chepurnyi How Varnish Works Meet Magento recv hit passmiss hash pipe deliver fetch • recv – request is received from client • pipe – direct output of backend data (streaming) • hash – request is cacheable, lookup cache entry • pass – request is not cacheable • hit – cache entry is found • miss – cache entry not found • fetch – retrieval of data from backend • deliver – return data to client
    • Ivan Chepurnyi What can we do with it? Meet Magento • Cache static pages (Homepage, CMS, Contacts, etc) • Cache catalog pages: – Category listings – Product search results – Product view pages • Cache page parts: – CMS Blocks – Header – Footer
    • Ivan Chepurnyi Meet Magento Is it possible to clear Varnish cache based on product, category, store, etc? YES!!!
    • Ivan Chepurnyi Meet Magento The Secret is in Cache Object structure
    • Ivan Chepurnyi Cached Object in Varnish Meet Magento Cached Object Response Headers Response Body Cache Metadata Cache Content
    • Ivan Chepurnyi Meet Magento We just going to supply object ID with its type in response headers, so it later on can be used to flush pages containing our object.
    • Ivan Chepurnyi Meet Magento But is it possible to make cache lifetime dynamic per product, category, etc? YES!!!
    • Ivan Chepurnyi Meet Magento You can supply a response header, that contains a TTL of the page.
    • Ivan Chepurnyi Meet Magento So what should be done to implement Varnish in Magento with all the benefits?
    • Ivan Chepurnyi Varnish in Magento Meet Magento • Collect current page objects, that are shown on the page. Also add them into response headers. • Create a connector to a Varnish admin protocol, that will be used for flushing of the page by object ids. • Implement auto-updated AJAX blocks for: – Shopping cart – Wishlist – Customer Account links
    • Ivan Chepurnyi Meet Magento But I have good news: I alredy developed a module that gives you a solid foundation for using Varnish in your project!
    • Ivan Chepurnyi EcomDev_Varnish Meet Magento Download URL: http://bit.ly/ecomdev_varnish Requires: • Varnish 3.0 • Minimal changes to your theme Supports: • Flush of cache on update of product, category, cms page, csm block, price rules • Client side cacheable AJAX placeholders (Cart, Wishlist, etc) • Possibility to make a cache based on customer segment • Cache for logged in users
    • Ivan Chepurnyi Before you start using it… Meet Magento • Make a list of dynamic blocks in your project: – Shopping Cart – Login blocks – Special Promo for Customer • Validate possible visitor segments of your project: – Customer group – Language / Country • Make a list of themes you need to modify
    • Ivan Chepurnyi Meet Magento Making an element dynamic on varnish cached page
    • Ivan Chepurnyi Code Sample Dynamic Block Meet Magento <default_varnish> <reference name=”parentBlock”> <action method="unsetChild”> <block>dynamicBlockAlias</block> </action> <block as="dynamicBlockAlias” name=”dynamicBlockPlaceholder" template="ecomdev/varnish/wrapper/placeholder.phtml" type="core/template"> <action method="append"> <block>dynamicBlock</block> </action> <action method="setBlockName"> <block>dynamicBlock</block> </action> <action method="setCookie"> <cookie>dynamicCookie</cookie> </action> <action method="setWrapperId"> <htmlId>elementId</htmlId> </action> </block> </reference> </default_varnish> Layout File • parentBlock – name of the parent block • dynamicBlockAlias – alias of the dynamic block in parent block • dynamicBlockPlaceholder – unique name of your placeholder • dynamicBlock – name of the original dynamic block • dynamicCookie – name of the cookie for dynamic blocks • elementId – HTML ID for the placeholder div, that is going to be used as container
    • Ivan Chepurnyi Available Dynamic Cookies Meet Magento • quote_checksum – checksum of the current quote contents • customer_checksum – checksum based on the customer identification, if logged in customer gets changed • is_logged_in – boolean flag of the logged in state of the visitor • segment_checksum – checksum of the current customer segment: – customer group id – store view
    • Ivan Chepurnyi How does it work? Meet Magento • Your original block gets wrapped by a custom div with some JS code • When customer visits a page, JS checks for a cookie value and compares it with latest saved one in local/session storage • If it is different it requests /varnish/ajax/reload for retrieving dynamic content and saves it to local/session storage • If it is the same, it just updates block from local/session storage
    • Ivan Chepurnyi Meet Magento Adding custom TTL for a page
    • Ivan Chepurnyi Code Sample Custom TTL Meet Magento // Somewhere in your code you just simply call it // Varnish module will take the lowest value in array of TTL that were added Mage::helper(‘ecomdev_varnish’) ->addTtl($timeInSeconds); Code Block
    • Ivan Chepurnyi Meet Magento Making custom page cacheable
    • Ivan Chepurnyi Code Sample Custom Page Meet Magento <config> <varnish> <pages> <layout_handle_name translate="label" module=”your_module"> <label>Your Page Name</label> </layout_handle_name> </pages> </varnish> <default> <varnish> <pages> <layout_handle_name_time>360</layout_h andle_name_time> </pages> </varnish> </default> </config> config.xml • layout_handle_name – full name of the layout handle that should be cacheable • your_module – name of the module used for translation of label • Your Page Name – name of your pages, that will be shown in System Configuration - Varnish Cache • 360 – default cache lifetime of the page
    • Ivan Chepurnyi Varnish vs Full Page Cache Meet Magento Varnish • Avg. time to first byte 30ms • Dedicated software • Tools to monitor cache usage • Scalable • Requires adaptation of themes for dynamic parts • Possibility to flush group of pages Magento FPC implementation • Avg. time to first byte 300-400ms • Magento code level • N/A • Only as another backend node • Most of the time it is not required • N/A
    • Ivan Chepurnyi Meet Magento But why do I need to use EcomDev_Varnish?
    • Ivan Chepurnyi EcomDev_Varnish vs the others Meet Magento • Cache lifetime specified on Magento code level, without changing VCL • By using collectors & processors, it can be easily extended to support additional entities • Client-side cacheable dynamic parts • Cache enabled for all kind of visitors • Saves your money on hardware
    • Ivan Chepurnyi Meet Magento The choice is up to you!
    • Ivan Chepurnyi OpenSource Roadmap 2014 Meet Magento 1. Finalize EcomDev_Varnish module and make it open source; 2. EcomDev_PHPUnit refactoring for API based fixtures; Progress: 20% 3. Working on EcomDev_Index module, to provide alternative of standard indexation mechanism in Magento: – Flat Indexers (failover indexation) – UrlRewrites (full refactor of existing module) – Layered Navigation (Sphinx) – Better Search (Sphinx)
    • Ivan Chepurnyi Meet Magento Thank You!
    • Questions? Email: ivan@ecomdev.org Website: http://www.ecomdev.org LinkedIn: http://nl.linkedin.com/in/ivanchepurnyi Twitter: https://twitter.com/IvanChepurnyi