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Negotiating crawl budget with googlebots
The document discusses the evolution of web content generation and Google's crawling mechanisms, highlighting the growth of user-generated content and the challenges of managing crawl budgets. It details how Googlebot prioritizes which pages to crawl based on factors like page importance, server performance, and historical data. Additionally, it outlines strategies for webmasters to improve their site's crawlability and subsequently influence their search engine visibility.
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Negotiating crawl budget with googlebots
- 1. USING ’PAGE IMPORTANCE’ IN ONGOING CONVERSATION WITH GOOGLEBOT TO GET JUST A BIT MORE THAN YOUR ALLOCATED CRAWL BUDGET NEGOTIATING CRAWL BUDGET WITH GOOGLEBOTS Dawn Anderson @ dawnieando
- 2. Another Rainy Day In Manchester @dawnieando
- 3.
- 4. 1994 - 1998 “THE GOOGLE INDEX IN 1998 HAD 60 MILLION PAGES” (GOOGLE) (Source:Wikipedia.org)
- 5. 2000 “INDEXED PAGES REACHES THE ONE BILLION MARK” (GOOGLE) “IN OVER 17 MILLION WEBSITES” (INTERNETLIVESTATS.COM)
- 6. 2001 ONWARDS ENTER WORDPRESS, DRUPAL CMS’, PHP DRIVEN CMS’, ECOMMERCE PLATFORMS, DYNAMIC SITES, AJAX WHICH CAN GENERATE 10,000S OR 100,000S OR 1,000,000S OF DYNAMIC URLS ON THE FLY WITH DATABASE ‘FIELD BASED’ CONTENT DYNAMIC CONTENT CREATION GROWS ENTER FACETED NAVIGATION (WITH MANY # PATHS TO SAME CONTENT) 2003 – WE’RE AT 40 MILLION WEBSITES
- 7. 2003 ONWARDS –USERS BEGIN TO JUMP ON THE CONTENT GENERATION BANDWAGGON LOTS OF CONTENT – IN MANY FORMS
- 8. WE KNEW THE WEB WAS BIG… (GOOGLE, 2008) https://googleblog.blogspot.co.uk/2008/07/we-‐knew-‐web-‐was-‐big.html “1 trillion (as in 1,000,000,000,000) unique URLs on the web at once!” (Jesse Alpert on Google’s Official Blog, 2008) 2008 – EVEN GOOGLE ENGINEERS STOPPED IN AWE
- 9. 2010 – USER GENERATED CONTENT GROWS “Let me repeat that: we create as much information in two days now as we did from the dawn of man through 2003” “The real issue is user-‐ generated content.” (Eric Schmidt, 2010 – Techonomy Conference Panel) SOURCE: http://techcrunch.com/2010/08/04/schmidt-‐data/
- 10. Indexed Web containsat least 4.73 billion pages (13/11/2015) CONTENT KEEPS GROWING Total number of websites 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 1,000,000,000 750,000,000 500,000,000 250,000,000 THE NUMBER OF WEBSITES DOUBLED IN SIZE BETWEEN 2011 AND 2012 AND AGAIN BY 1/3 IN 2014
- 11. EVEN SIR TIM BERNERS-‐LEE (Inventor of www) TWEETED 2014 – WE PASS A BILLION INDIVIDUAL WEBSITES ONLINE
- 12. 2014 – WE ARE ALL PUBLISHERS SOURCE: http://wordpress/activity/posting
- 13. YUP - WE ALL‘LOVE CONTENT’ IMAGINE HOW MANY UNIQUE URLs COMBINED THIS AMOUNTS TO? – A LOT http://www.internetlivestats.com/total-‐number-‐of-‐websites/
- 14. “As of the end of 2003, the WWW is believed to include well in excess of 10 billion distinct documents or web pages, while a search engine may have a crawling capacity that is less than half as many documents” (MANY GOOGLE PATENTS) CAPACITY LIMITATIONS – EVEN FOR SEARCH ENGINES Source: Scheduler for search engine crawler Google Patent US 8042112 B1, (Zhu et al)
- 15. “So how many unique pages does the web really contain? We don't know; we don't have time to look at them all! :-‐)” (Jesse Alpert, Google, 2008) Source: https://googleblog.blogspot.co.uk/2008/07/we-‐knew-‐web-‐ was-‐big.html NOT ENOUGH TIME SOME THINGS MUST BE FILTERED
- 16. A LOT OF THE CONTENT IS ‘KIND OF THE SAME’ “There’s a needle in here somewhere” “It’s an important needle too”
- 17. Capacity limits on Google’s crawling system By prioritising URLs for crawling By assigning crawl period intervals to URLs How have search engines responded? By creating work ‘schedules’ for Googlebots WHAT IS THE SOLUTION? “To keep within the capacity limits of the crawler, automated selection mechanisms are needed to determine not only which web pages to crawl, but which web pages to avoid crawling”. -‐ Scheduler for search engine crawler, (Zhu et al)
- 18. ‘Managing items ina crawl schedule’ Include GOOGLE CRAWL SCHEDULER PATENTS ‘Scheduling a recrawl’ ‘Web crawler scheduler that utilizes sitemaps from websites’ ‘ ‘Document reuse in a search engine crawler’ ‘Minimizing visibility of stale content in web searching including revising web crawl intervals of documents’ ‘Scheduler for search engine’ EFFICIENCY IS NECESSARY
- 19. CRAWL BUDGET 1. Crawl Budget – “An allocation of crawl frequency visits to a host (IP LEVEL)” 3. Pages with a lot of links get crawled more 4. The vast majority of URLs on the web don’t get a lot of budget allocated to them (low to 0 PageRank URLs). 2. Roughly proportionate to PageRank and host load / speed / host capacity https://www.stonetemple.com/matt-‐cutts-‐ interviewed-‐by-‐eric-‐enge-‐2/
- 20. BUT… MAYBE THINGS HAVE CHANGED? CRAWL BUDGET / CRAWL FREQUENCY IS NOT JUST ABOUT HOST-LOAD AND PAGERANK ANY MORE
- 21. STOP THINKING IT’S JUST ABOUT ‘PAGERANK’ http://www.youtube.com/watch?v=GVKcMU7YNOQ&t=4m45s “You keep focusing on PageRank”… “There’s a shit-‐ton of other stuff going on” (Illyes, G, Google -‐ 2016)
- 22. THERE’S A LOT OF OTHER THINGS AFFECTING ‘CRAWLING’ Transcript: https://searchenginewatch.com/2016/04/06/webpromos-‐qa-‐with-‐googles-‐andrey-‐lipattsev-‐transcript/ WEB PROMOS Q & A WITH GOOGLES ANDREY LIPATTSEV
- 23. WHY? BECAUSE… THE WEB GOT ‘MAHOOOOOSIVE’ AND CONTINUES TO GET ‘MAHOOOOOOSIVER’ SITES GOT MORE DYNAMIC, COMPLEX, AUTO-GENERATED, MULTI- FACETED, DUPLICATED, INTERNATIONALISED, BIGGER, BECAME PAGINATED AND SORTED
- 24. WE NEED MORE WAYS TO GET MORE EFFICIENT AND FILTER OUT TIME-WASTING CRAWLING SO WE CAN FIND IMPORTANT CHANGES QUICKLY GOOGLEBOT’S TO-DO LIST GOT REALLY BIG
- 25. Hard and Soft Crawl Limits Importance Thresholds Min and Max Hints & ‘Hint ranges’ Importance Crawl Periods Scheduling FURTHER IMPROVED CRAWLING EFFICIENCY SOLUTIONS NEEDED Prioritization Tiered Crawling Buckets (‘Real Time, Daily, Base Layer)
- 26. SEVERAL PATENTS UPDATED ‘ManagingURLs’ (Alpert et al, 2013) (PAGE IMPORTANCE DETERMINING SOFTAND HARD LIMITS ON CRAWLING) ‘Managing Items in a Crawl Schedule’ (Alpert, 2014) ‘ ‘Scheduling a Recrawl’ (Anerbach, Alpert, 2013) (PREDICTING CHANGE FREQUENCY IN ORDER TO SCHEDULE NEXTVISIT, EMPLOYING HINTS (Min & Max) (SEEM TO WORK TOGETHER) ‘Minimizing visibility of stale content in web searching including revising web crawl intervals of documents’ (INCLUDES EMPLOYING HINTS TO DETECT PAGES ‘NOT’ TO CRAWL)
- 27. Crawled multiple times daily Crawled daily Or bi-‐daily Crawled least on a ‘round robin’ basis – only ‘active’ segment is crawledSplit into segments on random rotation MANAGING ITEMS IN A CRAWL SCHEDULE (GOOGLE PATENT) Real Time Crawl Daily Crawl Base Layer Crawl 3 layers / tiers / buckets for scheduling URLs are moved in and out of layers based on past visits data Most Unimportant
- 28. CAN WE ESCAPE THE ‘BASE LAYER’ CRAWL BUCKET RESERVED FOR ‘UNIMPORTANT’ URLS?
- 29. 10 types of Googlebot SOME OF THE MAJOR SEARCH ENGINE CHARACTERS History Logs / History Server The URL Scheduler / Crawl Manager
- 30. HISTORY LOGS /HISTORY SERVERS HISTORY LOGS / HISTORY SERVER -‐ Builds a picture of historical data and past behaviour of the URL and ‘importance’ score to predict and plan for future crawl scheduling • Last crawled date • Next crawl due • Last server response • Page importance score • Collaborates with link logs • Collaborates with anchor logs • Contributes info to scheduling
- 31. ‘BOSS’- URL SCHEDULER/ URL MANAGER Think of it as Google’s line manager or ‘air traffic controller’ for Googlebots in the web crawling system • Schedules Googlebot visits to URLs • Decides which URLs to ‘feed’ to Googlebot • Uses data from the history logs about past visits (Change rate and importance) • Calculates importance crawl threshold • Assigns visit regularity of Googlebot to URLs • Drops ‘max and min hints’ to Googlebot to guide on types of content NOT to crawl or to crawl as exceptions. • Excludes some URLs from schedules • Assigns URLs to ‘layers / tiers’ for crawling schedules • Scheduler checks URLs for ‘importance’, ‘boost factor’ candidacy, ‘probability of modification’ • Budgets are allocated to IPs and shared amongst domains there JOBS
- 32. • ‘Ranks nothing at all’ • Takes a list of URLs to crawl from URL Scheduler • Runs errands & makes deliveries for the URL server, indexer / ranking engine and logs • Makes notes of outbound linked pages and additional links for future crawling • Follows directives (robots) and takes ‘hints’ when crawling • Tells tales of URL accessibility status, server response codes, notes relationships between links and collects content checksums (binary data equivalent of web content) for comparison with past visits by history and link logs • Will go beyond the crawl schedule if it finds something more important than URLs scheduled GOOGLEBOT - CRAWLER JOBS
- 33. WHAT MAKES THE DIFFERENCE BETWEEN BASE LAYER AND ‘REAL TIME’ SCHEDULE ALLOCATION?
- 34. CONTRIBUTING FACTORS 1. Page Importance (which may include PageRank) 3. Soft limits and hard crawl limits 4. Host load capability & past site performance (speed and access) (IP level and domain level within) 2. Hints (max and min) 5. Probability / predictability of ‘CRITICAL MATERIAL’ change + importance crawl period
- 35. 1 - PAGEIMPORTANCE - Page importance is the importance of a page independent of a query • Location in Site (e.g. home page more important than parameter 3 level output) • PageRank • Page type / file type • Internal PageRank • Internal Backlinks • In-‐site Anchor Text Consistency • Relevance (content, anchors and elements) to a topic (Similarity Importance) • Directives from in-‐page robot and robots.txt management • Parent quality brushes off on child page quality IMPORTANT PARENTS LIKELY SEEN TO HAVE IMPORTANT CHILD PAGES
- 36. 2 - HINTS- ’MIN’ HINTS & ’MAX’ HINTS MIN HINT / MIN HINT RANGES • e.g. Programmatically generated content which changes content checksum on load • Unimportant duplicate parameter URLs • Canonicals • Rel=next, rel=prev • HReflang • Duplicate content • Spammy URLs? • Objectionable content MAX HINT / MAX HINT RANGES • CHANGE CONSIDERED ‘CRITICAL MATERIAL CHANGE’ (useful to users e.g. availability, price) & / or improved site sections or change to IMPORTANT but infrequently changing content? • Important pages / page range updates E.G. rel="prev" and rel="next" a ct as hints to Google, not absolute directives https://support.google.com/webm asters/answer/1663744?hl=en&re f_topic=4617741
- 37. 3 - HARDAND SOFT LIMITS ON CRAWLING If URLs are discovered during crawling that are more important than those scheduled to be crawled then Googlebot can go beyond its schedule to include these up to a hard crawl limit ‘Soft’ crawl limit is set (Original schedule) ‘Hard’ crawl limit is set (E.G. 130% of schedule) FOR IMPORTANT FINDINGS
- 38. 4 – HOSTLOAD CAPACITY / PAST SITE PERFORMANCE Googlebot has a list of URLs to crawl Naturally, if your site is fast that list can be crawled quicker If Googlebot experiences 500s e.g. she will retreat & ‘past performance ’ is noted If Googlebot doesn’t get ‘round the list’ you may end up with ‘overdue’ URLs to crawl
- 39. • Not all change is considered equal • There are many dynamic sites with low importance pages changing frequently – SO WHAT • Constantly changing your page just to get Googlebot back won’t work if the page is low importance (crawl importance period < change rate) POINTLESS • Hints are employed to determine pages which simply change the content checksum with every visit • Features are weighted for change importance to user (price > colour e.g.) • Change identified as useful to users is considered ‘CRITICAL MATERIAL CHANGE’ • Don’t just try to randomise things to catch Googlebot’s eye • That counter or clock you added probably isn’t going to help you get more attention, nor random or shuffle • Change on some types of pages is more important than other pages (e.g. Home page CNN > SME about us page) 5 - CHANGE
- 40. • Current capacity of the web crawling system is high • Your URL has a high ‘importance score’ • Your URL is in the real time (HIGH IMPORTANCE), daily crawl (LESS IMPORTANT) or ‘active’ base layer segment (UNIMPORTANT BUT SELECTED) • Your URL changes a lot with CRITICAL MATERIAL CONTENT change (AND IS IMPORTANT) • Probability and predictability of CRITICAL MATERIAL CONTENT change is high for your URL (AND URL IS IMPORTANT) • Your website speed is fast and Googlebot gets the time to visit your URL on its bucket list of scheduled URLs that visit • Your URL has been ‘upgraded’ to a daily or real time crawl layer as it’s importance is detected as raised • History logs and URL Scheduler ’learn’ together FACTORS AFFECTING GOOGLEBOT HIGHER VISIT FREQUENCY
- 41. • Current capacity of web crawling system is low • Your URL has been detected as a ‘spam’ URL • Your URL is in an ‘inactive’ base layer segment (UNIMPORTANT) • Your URLs are ‘tripping hints’ built into the system to detect non-‐ critical change dynamic content • Probability and predictability of critical material content change is low for your URL • Your website speed is slow and Googlebot doesn’t get the time to visit your URL • Your URL has been ‘downgraded’ to an ‘inactive’ base layer (UNIMPORTANT) segment • Your URL has returned an ‘unreachable’ server response code recently • In-‐page robots management or robots.txt send wrong signals FACTORS AFFECTING LOWER GOOGLEBOT VISIT FREQUENCY
- 42. GET MORE CRAWL BY ‘TURNING GOOGLEBOT’S HEAD’ – MAKE YOUR URLs MORE IMPORTANT AND ‘EMPHASISE’ IMPORTANCE
- 43. • Hard limits and soft limits • Follows ‘min’ and ‘max’ Hints • If she finds something important she will go beyond a scheduled crawl (SOFT LIMIT) to seek out importance (TO HARD LIMIT) • You need to IMPRESS Googlebot • If you ‘bore’ Googlebot she will return to boring URLs less (e.g. with pages all the same (duplicate content) or dynamically generated low usefulness content) • If you ’delight’ Googlebot she will return to delightful URLs more (they became more important or they changed with ‘CRITICAL MATERIAL CHANGE’) • If she doesn’t get her crawl completed you will end up with an ‘overdue’ list of URLs to crawl GOOGLEBOT DOES AS SHE’S TOLD – WITH A FEW EXCEPTIONS
- 44. • Your URL became more important and achieved a higher ‘importance score’ via increased PageRank • Your URL became more important via increased IB(P) (INTERNAL BACKLINKS IN OWN SITE) relative to other URLs within your site (You emphasised importance) • You made the URL content more relevant to a topic and improved the importance score • The parent of your URL became more important (E.G. IMPROVED TOPIC RELEVANCE (SIMILARITY), PageRank OR local (in-‐site) importance metric) • YOUR ‘IMPORTANCE SCORE’ OF SOME URLS EXCEEDED THE ‘IMPORTANCE SOFT LIMIT THRESHOLD’ SO THAT IT IS INCLUDED FOR CRAWLING WHILST BEING VISITED UP TO A POINT OF ‘HARD LIMIT’ CRAWLING (E.G. 130% OF SCHEDULED CRAWLING) GETTING MORE CRAWL BY IMPROVING PAGE IMPORTANCE
- 45. HOW DO WE DO THIS?
- 46. TO DO -FIND GOOGLEBOT AUTOMATE SERVER LOG RETRIEVAL VIA CRON JOB grep Googlebot access_log >googlebot_access.txt ANALYSE THE LOGS
- 47. LOOK THROUGH SPIDER-EYES PREPARETO BE HORRIFIED Incorrect URL header response codes 301 redirect chains Old files or XML sitemaps left on server from years ago Infinite/ endless loops (circular dependency) On parameter driven sites URLs crawled which produce same output AJAX content fragments pulled in alone URLs generated by spammers Dead image files being visited Old CSS files still being crawled and loading EVERYTHING You may even see ’mini’ abandoned projects within the site Legacy URLs generated by long forgotten .htaccess regex pattern matching Googlebot hanging around in your ‘ever-‐changing’ blog but nowhere else
- 48. URL CRAWL FREQUENCY ’CLOCKING’ Spreadsheet provided by @johnmu during Webmaster Hangout -‐ https://goo.gl/1pToL8 Identify your ‘real time’, ‘daily’ and ‘base layer’ URLs -‐ ARE THEY THE ONES YOU WANT THERE? WHAT IS BEING SEEN AS UNIMPORTANT? NOTE GOOGLEBOT Do you recognise all the URLs and URL ranges that Are appearing? If not… Why not?
- 49. IMPROVE & EMPHASISEPAGE IMPORTANCE • Cross modular internal linking • Canonicalization • Important URLs in XML sitemaps • Anchor text target consistency (but not spammyrepetition of anchors everywhere (it’s still output)) • Internal links in right descending order – emphasise IMPORTANCE • Reduce boiler plate content and improve relevance of content and elements to specific topic (if category) / product (if product page) / subcategory (if subcategory) • Reduce duplicate content parts of page to allow primary targets to take ’IMPORTANCE’ • Improve parent pages to raise IMPORTANCE reputation of the children rather than over-‐optimising the child pages and cannibalising the parent. • Improve content as more ‘relevant’ to a topic to increase ‘IMPORTANCE’ and get reassigned to a different crawl layer • Flatten ‘architectures’ • Avoid content cannibalisation • Link relevant content to relevant content • Build strong highly relevant ‘hub’ pages to tie together strength & IMPORTANCE
- 50. EMPHASISE IMPORTANCE WISELY USE CUSTOM XML SITEMAPS E.G. XML UNLIMITED SITEMAP GENERATOR PUT IMPORTANT URLS IN HERE IF EVERYTHING IS IMPORTANT THEN IMPORTANCE IS NOT DIFFERENTIATED
- 51. KEEP CUSTOM SITEMAPS‘CURRENT’ AUTOMATICALLY AUTOMATE UPDATES WITH CRON JOBS OR WEB CRON JOBS IT’S NOT AS TECHNICALAS YOU MAY THINK – USE WEB CRON JOBS
- 52. BE ‘PICKY’ ABOUTWHAT YOU INCLUDE IN XML SITEMAPS EXCLUDE AND INCLUDE CRAWL PATHS IN XML SITEMAPS TO EMPHASISE IMPORTANCE
- 53. IF YOU CAN’TIMPROVE - EXCLUDE (VIA NOINDEX) FOR NOW • YOU’RE OUT FOR NOW • When you improve you can come back in • Tell Googlebot quickly that you’re out (via temporary XML sitemap inclusion) • But ‘follow’ because there will be some relevance within these URLs • Include again when you’ve improved • Don’t try to canonicalize me to something in the index
- 54. OR REMOVE –410 GONE (IF IT’S NEVER COMING BACK) http://faxfromthefuture.bandcamp.com/track/410-‐ gone-‐acoustic-‐demo EMBRACE THE ‘410 GONE’ There’s Even A Song About It
- 55. #BIGSITEPROBLEMS – LOSETHE INDEX BLOAT LOSE THE BLOAT TO INCREASE THE CRAWL No. of unimportant URLs indexed extend far beyond the available importance crawl threshold allocation
- 56. Tags: I, must, tag, this, blog, post, with, every, possible, word, that, pops, into, my, head, when, I, look, at, it, and, dilute, all, relevance, from, it, to, a, pile, of, mush, cow, shoes, sheep, the, and, me, of, it Image Credit: Buzzfeed Creating ‘thin’ content and Even more URLs to crawl #BIGSITEPROBLEMS - LOSE THE CRAZY TAG MAN
- 57. Most Important Page1 Most Important Page 2 Most Important Page 3 IS THIS YOUR BLOG?? HOPE NOT #BIGSITEPROBLEMS – INTERNAL BACKLINKS SKEWED IMPORTANCE DISTORTED BY DISPROPORTIONATE INTERNAL LINKING - LOCAL IB (P) – INTERNAL BACKLINKS
- 58. Optimize Everything: I must optimize ALL the pages across a category descendants for the same terms as my primary target category page so that each of them is of almost equal relevance to the target page and confuse crawlers as to which is the important one. I’ll put them all in a sitemap as standard too just for good measure. Image Credit: Buzzfeed HOW CAN SEARCH ENGINES KNOW WHICH IS MOST IMPORTANT TO A TOPIC IF ‘EVERYTHING’ IS IMPORTANT?? #BIGSITEPROBLEMS - WARNING SIGNS – LOSE THE ‘MISTER OVER-OPTIMIZER’ ‘OPTIMIZE ALL THE THINGS’
- 59. Duplicate Everything: I must have a massive boiler plate area in the footer, identical sidebars and a massive mega menu with all the same output in sitewide. I’ll put very little unique content into the page body and it will also look very much like it’s parents and grandparents too. From time to time I’ll outrank my parents and grandparent pages but ‘Meh’… Image Credit: Buzzfeed HOW CAN SEARCH ENGINES KNOW WHICH IS MOST IMPORTANT PAGE IF ALL IT’S CHILDREN AND GRANDCHILDREN ARE NEARLY THE SAME?? #BIGSITEPROBLEMS - WARNING SIGNS – LOSE THE ‘MISTER DUPLICATER’ ‘DUPLICATE ALL THE THINGS’
- 60. IMPROVE SITE PERFORMANCE- HELP GOOGLEBOTGET THROUGH THE ‘BUCKET LIST’ – GET FAST AND RELIABLE Avoid wasting time on ‘overdue-‐URL’ crawling (E.G. Send correct response codes, speed up your site, etc) 8,666,964 B1 ½ time > 2 x page crawl p/day Added to Cloudflare CDN
- 61. GOOGLEBOT GOES WHERE THE ACTION IS USE ‘ACTION’ WISELY DON’T TRY TO TRICK GOOGLEBOT BY FAKING ‘FRESHNESS’ ON LOW IMPORTANCE PAGES – GOOGLEBOT WILL REALISE UPDATE IMPORTANT PAGES OFTEN NURTURE SEASONAL URLs TO GROW IMPORTANCE WITH FRESHNESS (regular updates) & MATURITY (HISTORY) DON’T TURN GOOGLEBOT’S HEAD INTO THE WRONG PLACES Image Credit: Buzzfeed ’GET FRESH’AND STAY ‘FRESH’ ‘BUT DON’T TRY TO FAKE FRESH & USE FRESH WISELY’
- 62. IMPROVE TO GETTHE HARD LIMITS ON CRAWLING By improving your URL importance on an ongoing basis via Increased pagerank, content improvements (e.g. quality hub pages), internal link strategies, IB (P), restructuring, You can get the ‘hard limit’ or get visited more generally CAN IMPROVING YOUR SITE HELP TO ‘OVERRIDE’ SOFT LIMIT CRAWL PERIODS SET?
- 63. YOU THINK ITDOESN’T MATTER… RIGHT? YOU SAY… ” GOOGLE WILL WORK IT OUT” ”LET’S JUST MAKE MORE CONTENT”
- 64. WRONG – ‘CRAWL TANK’ IS UGLY
- 65. WRONG – CRAWL TANK CAN LOOK LIKE THIS SITE SEO DEATH BY TOO MANY URLS AND INSUFFICIENT CRAWL BUDGET TO SUPPORT (EITHER DUMPING A NEW ‘THIN’ PARAMETER INTO A SITE OR INFINITE LOOP (CODING ERROR) (SPIDER TRAP)) WHAT’S WORSE THAN AN INFINITE LOOP? ‘A LOGICAL INFINITE LOOP’ IMPORTANCE DISTORTED BY BADLY CODED PARAMETERS GENERATING ‘JUNK’ OR EVEN WORSE PULLING LOGIC TO CRAWLERS BUT NOT HUMANS
- 66. WRONG – SITE DROWNED -IN IT’S OWN SEA OF UNIMPORTANT URLS
- 67. VIA ‘EXPONENTIAL URL UNIMPORTANCE’ Your URLs exponentially confirmed unimportant with each iterative crawl visit to other similar or duplicate content checksum URLs. Fewer and fewer internal links and ‘thinner and thinner’ relevant content. MULTPLE RANDOM URLs competing for same query confirm irrelevance of all competing in-‐site URLs with no dominant single relevant IMPORTANT URL
- 68. WRONG – ‘SENDING WRONG SIGNALS TO GOOGLEBOT’ COSTS DEARLY (Source:Sistrix) “2015 was the year where website owners managed to be mostly at fault, all by themselves” (Sistrix 2015 Organic Search Review -‐ 2016)
- 69. WRONG - NO-ONE IS EXEMPT (Source:Sistrix) “It doesn’t matter how big your brand is if you ‘talk to the spider’ (Googlebot) wrong ” – You can still ‘tank’
- 70. WRONG – GOOGLE THINKS SEOS SHOULD UNDERSTAND CRAWL BUDGET
- 71. ”EMPHASISE IMPORTANCE” “Make sure the right URLs get on Googlebot’s menu and increase URL importance to build Googlebot’s appetite for your site more” Dawn Anderson @ dawnieando SORT OUT CRAWLING
- 72. TWITTER -‐ @dawnieando GOOGLE+ -‐ +DawnAnderson888 LINKEDIN -‐ msdawnanderson THANK YOU Dawn Anderson @ dawnieando
- 73. • Going ‘where the action is’ in sites • The ‘need for speed’ • Logical structure • Correct ‘response’ codes • XML sitemaps with important URLs • ‘Successful crawl visits • ‘Seeing everything’ on a page • Taking MAX ‘hints’ • Clear unique single ‘URL fingerprints’ (no duplicates) • Predicting likelihood of ‘future change’ • Finding ‘more’ important content worth crawling • Slow sites • Too many redirects • Being bored (Meh) (Min ‘Hints’ are built in by the search engine systems – Takes ‘hints’) • Being lied to (e.g. On XML sitemap priorities) • Crawl traps and dead ends • Going round in circles (Infinite loops) • Spam URLs • Crawl wasting minor content change URLs • ‘Hidden’ and blocked content • Uncrawlable URLs Not just any change Critical material change Predicting future change Dropping ‘hints’ to Googlebot Sending Googlebot Where ‘the action is’ Not just page change designed To catch Googlebot’s eye with No added value UNDERSTAND GOOGLEBOT & URL SCHEDULER - LIKES & DISLIKES LIKES DISLIKES CHANGE IS KEY
- 74. Going ‘where the action is’ in sites The ‘need for speed’ Logical structure Correct ‘response’ codes XML sitemaps ‘Successful crawl visits ‘Seeing everything’ on a page Taking ‘hints’ Clear unique single ‘URL fingerprints’ (no duplicates) Predicting likelihood of ‘future change’ Slow sites Too many redirects Being bored (Meh) (‘Hints’ are built in by the search engine systems – Takes ‘hints’) Being lied to (e.g. On XML sitemap priorities) Crawl traps and dead ends Going round in circles (Infinite loops) Spam URLs Crawl wasting minor content change URLs ‘Hidden’ and blocked content Uncrawlable URLs Not just any change Critical material change Predicting future change Dropping ‘hints’ to Googlebot Sending Googlebot Where ‘the action is’ CRAWL OPTIMISATION – STAGE 1 - UNDERSTAND GOOGLEBOT & URL SCHEDULER - LIKES & DISLIKES LIKES DISLIKES CHANGE IS KEY
- 75. FIX GOOGLEBOT’S JOURNEY SPEED UPYOUR SITE TO ‘FEED’ GOOGLEBOT MORE TECHNICAL ‘FIXES’ Speed up your site Implement compression, minification, caching ‘ Fix incorrect header response codes Fix nonsensical ‘infinite loops’ generated by database driven parameters or ‘looping’ relative URLs Use absolute versus relative internal links Ensure no parts of content is blocked from crawlers (e.g. in carousels, concertinas and tabbed content Ensure no css or javascript files are blocked from crawlers Unpick 301 redirect chains Consider using a CDN such as Cloudflare IMPLEMENTATION OF CONTENT DELIVERY NETWORK
- 76. Minimise 301 redirects Minimise canonicalisation Use ‘if modified’ headers on low importance ‘hygiene’ pages Use ‘expires after’ headers on content with short shelf live (e.g. auctions, job sites, event sites) Noindex low search volume or near duplicate URLs (use noindex directive on robots.txt) Use 410 ‘gone’ headers on dead URLs liberally Revisit .htaccess file and review legacy pattern matched 301 redirects Combine CSS and javascript files Use minification, compression and caching FIX GOOGLEBOT’S JOURNEY SAVE BUDGET / EMPHASISE IMPORTANCE £
- 77. Revisit ‘Votes for self’ via internal links in GSC Clear ‘unique’ URL fingerprints Improve whole site sections / categories Use XML sitemaps for your important URLs (don’t put everything on it) Use ‘mega menus’ (very selectively) to key pages Use ‘breadcrumbs’ Build ‘bridges’ and ‘shortcuts’ via html sitemaps and ‘cross modular’ ‘related’ internal linking to key pages Consolidate (merge) important but similar content (e.g. merge FAQs or ‘low search volume’ content into other relevant pages) Consider flattening your site structure so ‘importance’ flows further Reduce internal linking to lower priority URLs BE CLEAR TO GOOGLEBOT WHICH ARE YOUR MOST IMPORTANT PAGES Not just any change – Critical material change Keep the ‘action’ in the key areas -‐ NOT JUST THE BLOG Use ‘relevant ‘supplementary content to keep key pages ‘fresh’ Remember min crawl ‘hints’ Regularly update key IMPORTANT content Consider ‘updating’ rather than replacing seasonal content URLs (e.g. annual events). Append and update. Build ‘dynamism’ and ‘interactivity’ into your web development (sites that ‘move’ win) Keep working to improve and make your URLs more important GOOGLEBOT GOES WHERE THE ACTION IS AND IS LIKELY TO BE IN THE FUTURE (AS LONG AS THOSE URLS ARE NOT UNIMPORTANT) TRAIN GOOGLEBOT – ‘TALK TO THE SPIDER’ (PROMOTE URLS TO HIGHER CRAWL LAYERS) EMPHASISE PAGE IMPORTANCE TRAIN ON CHANGE
- 78. SAVINGS, CHANGE &SPEED TOOLS • GSC Index levels (over indexation checks) • GSC Crawl stats • Last Accessed Tools (versus competitors) • Server logs • Keyword Tools SAVINGS & CHANGE SPEED • Yslow • Pingdom • Google Page Speed Tests • Minificiation – JS Compress and CSS Minifier • Image Compression – Compressjpeg.com, tinypng.com • Content Delivery Networks (e.g. Cloudflare)
- 79. URL IMPORTANCE &CRAWL FREQUENCY TOOLS • GSC Internal links Report (URL importance) • Link Research Tools (Strongest sub pages reports) • GSC Internal links (add site categories and sections as additional profiles) • Powermapper • XML Sitemap Generators for custom sitemaps • Crawl Frequency Clocking (@Johnmu) URL IMPORTANCE
- 80. SPIDER EYES TOOLS •GSC Crawl Stats • URL Profiler • Deepcrawl • Screaming Frog • Server Logs • SEMRush (auditing tools) • Webconfs (header responses / similarity checker) • Powermapper (birds eye view of site) • Lynx Browser • Crawl Frequency Clocking (@Johnmu) SPIDER EYES
- 81. REFERENCES Efficient Crawling Through URL Ordering (Page et al) -‐ http://oak.cs.ucla.edu/~cho/papers/cho-‐order.pdf Crawl Optimisation (Blind Five Year Old – A J Kohn -‐ @ajkohn) http://www.blindfiveyearold.com/crawl-‐ optimization Scheduling a recrawl (Auerbach) -‐ http://www.google.co.uk/patents/US8386459 Scheduler for search engine crawler (Zhu et al) -‐ http://www.google.co.uk/patents/US8042112 Efficient crawling through URL ordering (Page et al) -‐ http://oak.cs.ucla.edu/~cho/papers/cho-‐order.pdf Google Explains Why The Search Console Reporting Is Not Real Time (SERoundtable) https://www.seroundtable.com/google-‐explains-‐why-‐the-‐search-‐console-‐has-‐reporting-‐delays-‐21688.html Crawl Data Aggregation Propagation (Mueller) -‐ https://goo.gl/1pToL8 Matt Cutts Interviewed By Eric Enge -‐ https://www.stonetemple.com/matt-‐cutts-‐interviewed-‐by-‐eric-‐enge-‐ 2/ Web Promo Q and A with Google’s Andrev Lippatsev -‐ https://searchenginewatch.com/2016/04/06/webpromos-‐qa-‐with-‐googles-‐andrey-‐lipattsev-‐transcript/ Google Number 1 SEO Advice – Be Consistent -‐ https://www.seroundtable.com/google-‐number-‐one-‐seo-‐ advice-‐be-‐consistent-‐21196.html
- 82. REFERENCES Internet Live Stats -‐ http://www.internetlivestats.com/total-‐number-‐of-‐websites/ Scheduler for search engine crawler Google Patent US 8042112 B1, (Zhu et al) -‐ https://www.google.com/patents/US8707313 Managing items in crawl schedule – Google Patent (Alpert) http://www.google.ch/patents/US8666964 Document reuse in a search engine crawler -‐ Google Patent (Zhu et al) https://www.google.com/patents/US8707312 Web crawler scheduler that utilizes sitemaps (Brawer et al) -‐ http://www.google.com/patents/US8037054 Distributed crawling of hyperlinked documents (Dean et al) -‐ http://www.google.co.uk/patents/US7305610 Minimizing visibility of stale content (Carver) -‐ http://www.google.ch/patents/US20130226897
- 83.