Web scraping in Java/Scala -


i need extract keywords, title , description of long list of urls (initially ~250,000 urls per day , ~15,000,000 urls per day)

how recommend executing this? preferably , solution extended 15,000,000 events per day. preferably in scala or java

so far i've looked at:

  • spray - i'm not familiar spray yet can't quite evaluate it. useful framework task?
  • vertx - i've worked vertx before, if framework explain how best way implement vertx?
  • scala scraper - not familiar @ all. framework use case , loads need?
  • nutch - i'm not sure how if want use inside code. i'm not sure need solr usecase. had experience it?

i'll happy hear of other options if think they're better

i know can dig in each of these solution , decide whether it's or not there seem many options direction appreciated.

thanks in advance

we use stormcrawler our search engine, stolencamerafinder. it's in java , i've clocked fetching on 4 million urls per day politeness setting of 1 url per second per host. bottleneck wasn't stormcrawler url diversity. per host part important, never fetch more 1 url per second each host (technically leaves 1 second rest between fetches). example, if had 60 urls yahoo.com/* , 100 million flickr.com/* still never exceed 120/min.

you can index data straight elasticsearch , works well. stormcrawler has hooks right should able running quite easily.


Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more