Secret Facebook's system architecture

Web front end is written in PHP. Facebook's HipHop [1] will turn into a C + + PHP and use g + + compiler,PULSERA NEGRA CON ARGENTINA, so that templates can commemorate the business logic membrane and the Web to cater lofty extravaganza.
Service affair logic in the manner, the use of Thrift [2]. The Service along to the different absences of the PHP, C + + alternatively Java implementation (you can too use a number of additional languages, ...) written in Java and Services does no use anyone corporation petition server, merely use a Facebook own custom applications server. Looks favor it re-invent the cycle, but these are merely exposed to the Thrift Services use (the number namely so vast), Tomcat namely also heavy,Balance arriesgado, and may even be also Jetty point, the added merit needed to Facebook does no make sense. Persistence along the MySQL, Memcached [3], Facebook's Cassandra [4], Hadoop's HBase [5] completed. Memcached uses a MySQL memories Cache. Cassandra Facebook engineers confess that their use is decreasing, for they choose HBase, because it's simpler consistency prototype to its MapReduce skill. Offline processing using Hadoop and Hive. Log, press,PULSERA TRANSPARENTE CON BANDERA, feeds file to use Scribe [6], its aggregation and there HDFS, its use Scribe-HDFS [7],Extreme Balance, allowing the use of MapReduce as stretched analysis. BigPipe [8] is their custom technology used to scale up sheet display. Varnish Cache [9] as a HTTP surrogate. They use this because of speed and efficiency. [10]. Gaoding users to upload one billion photos stored, its treatment along the Haystack, Facebook has developed its own Ad-Hoc cache a agenda, its effectively to do some low-level optimization and the ]. Facebook Messages with their own architecture, its clearly built above a dynamic bunch infrastructure. Business logic and patience are encapsulated in a so-called 'Cell'. Each 'Cell' are handled as chapter of the consumer, the new 'Cell' tin be added as way Redu [12]. Persistent archive using HBase [13]. Facebook Messages are stored in the search engines by the HBase one inverted concordance construction. [14] Facebook search engine implementation details as distant as I know the current status is unknown. Typeahead search using a custom arsenal and recovery logic. [15] Chat based above a Epoll server, the server amplified in Erlang,PULSERA BLANCA CON NETHERLANDS, the Thrift way [16]
afford to the components on those resources, the emulating is some message and amount, but there are some unknown :
Facebook is estimated that extra than 60,000 servers [16]. Their latest data center in Oregon Prineville, its completely custom chart based on hardware [17] it was only recently publicly Open Compute project [18]. 300 TB of data exists to handle with Memcached [19] their Hadoop and Hive clusters formed by the 3000 servers, every server has 8 kernels, 32GB of memory,PULSERA BLANCE CON ESPANA, 12TB of disk, always have 24,000-CPU-core, 96TB 36PB of memory and hard drive. [20] 100 billion a daytime volume of hits, 500 million photos, 100 billion hits per day, 50 billion photos, 3 万亿 objects are Cache, daily 130TB of record (July 2010 data) [21 ]
references
[1] HipHop for PHP: http://developers.facebook.com/blog/post/358
[2] Thrift: http:/ / thrift.apache.org /
[3] Memcached: http://memcached.org/
[4] Cassandra: http://cassandra.apache.org/
[5] HBase: http://hbase.apache.org/
[6] Scribe: https://github.com/facebook/scribe
[7] Scribe-HDFS: http://hadoopblog.blogspot.com/2009/06/hdfs-scribe-integration.html
[8] BigPipe: http://www.facebook.com / notes/facebook-engineering/bigpipe-pipelining-web-pages-for-high-performance/389414033919
[9] Varnish Cache: http://www.varnish-cache.org/
[10] Facebook goes for Varnish: http://www.varnish-software.com/customers/facebook
[11] Needle in a haystack: efficient storage of billions of photos: http : / / www.facebook.com/note.php?note_id=76191543919
[12] Scaling the Messages Application Back End: http://www.facebook.com/note.php?note_id=10150148835363920
[13] The Underlying Technology of Messages: https://www.facebook.com/note.php?note_id=454991608919
[14] The Underlying Technology of Messages Tech Talk: ; http://www.facebook.com/video/video.php?v=690851516105
[15] Facebook's typeahead search architecture: http://www.facebook.com/video/video.php ? v = 432864835468
[16] Facebook Chat: http://www.facebook.com/note.php?note_id=14218138919
[17] Who has the most Web Servers?: http://www.datacenterknowledge.com/archives/2009/05/14/whos-got-the-most-web-servers/
[18] Building Efficient Data Centers with the Open Compute Project: http://www.facebook.com/note.php?note_id=10150144039563920
[19] Open Compute Project: http://opencompute.org/
[20] Facebook's structure introduction by Devoxx 2010: http://www.devoxx.com
[21] Scaling Facebook to 500 millions users and beyond: http://www.facebook.com/note.php?note_id = 409 881 258 919

BEIJING, Nov. 17
AFP,coach sunglasses, 7 Papua New Guinea in the Pacific Ocean were rescued after drifting more than in February,chanel sunglasses, but 2 of them died after being rescued, there are 5 survivors.
According to reports, on Sunday, one from the United States fishing vessel Boat 22 feet long, containing seven dying man. Upon seeing this boat then rescued seven men.
Pacific island near the Marshall Islands capital of Majuro Island You Lijia, a shipping company official said that seven men in a 5 hours on Sunday after being rescued died, and another 1 rescued man also died at 17. This means that there are still five survivors. In fact, in addition to the 7 people on board also had the first eight passengers, is a now 17-year-old boy. He was at sea on Friday by strong waves and storm washed away, now dead or alive.
7 people were rescued, the result of extreme weakness, Is not known they drift up to 2 months of life,prada sunglass, relies on what diet to survive.
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However, this would have ended the day excursions can ship the oil but because of the depletion of emergent accident. They drift to the northeast, and spent at sea for up to 2 months time.
expected 2 months drifting life so that they are very sensitive to light,sunglasses for men, and showed signs of extreme malnutrition.
Maughan said the captain,ray ban sunglasses, the survivors drifted at sea for 2 months time, fishing boats have been seen several times, but those boats are