资源描述：
《Memcached Study.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、Memcachedhttp://download.tangent.org/talks/Memcached%20Study.pdfThursday,April23,2009memcachedisahigh-performance,distributedmemoryobjectcachingsystem,genericinnature,butintendedforuseinspeedingupdynamicwebapplicationsbyalleviatingdatabaseload.Thursday,A
2、pril23,2009Who?•Facebook•Yahoo•Amazon•LiveJournal•Mixi•...Thursday,April23,2009Why?(akawhywouldI...)Thursday,April23,2009Thursday,April23,2009LiveJournal•Originofmemcached•30Gofcache.Terabytesofdata•WritestoDBbasedonreadsfromtheDB,notcacheThursday,April2
3、3,2009Mixi•Memcachedondedicatedservers•300serversinproduction(reuseoldMySQLServers)•4/8gigsofMemory•15,000qps/400MbpsthroughputThursday,April23,2009Thursday,April23,2009PatrickLenzEins.dehttp://poocs.netThursday,April23,2009GrazrThursday,April23,2009100+
4、Nodes2gigsaNodeProcessingIncomingDataMemcachedThursday,April23,2009HowThursday,April23,2009Server•SlabAllocator•Libeventbased•SimpleProtocol(noxml)•ServerhasInternalHashTable•ServersknownothingabouteachotherThursday,April23,2009Clients•ClienthashesKeytoS
5、erverList(distribution)•SerializestheObject(serverjustlikesbytearrays)•CompressesdataThursday,April23,2009ConsistentHashThursday,April23,2009SowhatshouldIask?•HowdoIdumpdata?•Howisitredundant?*•Howdoesithandlefailover?*•Howdoesitauthenticate?Thursday,Apr
6、il23,2009DetailsontheServer?•set/get/replace/add•append/prepend•increment/decrement•cas(compareandswapatomic!)•stats(detail)Thursday,April23,2009Platforms•FreeBSDandLinuxaretoptier•Windowsexists•Solaris(asof1.2.5)•OSXGoodSupportThursday,April23,2009Examp
7、lesThursday,April23,2009RubyThursday,April23,2009#Setupclientobjectrequire'memcache'servers=['127.0.0.1:43042','127.0.0.1:43043']CACHE=MemCache.new(servers,:namespace=>'my_app')Thursday,April23,2009#Get;fallthroughtoRails'MySQLloadifmissingkey="recent_po
8、sts"#Trytoget;returnsnilonfailureposts=CACHE.get(key)unlessposts#LoadfromDBposts=Post.find(:all,:limit=>10,:order=>'idDESC')#Cachethenewvalue,whichisautomaticallyserializedCACHE.set(key),posts,60endThursday,April23,2009#Ghe
