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1. Geode

2016Äê11ÔÂ21ÈÕ£¬Apache Èí¼þ»ù½ð»á£¨ASF£©Ðû²¼ Apache? Geode? ÒÑ´Ó Apache ·õ»¯Æ÷±ÏÒµ³ÉΪ¶¥¼¶ÏîÄ¿£¨TLP£©£¬±íÃ÷¸ÃÏîÄ¿µÄÉçÇøºÍ²úÆ·ÒѸù¾Ý ASF µÄ¾«Ó¢Á÷³ÌºÍÔ­ÔòµÃµ½Á¼ºÃ¹ÜÀí¡£

Apache Geode ÊÇÒ»¸öÊý¾Ý¹ÜÀíÆ½Ì¨£¬ÌṩʵʱµÄ¡¢Ò»Öµġ¢¹á´©Õû¸öÔÆ¼Ü¹¹µØ·ÃÎÊÊý¾Ý¹Ø¼üÐÍÓ¦Óã¬×î³õÓÉ GemStone Systems ¹«Ë¾¿ª·¢£¬É̱êΪ GemFire¡£ ´ËÏî¼¼Êõ³õÆÚ±»¹ã·ºÓ¦ÓÃÔÚ½ðÈÚÁìÓò£¬ÓÃÓÚ»ª¶û½Ö½»Òׯ½Ì¨£¬×÷ΪÊÂÎñÐÔ¡¢ µÍÑÓʱµÄÊý¾ÝÒýÇæ¡£2015Äê4Ô½«´úÂëÌá½»¸ø Apache ·õ»¯Æ÷×÷Ϊ·õ»¯ÏîÄ¿¡£Ä¿Ç° Apache Geode Óг¬¹ý600¼Ò´óÖÐÐÍÆóÒµ¼¶Óû§, Ö÷ÒªÊDZØÐëÂú×ãµÍÑÓʱºÍ24x7 ¸ß¿É¿¿ÒªÇóµÄ£¬¸ß¿ÉÀ©Õ¹µÄ¹Ø¼üÒµÎñÓ¦ÓÃϵͳ¡£

2. ÊÊÓó¡¾°

¿ÉÒԲο¼ÉÏÎÄ£¬·Ö²¼Ê½»º´æÀûÆ÷-Gemfire.

4¸öÖ÷ҪʹÓó¡¾°£º

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½»Ò×´¦Àí£¨Transaction£©£¬²ÉÓÃ×îÖÕÒ»ÖÂÐÔ

Geode ³Ø»¯ÁË·þÎñÆ÷ÉϵÄÄÚ´æ, CPU, ÍøÂç×ÊÔ´, ºÍ±¾µØ´ÅÅÌ£¬¿ç¶à¸ö½ø³ÌÀ´¹ÜÀíÓ¦ÓöÔÏóºÍÐÐΪ. ËüʹÓÃÁ˶¯Ì¬Êý¾Ý¸´ÖƺͷÖÇø¼¼ÊõÀ´ÊµÏָ߿ÉÓÃ, ¸ßÐÔÄÜ, ¸ß¿ÉÀ©Õ¹ÐÔ, ºÍÈÝ´í. ÁíÍâ, ¶ÔÓÚÒ»¸ö·Ö²¼Ê½Êý¾ÝÈÝÆ÷, Apache Geode ÊÇÒ»¸ö»ùÓÚÄÚ´æµÄÊý¾Ý¹ÜÀíϵͳ, ÌṩÁ˿ɿ¿µÄÒ첽ʼþ֪ͨºÍ¿É¿¿µÄÏûϢͶµÝ.

3. Êý¾Ý½á¹¹Ô´Âë

ÈçÉÏÎÄËù˵£¬ÏµÍ³Ä¿Ç°Óöµ½Ò»¸ö·Ö²¼Ê½ÏµÍ³Òì³£¸´ÔÓÖ®ÄÑÌ⣬Äѵ½²»±éÀúÔ´ÂëÎÞ·¨½â¿ªÃÕÌâµÄµØ²½¡£×¢Ò⣬±ÊÕßд´ËÎÄʱ£¬´ËÄÑÌâÉÐÎ޴𰸣¬ÎÒÃÇÏ£Íûµ±´ËÎÄ·¢²¼Ê±£¬ÒÑÓнâÒ©¡£

ÁíÍ⣬ǿÁÒ½¨Òé¿´¹ÙÏÈ×ÔÐÐÁ˽âGemfire¹¦ÄÜÒÔ¼°²¿·ÖÔ­Àí£¬·ñÔò´ËÎĽÏΪ³ÔÁ¦¡£

3.1 Region

½øÈëÕýÌ⣬ÏÈÀ´¿´Ò»ÏºËÐÄÀàRegion¡£

Region¼Ì³ÐJavaµÄConcurrentMap£¬ÊµÏÖÁË·Ö²¼Ê½K,VµÄHashMap£¬²¢ÌṩÁ˸߽׵ÄÊÂÎñ£¬Persistence£¬·ÖÇøµÈ·Ö²¼Ê½¹¦ÄÜ¡£

½Ó¿Ú¼Ì³ÐMapµÄget, putÎÞÐë¶à˵£¬¿´¼¸¸ö±È½ÏÖØÒªµÄ¡£

GeodeµÄRegion¿ÉÒÔÏñÊ÷ÐÎÒ»Ñù£¬ÐγÉÒ»ÖÖHierarchy½á¹¹Ç¶Ì×£¬Ê¹Óá±/¡±À´·Ö¸ô¶à¸ö×ÓRegion.ËùÒÔÓÐÏòÉÏ»ñÈ¡¸¸Ç×£¬×ÔȻҲÓÐÏòϵ¼º½»ñÈ¡×ÓÅ®£ºgetSubregion(String path)

RegionDistributedLock

µÚÒ»¸ö·Ö²¼Ê½Ëø£¬È«¾ÖRegion¡£×¢ÊÍдºÜµ½Î»£¬ÆäÖÐÌáµ½µ±region´´½¨Ê±»á×Ô¶¯¿ªÆôÈ«¾ÖregionËø£¬ËùÓжÔregion¼¶±ðµÄ²Ù×÷£¬ÈçinvalidateRegion, destroyRegionÒ²¿ÉÄÜ»á×Ô¶¯Óõ½region¼¶±ðËø£¬Õâ¸öô¿ÉÒÔÀí½â£¬±Ï¾¹ÊÇÖØÁ¿¼¶²Ù×÷¡£

getDistributedLock£¨key£©

ÌṩÁ˸üϸÁ£¶ÈµÄregion¼¶±ð·Ö²¼Ê½Ëø¿ØÖÆ¡£

È»¶ø£¬³ý·Ç±ØÒª£¬ËùÓзֲ¼Ê½²Ù×÷²»½¨ÒéÓÃÈç´ËÖ®ÖØµÄËø£¬·ñÔòºó»¼ÎÞÇî¡£

public void writeToDisk();

µ±È»£¬Ö§³Ö³Ö¾Ã»¯µ½´ÅÅÌ£¬·Ö²¼Ê½µÄÒ»ÖÖ±íÏÖÐÎʽ£¬Ïà¶ÔÓÚÆÕͨµÄHashMap¡£

public void becomeLockGrantor();

²»×¸Êö£¬Èç×¢ÊÍËùÃèÊö£¬LockServiceµÄµ£±££¬Ç°Ìᵱǰregion±ØÐëÊÇGlobalÀàÐÍ£¬ÓеãÀàËÆ¶ÔÓÚ·Ö²¼Ê½È«¾Ö±äÁ¿¼ÓËø£¬ËùÒÔÿµ±µ÷Óô˷½·¨£¬Ï߳̽«×èÈûÖ±µ½µ£±£±»×ªÒƵ½µ±Ç°member¡£

³¬¼¶ÖØÁ¿¼¶·½·¨£¬Çë×Ô±£¡£×¢ÊÍÇ¿µ÷ÁË£¬Ï໥µ÷ÓÿÉÄÜÔì³ÉËÀËø£¬ËµµÄ±È½ÏίÍñ£¬back and force¡£

public void registerInterest(K key);

ºóÐøºÜ¶à·Ö²¼Ê½£¬¶à¸ömember½»»¥µÄÈë¿ÚÖ®Ò»¡£

×¢ÊÍÌáµ½ÓÃÓÚÏòCacheServerÌá½»×¢²áÒ»¸ö¸ÐÐËȤµÄkey£¬ºóÐø»¹Óа´ÕÕÕýÔò±í´ïʽע²á£¬»òÕß×¢²áËùÓÐkey¡£Æä×¢²áÄ¿µÄÊÇÓÃÓÚ±»Í¨Öª£¬ÀàËÆems queueµÄsubscription¹¦ÄÜ£¬»òÕ߻ص÷֪ͨ¡£

public List getInterestList();

·µ»Øµ±Ç°regionÒѾ­×¢²áµÄËùÓиÐÐËȤkey¡£

¶ÔÁË£¬Ã¿¸öÀà´úÂëСÓÚ500Ðж¼ÊÇÆ­È˵ģ¬Ëæ±ã¿´¿´ÕâЩ¿ªÔ´´úÂ룬ÉÙÔò1000£¬¶àÔò6-7ǧÐдúÂë¡£

3.2 AbstractRegion

AbstractRegion³éÏóÀ࣬Ö÷Òª·âװʵÏÖÁ˹ØÓÚRegionAttributes, AttributesMutator, and some no-brainer method implementations¡£

ÆäÖУ¬Ö÷Òªcache²Ù×÷µÄ¶ÁдÔòÓÉÉÏÃæloaderÓëwriter´úÀíʵÏÖ¡£Usually there will be only one CacheWriter in the distributed system.ËùÒÔ£¬Í¨³£Õû¸ö·Ö²¼Ê½ÏµÍ³Ö»ÓÐÒ»¸öcache writer£¬ÆäËüÌØÊâÇé¿öÔÝʱ²»Ìá¡£

½Ø»ñentry¸üÐÂʼþ£¬ÆäÖÐentryEvent°üº¬ÁËÕû¸ö²Ù×÷µÄÐÅÏ¢£¬ÈçKeyInfo, EventID, newValue, oldValue, Operation, originated memberµÈ¡£BTW, Õâ¸ö¿´ÆðÀ´ÆÕͨµÄEntryEventÀàÒ²ÓÐ2856ÐУ¬´Ë´¦Ê¡ÂÔÎÞÊý¡£¡£¡£

protected Set asyncEventQueueIds;

ÒþÒþ¾õµÃ£¬Æä·Ö²¼Ê½µÄÏûϢʼþ´¦Àí»á·Åµ½queueÖУ¬ÕâÀïÓÃÁËset½á¹¹£¬ÎÒÃǼÌÐø¿´ÏÂÈ¥¡£

protected booleanenableSubscriptionConflation;

Õâ¸ö²ÎÊý¶ÔÓÚ¸ßÆµÐ´region·Ç³£ÓÐÓã¬Ö÷ÒªÊÇͬһ¸ökey¸ßËÙд£¬ÀàËÆÊµÊ±±¨¼Û¡£Õâ¸ö²ÎÊýЧ¹ûÀàËÆÓÚLeaky Bucke¡£

©ͰËã·¨(Leaky Bucket)ÊÇÍøÂçÊÀ½çÖÐÁ÷Á¿ÕûÐΣ¨Traffic Shaping£©»òËÙÂÊÏÞÖÆ£¨Rate Limiting£©Ê±¾­³£Ê¹ÓõÄÒ»ÖÖËã·¨£¬ËüµÄÖ÷ҪĿµÄÊÇ¿ØÖÆÊý¾Ý×¢Èëµ½ÍøÂçµÄËÙÂÊ£¬Æ½»¬ÍøÂçÉϵÄÍ»·¢Á÷Á¿¡£Â©Í°Ëã·¨ÌṩÁËÒ»ÖÖ»úÖÆ£¬Í¨¹ýËü£¬Í»·¢Á÷Á¿¿ÉÒÔ±»ÕûÐÎÒÔ±ãÎªÍøÂçÌṩһ¸öÎȶ¨µÄÁ÷Á¿¡£Â©Í°¿ÉÒÔ¿´×÷ÊÇÒ»¸ö´øÓг£Á¿·þÎñʱ¼äµÄµ¥·þÎñÆ÷¶ÓÁУ¬Èç¹û©Ͱ£¨°ü»º´æ£©Òç³ö£¬ÄÇôÊý¾Ý°ü»á±»¶ªÆú¡£

3.3 Regions UML

µ±ÎÒÃÇÔ½¼ÓÉîÈ룬·¢ÏÖ´úÂëÔ½À´Ô½¸´ÔÓ£¬ºÜ¶àÀàÉÙÔò¼¸Ç§£¬¶àÔòÉÏÍòÐУ¬ÀàÒ²ÓÐÉÏǧÍò¸ö£¬¶ÔÓÚ´óÐÍ¿ªÔ´ÏîÄ¿£¬»¹ÊÇÀ´Ò»ÕÅÀàͼ°É£¬ÕÆÎÕÕûÌåºê¹ÛºÜÖØÒª¡£

¿ÉÒÔ¿´µ½LocalRegion¼Ì³Ð×ÔAbstractRegion£¬×îÖØÒªµÄÊÇÄÚ²¿·â×°ÁËRegionµÄÊý¾Ý½á¹¹¡£

Á˽âHashMapÄÚ²¿Êý¾Ý½á¹¹µÄÅóÓÑÓ¦¸ÃÖªµÀ£¬ÆäÄÚ²¿ÎªÊý×é+Á´±í×éºÏµÄ¶þά¿Õ¼ä£»Í¬Àí£¬GeodeµÄRegionÄÚ²¿Êý¾Ý½á¹¹ÔòÓÉRegionMapÀ´³éÏ󣬳ÖÓÐÕæÕýµÄÊý¾Ý£¬¶ø¾¿ÆäÄÚ²¿ÔòÊÇÄÚÖÃÁËÒ»¸öConcurrentHashMap£¬ÏëÏëÈÃÎÒÃÇÀ´Éè¼ÆµÄ»°Ò²´ó¸ÅÈç´Ë°É¡£

3.4 AbstractRegionMap

¿ÉÒÔ¿´µ½ÀïÃæÄÚÖÃÒ»¸öCustomEntryConcurrentHashMap map£»Ó¦¸ÃÊÇÕâ¸ömap, ÕâÊÇʲôÉñÆ÷£¿

Èç¹ûÄã¿´µ½ÁËDoug LeaµÄ´óÃû£¬²»Òª¾ªÆæ£¬ÄѵÀDougҲΪGemfire/Geode²Ùµ¶£¿·ÇÒ²¡£

Gemfire/Geodeµ±ÄêÖ±½Ócopy DougÀÏÈ˼ҵÄConcurrentHashMap, Äã¿ÉÒÔÈ¥±È½ÏÒ»ÏÂÔ´Â룬µ±È»£¬GemStoneÒ²½øÐÐÁËһЩ¶¨ÖÆ»¯£¬Èç¶ÁËøµÈ¡£

Á˽âÍêÆäÕæÊµÄÚ²¿´æ´¢Êý¾Ý½á¹¹ºó£¬ÐÄÖÐÂÔÓÐÒ»¶þ£¬¶øÈ»ÕâÒ²ÊÇÔ¤ÆÚÖ®ÖУ¬ÎÒÃǼÌÐø¿´ÈçºÎʵÏÖ·Ö²¼Ê½µÄ¾«Ëè¡£

3.5 DistributedRegion

ÎÒÃÇ»¹ÊÇÏÈÉÏUMLͼ°É¡£

DistributinRegion´ú±íÁË·Ö²¼Ê½µÄReplicatedRegion, ¶øÆäÖÐÔòÊÇ¿¿CacheDistributionAdvisorÀ´°ïæ¸ú×Ù±£³ÖÊý¾Ýͬ²½µÄ¡£

3.6 Partitioned Regions

Partitioned RegionΪPatitionedRegionµÄʵÀý»¯£¬ÄÚ²¿Ôò»ùÓÚkeyµÄhash codeÀ´¼ì²â¶¨Î»Bucket¡£

PartitionedRegion£¬GeodeÖеĺËÐÄ·Ö²¼Ê½½á¹¹¡£Í¨¹ýhashËã·¨£¨¿ÉÒÔ×Ô¶¨Ò壩À´°ÑkeyÓ³Éäµ½ÏàÓ¦µÄbucket´Ó¶ø´ïµ½·Ö²¼Ê½´æ´¢£¬²¢ÌṩroutingÏûÏ¢µ½ÏàÓ¦µÄbucket¡£

PartionedRegionÖеÄPartitionedRegionDataStoreÔòʵ¼Ê¸ºÔð·Ö²¼Ê½¹ÜÀíbucket£¬ÒÔ¼°´æ´¢¡£

PRHARedundancyProvider

ÀàÈçÆäÃû:

Ö÷ÒªÌṩÕë¶ÔReduancy CopyµÄ¹ÜÀí£¬°üÀ¨£º

bucket´´½¨£¬ÒÔ¼°nodeµÄ¹ÜÀí¡£

µ±´´½¨²¢ÅäbucketµÄʱºò£¬ÆäÄÚ²¿´´½¨³öBucketRegionµÄʵÀý, À´¿´Ò»ÏÂBucketRegionÖо­µäµÄvirtualPut:

×¢Êͺܺã¬

Èç¹ûµ±Ç°ÊÇPrimary, Ôòop locally, Ö®ºó·Ö·¢²Ù×÷opµ½secondaries¼°bridge server£¬Í¬Ê±cache listernerͬ²½Æä½á¹û£»

·´Ö®£¬ÔòÊ×ÏÈop locally£¬Ö®ºó¸üÐÂlocal bridge server£¬ gateway

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4. ·Ö²¼Ê½¹ÜÀíClient + Server

GeodeµÄ·Ö²¼Ê½ÏûϢͨÐÅ·ÖΪÖ÷ÒªÁ½´óÀ࣬һÀàÊÇPeer to Peer£¬Ö÷ҪʹÓÃÁËInternalDistributedMember¡£

4.1 Peer to Peer ÏûÏ¢»úÖÆ

InternalDistributedMember·â×°ÁË·Ö²¼Ê½memberµÄÐÅÏ¢£¬µ±ÐèÒª·¢ËÍp2pÏûϢʱ£¬ÐèÒªÓøöÔÏó±íÃ÷Ä¿±ê¡£

DMÌṩÁË»ñÈ¡ËùÓе±Ç°clusterÖеÄpeersÁÐ±í£¬²¢Í¨¹ýlisternersÀ´»ñÈ¡¶¯Ì¬ÐÅÏ¢£¬¶øÆäµ×²ãÔòÊÇͨ¹ýDistributionAdvisorʵÏÖ£¬Í³Ò»µÄģʽ£¬ËùÒÔÕæÕý³ïı»­²áµÄ¶¼ÊÇÄ»ÁÅ¡£DMÖ÷Òª·â×°ÁËÏà¹ØµÄÍøÂçͨÐÅÐÅÏ¢£¬°üº¬netMember, dcPort£¨direct channel port£©, vmPid£¨member machine¡¯s process id£©µÈ£¬µ±È»ÊµÏÖÌØ¶¨ÄÚ²¿ÐòÁл¯½Ó¿Ú£¨DataSerializableFixedID£©ÊDZز»¿ÉÉٵġ£

¶øÏûÏ¢ÔòÊÇDistributionMessage·â×°£¬°üº¬ÁËÉÏÊöInternalDistributedMemberÐÅÏ¢µÄsenderÓëdestination,ÒÔ¼°¶à¸örecipientsµÄInternalDistrbutedMember[]Êý×飬»¹ÓÐÍò¶ñµÄÓÃÓÚdirect ackµÄReplySenderµÈ¡£

Õû¸öÏûϢͨÐŹý³Ì´ó¸ÅÊÇÏÈ´´½¨DistributionMessage, É趨recipient£¨¿ÉÒÔ¶à¸ö£©,Ö®ºóµ÷ÓÃ(DistrbutManager DM) DM.putOutgoing(message)¡£

Èç¹ûÐèÒª²»µ«·¢ËÍÏûÏ¢£¬¶øÇÒ»¹ÒªÈ·ÈÏÏûÏ¢»Ø¸´response£¬ÔòҪʹÓÃÖøÃûµÄReplyProcessor21, Èç¹ûÄã¿´µ½¹ýGemfire/GeodeµÄThreadDump, Äã¾ÍÃ÷°×ÎÒ˵ʲôÁË¡£

»¹ÊÇÀ´¸öÐòÁÐͼ°É£¬Ò»Í¼µÖǧÑÔ¡£

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4.2 Client / Server ͨÐÅ

Client/ServerͨÐÅ»úÖÆÓëp2pÂÔÓв»Í¬¡£Server¶Ë·â×°ÁËcommand£¬ÒýÈëÖÇÄÒÍÅBridgeServerImpl, AcceptorImpl, Client¶ËÔò·â×°ÁËAbstractOp¡£

Server:

AcceptorimplÖ÷Òª¼àÌýsocket¶Ë¿Ú£¬½ÓÊܿͻ§¶ËµÄÁ´½Ó¡£¶øÆäÖÐÓÖͨ¹ýÇø·Ömax-connections, max-threads¶ø·ÖΪʹÓÃdedicated thread»¹ÊÇselectorģʽµÄNIO´¦Àí¡£

Client:

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ÖµµÃ×¢ÒâµÄÊÇ£¬¿Í»§¶Ë¿ÉÒÔͨ¹ýsubscribe eventsÓÚÌØ¶¨£¯¶à¸öregion»òÕßͨ¹ýÄÚÖõÄcontinuous queries£¬ÕâÑùµ±·þÎñÆ÷¶ËÓÐÊý¾Ý¸üÐÂÔòclient¶Ë¿ÉÒÔÊܵ½¸üеÄ֪ͨevent¡£

5. ×ܽá

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