涓€鏂囧交搴曟悶鎳?zookeeper 鏍稿績鐭ヨ瘑鐐?

Posted 2021-03-31 绋嬪簭鍛橀潰璇曞惂

鐐瑰嚮鈥?/span>绋嬪簭鍛橀潰璇曞惂鈥濓紝閫夋嫨鈥滄槦鏍囸煍濃€?/span>

鍥炲鍏抽敭璇嶁€滈潰璇曗€濇湁鎯婂枩~

1. ZooKeeper 鏄粈涔堬紵

ZooKeeper 鏄竴涓紑婧愮殑鍒嗗竷寮忓崗璋冩湇鍔°€傚畠鏄竴涓负鍒嗗竷寮忓簲鐢ㄦ彁渚涗竴鑷存€ф湇鍔＄殑杞欢锛屽垎甯冨紡搴旂敤绋嬪簭鍙互鍩轰簬 Zookeeper 瀹炵幇璇稿鏁版嵁鍙戝竷/璁㈤槄銆佽礋杞藉潎琛°€佸懡鍚嶆湇鍔°€佸垎甯冨紡鍗忚皟/閫氱煡銆侀泦缇ょ鐞嗐€丮aster 閫変妇銆佸垎甯冨紡閿佸拰鍒嗗竷寮忛槦鍒楃瓑鍔熻兘銆?/span>

ZooKeeper 鐨勭洰鏍囧氨鏄皝瑁呭ソ澶嶆潅鏄撳嚭閿欑殑鍏抽敭鏈嶅姟锛屽皢绠€鍗曟槗鐢ㄧ殑鎺ュ彛鍜屾€ц兘楂樻晥銆佸姛鑳界ǔ瀹氱殑绯荤粺鎻愪緵缁欑敤鎴枫€?/span>

Zookeeper 淇濊瘉浜嗗涓嬪垎甯冨紡涓€鑷存€х壒鎬э細

锛?锛夐『搴忎竴鑷存€?/span>

锛?锛夊師瀛愭€?/span>

锛?锛夊崟涓€瑙嗗浘

锛?锛夊彲闈犳€?/span>

锛?锛夊疄鏃舵€э紙鏈€缁堜竴鑷存€э級

瀹㈡埛绔殑璇昏姹傚彲浠ヨ闆嗙兢涓殑浠绘剰涓€鍙版満鍣ㄥ鐞嗭紝濡傛灉璇昏姹傚湪鑺傜偣涓婃敞鍐屼簡鐩戝惉鍣紝杩欎釜鐩戝惉鍣ㄤ篃鏄敱鎵€杩炴帴鐨?zookeeper 鏈哄櫒鏉ュ鐞嗐€傚浜庡啓璇锋眰锛岃繖浜涜姹備細鍚屾椂鍙戠粰鍏朵粬 zookeeper 鏈哄櫒骞朵笖杈炬垚涓€鑷村悗锛岃姹傛墠浼氳繑鍥炴垚鍔熴€傚洜姝わ紝闅忕潃 zookeeper 鐨勯泦缇ゆ満鍣ㄥ澶氾紝璇昏姹傜殑鍚炲悙浼氭彁楂樹絾鏄啓璇锋眰鐨勫悶鍚愪細涓嬮檷銆?/span>

鏈夊簭鎬ф槸 zookeeper 涓潪甯搁噸瑕佺殑涓€涓壒鎬э紝鎵€鏈夌殑鏇存柊閮芥槸鍏ㄥ眬鏈夊簭鐨勶紝姣忎釜鏇存柊閮芥湁涓€涓敮涓€鐨勬椂闂存埑锛岃繖涓椂闂存埑绉颁负 zxid锛圸ookeeper Transaction Id锛夈€傝€岃璇锋眰鍙細鐩稿浜庢洿鏂版湁搴忥紝涔熷氨鏄璇锋眰鐨勮繑鍥炵粨鏋滀腑浼氬甫鏈夎繖涓獄ookeeper 鏈€鏂扮殑 zxid銆?/span>

2. ZooKeeper 鎻愪緵浜嗕粈涔堬紵

鏂囦欢绯荤粺

閫氱煡鏈哄埗

3. Zookeeper 鏂囦欢绯荤粺

Zookeeper 鎻愪緵涓€涓灞傜骇鐨勮妭鐐瑰懡鍚嶇┖闂达紙鑺傜偣绉颁负 znode锛夈€備笌鏂囦欢绯荤粺涓嶅悓鐨勬槸锛岃繖浜涜妭鐐归兘鍙互璁剧疆鍏宠仈鐨勬暟鎹紝鑰屾枃浠剁郴缁熶腑鍙湁鏂囦欢鑺傜偣鍙互瀛樻斁鏁版嵁鑰岀洰褰曡妭鐐逛笉琛屻€?/span>

Zookeeper 涓轰簡淇濊瘉楂樺悶鍚愬拰浣庡欢杩燂紝鍦ㄥ唴瀛樹腑缁存姢浜嗚繖涓爲鐘剁殑鐩綍缁撴瀯锛岃繖绉嶇壒鎬т娇寰?Zookeeper 涓嶈兘鐢ㄤ簬瀛樻斁澶ч噺鐨勬暟鎹紝姣忎釜鑺傜偣鐨勫瓨鏀炬暟鎹笂闄愪负1M銆?/span>

4. Zookeeper 鎬庝箞淇濊瘉涓讳粠鑺傜偣鐨勭姸鎬佸悓姝ワ紵

Zookeeper 鐨勬牳蹇冩槸鍘熷瓙骞挎挱鏈哄埗锛岃繖涓満鍒朵繚璇佷簡鍚勪釜 server 涔嬮棿鐨勫悓姝ャ€傚疄鐜拌繖涓満鍒剁殑鍗忚鍙仛 Zab 鍗忚銆俍ab 鍗忚鏈変袱绉嶆ā寮忥紝瀹冧滑鍒嗗埆鏄仮澶嶆ā寮忓拰骞挎挱妯″紡銆?/span>

鎭㈠妯″紡
褰撴湇鍔″惎鍔ㄦ垨鑰呭湪棰嗗鑰呭穿婧冨悗锛孼ab灏辫繘鍏ヤ簡鎭㈠妯″紡锛屽綋棰嗗鑰呰閫変妇鍑烘潵锛屼笖澶у鏁?server 瀹屾垚浜嗗拰 leader 鐨勭姸鎬佸悓姝ヤ互鍚庯紝鎭㈠妯″紡灏辩粨鏉熶簡銆傜姸鎬佸悓姝ヤ繚璇佷簡 leader 鍜?server 鍏锋湁鐩稿悓鐨勭郴缁熺姸鎬併€?/span>

骞挎挱妯″紡
涓€鏃?leader 宸茬粡鍜屽鏁扮殑 follower 杩涜浜嗙姸鎬佸悓姝ュ悗锛屽畠灏卞彲浠ュ紑濮嬪箍鎾秷鎭簡锛屽嵆杩涘叆骞挎挱鐘舵€併€傝繖鏃跺€欏綋涓€涓?server 鍔犲叆 ZooKeeper 鏈嶅姟涓紝瀹冧細鍦ㄦ仮澶嶆ā寮忎笅鍚姩锛屽彂鐜?leader锛屽苟鍜?leader 杩涜鐘舵€佸悓姝ャ€傚緟鍒板悓姝ョ粨鏉燂紝瀹冧篃鍙備笌娑堟伅骞挎挱銆俍ooKeeper 鏈嶅姟涓€鐩寸淮鎸佸湪 Broadcast 鐘舵€侊紝鐩村埌 leader 宕╂簝浜嗘垨鑰?leader 澶卞幓浜嗗ぇ閮ㄥ垎鐨?followers 鏀寔銆?/span>

5. 鍥涚绫诲瀷鐨勬暟鎹妭鐐?Znode

锛?锛塒ERSISTENT-鎸佷箙鑺傜偣

闄ら潪鎵嬪姩鍒犻櫎锛屽惁鍒欒妭鐐逛竴鐩村瓨鍦ㄤ簬 Zookeeper 涓?/span>

锛?锛塃PHEMERAL-涓存椂鑺傜偣

涓存椂鑺傜偣鐨勭敓鍛藉懆鏈熶笌瀹㈡埛绔細璇濈粦瀹氾紝涓€鏃﹀鎴风浼氳瘽澶辨晥锛堝鎴风涓巣ookeeper 杩炴帴鏂紑涓嶄竴瀹氫細璇濆け鏁堬級锛岄偅涔堣繖涓鎴风鍒涘缓鐨勬墍鏈変复鏃惰妭鐐归兘浼氳绉婚櫎銆?/span>

锛?锛塒ERSISTENT_SEQUENTIAL-鎸佷箙椤哄簭鑺傜偣

鍩烘湰鐗规€у悓鎸佷箙鑺傜偣锛屽彧鏄鍔犱簡椤哄簭灞炴€э紝鑺傜偣鍚嶅悗杈逛細杩藉姞涓€涓敱鐖惰妭鐐圭淮鎶ょ殑鑷鏁村瀷鏁板瓧銆?/span>

锛?锛塃PHEMERAL_SEQUENTIAL-涓存椂椤哄簭鑺傜偣

鍩烘湰鐗规€у悓涓存椂鑺傜偣锛屽鍔犱簡椤哄簭灞炴€э紝鑺傜偣鍚嶅悗杈逛細杩藉姞涓€涓敱鐖惰妭鐐圭淮鎶ょ殑鑷鏁村瀷鏁板瓧銆?/span>

6. Zookeeper Watcher 鏈哄埗 鈥?鏁版嵁鍙樻洿閫氱煡

Zookeeper 鍏佽瀹㈡埛绔悜鏈嶅姟绔殑鏌愪釜 Znode 娉ㄥ唽涓€涓?Watcher 鐩戝惉锛屽綋鏈嶅姟绔殑涓€浜涙寚瀹氫簨浠惰Е鍙戜簡杩欎釜 Watcher锛屾湇鍔＄浼氬悜鎸囧畾瀹㈡埛绔彂閫佷竴涓簨浠堕€氱煡鏉ュ疄鐜板垎甯冨紡鐨勯€氱煡鍔熻兘锛岀劧鍚庡鎴风鏍规嵁 Watcher 閫氱煡鐘舵€佸拰浜嬩欢绫诲瀷鍋氬嚭涓氬姟涓婄殑鏀瑰彉銆?/span>

宸ヤ綔鏈哄埗锛?/span>

锛?锛夊鎴风娉ㄥ唽 watcher

锛?锛夋湇鍔＄澶勭悊 watcher

锛?锛夊鎴风鍥炶皟 watcher

Watcher 鐗规€ф€荤粨锛?/span>

锛?锛変竴娆℃€?/span>

鏃犺鏄湇鍔＄杩樻槸瀹㈡埛绔紝涓€鏃︿竴涓?Watcher 琚?瑙?鍙?锛孼ookeeper 閮戒細灏嗗叾浠庣浉搴旂殑瀛樺偍涓Щ闄ゃ€傝繖鏍风殑璁捐鏈夋晥鐨勫噺杞讳簡鏈嶅姟绔殑鍘嬪姏锛屼笉鐒跺浜庢洿鏂伴潪甯搁绻佺殑鑺傜偣锛屾湇鍔＄浼氫笉鏂殑鍚戝鎴风鍙戦€佷簨浠堕€氱煡锛屾棤璁哄浜庣綉缁滆繕鏄湇鍔＄鐨勫帇鍔涢兘闈炲父澶с€?/span>

锛?锛夊鎴风涓茶鎵ц

瀹㈡埛绔?Watcher 鍥炶皟鐨勮繃绋嬫槸涓€涓覆琛屽悓姝ョ殑杩囩▼銆?/span>

锛?锛夎交閲?/span>

3.1銆乄atcher 閫氱煡闈炲父绠€鍗曪紝鍙細鍛婅瘔瀹㈡埛绔彂鐢熶簡浜嬩欢锛岃€屼笉浼氳鏄庝簨浠剁殑鍏蜂綋鍐呭銆?/span>

3.2銆佸鎴风鍚戞湇鍔＄娉ㄥ唽 Watcher 鐨勬椂鍊欙紝骞朵笉浼氭妸瀹㈡埛绔湡瀹炵殑 Watcher 瀵硅薄瀹炰綋浼犻€掑埌鏈嶅姟绔紝浠呬粎鏄湪瀹㈡埛绔姹備腑浣跨敤 boolean 绫诲瀷灞炴€ц繘琛屼簡鏍囪銆?/span>

锛?锛墂atcher event 寮傛鍙戦€?watcher 鐨勯€氱煡浜嬩欢浠?server 鍙戦€佸埌 client 鏄紓姝ョ殑锛岃繖灏卞瓨鍦ㄤ竴涓棶棰橈紝涓嶅悓鐨勫鎴风鍜屾湇鍔″櫒涔嬮棿閫氳繃 socket 杩涜閫氫俊锛岀敱浜庣綉缁滃欢杩熸垨鍏朵粬鍥犵礌瀵艰嚧瀹㈡埛绔湪涓嶉€氱殑鏃跺埢鐩戝惉鍒颁簨浠讹紝鐢变簬 Zookeeper 鏈韩鎻愪緵浜?ordering guarantee锛屽嵆瀹㈡埛绔洃鍚簨浠跺悗锛屾墠浼氭劅鐭ュ畠鎵€鐩戣 znode鍙戠敓浜嗗彉鍖栥€傛墍浠ユ垜浠娇鐢?Zookeeper 涓嶈兘鏈熸湜鑳藉鐩戞帶鍒拌妭鐐规瘡娆＄殑鍙樺寲銆俍ookeeper 鍙兘淇濊瘉鏈€缁堢殑涓€鑷存€э紝鑰屾棤娉曚繚璇佸己涓€鑷存€с€?/span>

锛?锛夋敞鍐?watcher getData銆乪xists銆乬etChildren

锛?锛夎Е鍙?watcher create銆乨elete銆乻etData

锛?锛夊綋涓€涓鎴风杩炴帴鍒颁竴涓柊鐨勬湇鍔″櫒涓婃椂锛寃atch 灏嗕細琚互浠绘剰浼氳瘽浜嬩欢瑙﹀彂銆傚綋涓庝竴涓湇鍔″櫒澶卞幓杩炴帴鐨勬椂鍊欙紝鏄棤娉曟帴鏀跺埌 watch 鐨勩€傝€屽綋 client 閲嶆柊杩炴帴鏃讹紝濡傛灉闇€瑕佺殑璇濓紝鎵€鏈夊厛鍓嶆敞鍐岃繃鐨?watch锛岄兘浼氳閲嶆柊娉ㄥ唽銆傞€氬父杩欐槸瀹屽叏閫忔槑鐨勩€傚彧鏈夊湪涓€涓壒娈婃儏鍐典笅锛寃atch 鍙兘浼氫涪澶憋細瀵逛簬涓€涓湭鍒涘缓鐨?znode鐨?exist watch锛屽鏋滃湪瀹㈡埛绔柇寮€杩炴帴鏈熼棿琚垱寤轰簡锛屽苟涓旈殢鍚庡湪瀹㈡埛绔繛鎺ヤ笂涔嬪墠鍙堝垹闄や簡锛岃繖绉嶆儏鍐典笅锛岃繖涓?watch 浜嬩欢鍙兘浼氳涓㈠け銆?/span>

7. 瀹㈡埛绔敞鍐?Watcher 瀹炵幇

锛?锛夎皟鐢?getData()/getChildren()/exist()涓変釜 API锛屼紶鍏?Watcher 瀵硅薄

锛?锛夋爣璁拌姹?request锛屽皝瑁?Watcher 鍒?WatchRegistration

锛?锛夊皝瑁呮垚 Packet 瀵硅薄锛屽彂鏈嶅姟绔彂閫?request

锛?锛夋敹鍒版湇鍔＄鍝嶅簲鍚庯紝灏?Watcher 娉ㄥ唽鍒?ZKWatcherManager 涓繘琛岀鐞?/span>

锛?锛夎姹傝繑鍥烇紝瀹屾垚娉ㄥ唽銆?/span>

8. 鏈嶅姟绔鐞?Watcher 瀹炵幇

锛?锛夋湇鍔＄鎺ユ敹 Watcher 骞跺瓨鍌?/span>

鎺ユ敹鍒板鎴风璇锋眰锛屽鐞嗚姹傚垽鏂槸鍚﹂渶瑕佹敞鍐?Watcher锛岄渶瑕佺殑璇濆皢鏁版嵁鑺傜偣鐨勮妭鐐硅矾寰勫拰 ServerCnxn锛圫erverCnxn 浠ｈ〃涓€涓鎴风鍜屾湇鍔＄鐨勮繛鎺ワ紝瀹炵幇浜?Watcher 鐨?process 鎺ュ彛锛屾鏃跺彲浠ョ湅鎴愪竴涓?Watcher 瀵硅薄锛夊瓨鍌ㄥ湪WatcherManager 鐨?WatchTable 鍜?watch2Paths 涓幓銆?/span>

锛?锛塛atcher 瑙﹀彂

浠ユ湇鍔＄鎺ユ敹鍒?setData() 浜嬪姟璇锋眰瑙﹀彂 NodeDataChanged 浜嬩欢涓轰緥锛?/span>

2.1 灏佽 WatchedEvent

灏嗛€氱煡鐘舵€侊紙SyncConnected锛夈€佷簨浠剁被鍨嬶紙NodeDataChanged锛変互鍙婅妭鐐硅矾寰勫皝瑁呮垚涓€涓?WatchedEvent 瀵硅薄

2.2 鏌ヨ Watcher

浠?WatchTable 涓牴鎹妭鐐硅矾寰勬煡鎵?Watcher

2.3 娌℃壘鍒帮紱璇存槑娌℃湁瀹㈡埛绔湪璇ユ暟鎹妭鐐逛笂娉ㄥ唽杩?Watcher

2.4 鎵惧埌锛涙彁鍙栧苟浠?WatchTable 鍜?Watch2Paths 涓垹闄ゅ搴?Watcher锛堜粠杩欓噷鍙互鐪嬪嚭 Watcher 鍦ㄦ湇鍔＄鏄竴娆℃€х殑锛岃Е鍙戜竴娆″氨澶辨晥浜嗭級

锛?锛夎皟鐢?process 鏂规硶鏉ヨЕ鍙?Watcher

杩欓噷 process 涓昏灏辨槸閫氳繃 ServerCnxn 瀵瑰簲鐨?TCP 杩炴帴鍙戦€?Watcher 浜嬩欢閫氱煡銆?/span>

9. 瀹㈡埛绔洖璋?Watcher

瀹㈡埛绔?SendThread 绾跨▼鎺ユ敹浜嬩欢閫氱煡锛屼氦鐢?EventThread 绾跨▼鍥炶皟 Watcher銆?/span>

瀹㈡埛绔殑 Watcher 鏈哄埗鍚屾牱鏄竴娆℃€х殑锛屼竴鏃﹁瑙﹀彂鍚庯紝璇?Watcher 灏卞け鏁堜簡銆?/span>

10. ACL 鏉冮檺鎺у埗鏈哄埗

UGO锛圲ser/Group/Others锛?/span>

鐩墠鍦?Linux/Unix 鏂囦欢绯荤粺涓娇鐢紝涔熸槸浣跨敤鏈€骞挎硾鐨勬潈闄愭帶鍒舵柟寮忋€傛槸涓€绉嶇矖绮掑害鐨勬枃浠剁郴缁熸潈闄愭帶鍒舵ā寮忋€?/span>

ACL锛圓ccess Control List锛夎闂帶鍒跺垪琛?/span>

鍖呮嫭涓変釜鏂归潰锛?/span>

鏉冮檺妯″紡锛圫cheme锛?/span>

锛?锛塂igest锛氭渶甯哥敤锛岀敤绫讳技浜?username:password 鐨勬潈闄愭爣璇嗘潵杩涜鏉冮檺閰嶇疆锛屼究浜庡尯鍒嗕笉鍚屽簲鐢ㄦ潵杩涜鏉冮檺鎺у埗

锛?锛塛orld锛氭渶寮€鏀剧殑鏉冮檺鎺у埗鏂瑰紡锛屾槸涓€绉嶇壒娈婄殑 digest 妯″紡锛屽彧鏈変竴涓潈闄愭爣璇嗏€渨orld:anyone鈥?/span>

锛?锛塖uper锛氳秴绾х敤鎴?/span>

鎺堟潈瀵硅薄

鏉冮檺 Permission

锛?锛塁REATE锛氭暟鎹妭鐐瑰垱寤烘潈闄愶紝鍏佽鎺堟潈瀵硅薄鍦ㄨ Znode 涓嬪垱寤哄瓙鑺傜偣

锛?锛塂ELETE锛氬瓙鑺傜偣鍒犻櫎鏉冮檺锛屽厑璁告巿鏉冨璞″垹闄よ鏁版嵁鑺傜偣鐨勫瓙鑺傜偣

锛?锛塕EAD锛氭暟鎹妭鐐圭殑璇诲彇鏉冮檺锛屽厑璁告巿鏉冨璞¤闂鏁版嵁鑺傜偣骞惰鍙栧叾鏁版嵁鍐呭鎴栧瓙鑺傜偣鍒楄〃绛?/span>

锛?锛塛RITE锛氭暟鎹妭鐐规洿鏂版潈闄愶紝鍏佽鎺堟潈瀵硅薄瀵硅鏁版嵁鑺傜偣杩涜鏇存柊鎿嶄綔

锛?锛堿DMIN锛氭暟鎹妭鐐圭鐞嗘潈闄愶紝鍏佽鎺堟潈瀵硅薄瀵硅鏁版嵁鑺傜偣杩涜 ACL 鐩稿叧璁剧疆鎿嶄綔

11. Chroot 鐗规€?/p>

3.2.0 鐗堟湰鍚庯紝娣诲姞浜?Chroot 鐗规€э紝璇ョ壒鎬у厑璁告瘡涓鎴风涓鸿嚜宸辫缃竴涓懡鍚嶇┖闂淬€傚鏋滀竴涓鎴风璁剧疆浜?Chroot锛岄偅涔堣瀹㈡埛绔鏈嶅姟鍣ㄧ殑浠讳綍鎿嶄綔锛岄兘灏嗕細琚檺鍒跺湪鍏惰嚜宸辩殑鍛藉悕绌洪棿涓嬨€?/span>

閫氳繃璁剧疆 Chroot锛岃兘澶熷皢涓€涓鎴风搴旂敤浜?Zookeeper 鏈嶅姟绔殑涓€棰楀瓙鏍戠浉瀵瑰簲锛屽湪閭ｄ簺澶氫釜搴旂敤鍏敤涓€涓?Zookeeper 杩涚兢鐨勫満鏅笅锛屽瀹炵幇涓嶅悓搴旂敤闂寸殑鐩镐簰闅旂闈炲父鏈夊府鍔┿€?/span>

12. 浼氳瘽绠＄悊

鍒嗘《绛栫暐锛氬皢绫讳技鐨勪細璇濇斁鍦ㄥ悓涓€鍖哄潡涓繘琛岀鐞嗭紝浠ヤ究浜?Zookeeper 瀵逛細璇濊繘琛屼笉鍚屽尯鍧楃殑闅旂澶勭悊浠ュ強鍚屼竴鍖哄潡鐨勭粺涓€澶勭悊銆?/span>

鍒嗛厤鍘熷垯锛氭瘡涓細璇濈殑鈥滀笅娆¤秴鏃舵椂闂寸偣鈥濓紙ExpirationTime锛?/span>

璁＄畻鍏紡锛?/span>

ExpirationTime_ = currentTime + sessionTimeout

ExpirationTime = (ExpirationTime_ / ExpirationInrerval + 1) *

ExpirationInterval , ExpirationInterval 鏄寚 Zookeeper 浼氳瘽瓒呮椂妫€鏌ユ椂闂撮棿闅旓紝榛樿 tickTime

13. 鏈嶅姟鍣ㄨ鑹?/p>

Leader

锛?锛変簨鍔¤姹傜殑鍞竴璋冨害鍜屽鐞嗚€咃紝淇濊瘉闆嗙兢浜嬪姟澶勭悊鐨勯『搴忔€?/span>

锛?锛夐泦缇ゅ唴閮ㄥ悇鏈嶅姟鐨勮皟搴﹁€?/span>

Follower

锛?锛夊鐞嗗鎴风鐨勯潪浜嬪姟璇锋眰锛岃浆鍙戜簨鍔¤姹傜粰 Leader 鏈嶅姟鍣?/span>

锛?锛夊弬涓庝簨鍔¤姹?Proposal 鐨勬姇绁?/span>

锛?锛夊弬涓?Leader 閫変妇鎶曠エ

Observer

锛?锛?.0 鐗堟湰浠ュ悗寮曞叆鐨勪竴涓湇鍔″櫒瑙掕壊锛屽湪涓嶅奖鍝嶉泦缇や簨鍔″鐞嗚兘鍔涚殑鍩虹涓婃彁鍗囬泦缇ょ殑闈炰簨鍔″鐞嗚兘鍔?/span>

锛?锛夊鐞嗗鎴风鐨勯潪浜嬪姟璇锋眰锛岃浆鍙戜簨鍔¤姹傜粰 Leader 鏈嶅姟鍣?/span>

锛?锛変笉鍙備笌浠讳綍褰㈠紡鐨勬姇绁?/span>

14. Zookeeper 涓?Server 宸ヤ綔鐘舵€?/p>

鏈嶅姟鍣ㄥ叿鏈夊洓绉嶇姸鎬侊紝鍒嗗埆鏄?LOOKING銆丗OLLOWING銆丩EADING銆丱BSERVING銆?/span>

锛?锛塋OOKING锛氬 鎵?Leader 鐘舵€併€傚綋鏈嶅姟鍣ㄥ浜庤鐘舵€佹椂锛屽畠浼氳涓哄綋鍓嶉泦缇や腑娌℃湁 Leader锛屽洜姝ら渶瑕佽繘鍏?Leader 閫変妇鐘舵€併€?/span>

锛?锛塅OLLOWING锛氳窡闅忚€呯姸鎬併€傝〃鏄庡綋鍓嶆湇鍔″櫒瑙掕壊鏄?Follower銆?/span>

锛?锛塋EADING锛氶瀵艰€呯姸鎬併€傝〃鏄庡綋鍓嶆湇鍔″櫒瑙掕壊鏄?Leader銆?/span>

锛?锛塐BSERVING锛氳瀵熻€呯姸鎬併€傝〃鏄庡綋鍓嶆湇鍔″櫒瑙掕壊鏄?Observer銆?/span>

15. 鏁版嵁鍚屾

鏁翠釜闆嗙兢瀹屾垚 Leader 閫変妇涔嬪悗锛孡earner锛團ollower 鍜?Observer 鐨勭粺绉帮級鍥炲悜Leader 鏈嶅姟鍣ㄨ繘琛屾敞鍐屻€傚綋 Learner 鏈嶅姟鍣ㄦ兂 Leader 鏈嶅姟鍣ㄥ畬鎴愭敞鍐屽悗锛岃繘鍏ユ暟鎹悓姝ョ幆鑺傘€?/span>

鏁版嵁鍚屾娴佺▼锛氾紙鍧囦互娑堟伅浼犻€掔殑鏂瑰紡杩涜锛?/span>

Learner 鍚?Learder 娉ㄥ唽

鏁版嵁鍚屾

鍚屾纭

Zookeeper 鐨勬暟鎹悓姝ラ€氬父鍒嗕负鍥涚被锛?/span>

锛?锛夌洿鎺ュ樊寮傚寲鍚屾锛圖IFF 鍚屾锛?/span>

锛?锛夊厛鍥炴粴鍐嶅樊寮傚寲鍚屾锛圱RUNC+DIFF 鍚屾锛?/span>

锛?锛変粎鍥炴粴鍚屾锛圱RUNC 鍚屾锛?/span>

锛?锛夊叏閲忓悓姝ワ紙SNAP 鍚屾锛?/span>

鍦ㄨ繘琛屾暟鎹悓姝ュ墠锛孡eader 鏈嶅姟鍣ㄤ細瀹屾垚鏁版嵁鍚屾鍒濆鍖栵細

peerLastZxid锛?/span>

路 浠?learner 鏈嶅姟鍣ㄦ敞鍐屾椂鍙戦€佺殑 ACKEPOCH 娑堟伅涓彁鍙?lastZxid锛堣Learner 鏈嶅姟鍣ㄦ渶鍚庡鐞嗙殑 ZXID锛?/span>

minCommittedLog锛?/span>

路 Leader 鏈嶅姟鍣?Proposal 缂撳瓨闃熷垪 committedLog 涓渶灏?ZXIDmaxCommittedLog锛?/span>

路 Leader 鏈嶅姟鍣?Proposal 缂撳瓨闃熷垪 committedLog 涓渶澶?ZXID鐩存帴宸紓鍖栧悓姝ワ紙DIFF 鍚屾锛?/span>

路 鍦烘櫙锛歱eerLastZxid 浠嬩簬 minCommittedLog 鍜?maxCommittedLog涔嬮棿鍏堝洖婊氬啀宸紓鍖栧悓姝ワ紙TRUNC+DIFF 鍚屾锛?/span>

路 鍦烘櫙锛氬綋鏂扮殑 Leader 鏈嶅姟鍣ㄥ彂鐜版煇涓?Learner 鏈嶅姟鍣ㄥ寘鍚簡涓€鏉¤嚜宸辨病鏈夌殑浜嬪姟璁板綍锛岄偅涔堝氨闇€瑕佽璇?Learner 鏈嶅姟鍣ㄨ繘琛屼簨鍔″洖婊氣€撳洖婊氬埌 Leader鏈嶅姟鍣ㄤ笂瀛樺湪鐨勶紝鍚屾椂涔熸槸鏈€鎺ヨ繎浜?peerLastZxid 鐨?ZXID浠呭洖婊氬悓姝ワ紙TRUNC 鍚屾锛?/span>

路 鍦烘櫙锛歱eerLastZxid 澶т簬 maxCommittedLog

鍏ㄩ噺鍚屾锛圫NAP 鍚屾锛?/span>

路 鍦烘櫙涓€锛歱eerLastZxid 灏忎簬 minCommittedLog

路 鍦烘櫙浜?/span>锛歀eader 鏈嶅姟鍣ㄤ笂娌℃湁 Proposal 缂撳瓨闃熷垪涓?peerLastZxid 涓嶇瓑浜?lastProcessZxid

16. zookeeper 鏄浣曚繚璇佷簨鍔＄殑椤哄簭涓€鑷存€х殑锛?/p>

zookeeper 閲囩敤浜嗗叏灞€閫掑鐨勪簨鍔?Id 鏉ユ爣璇嗭紝鎵€鏈夌殑 proposal锛堟彁璁級閮藉湪琚彁鍑虹殑鏃跺€欏姞涓婁簡 zxid锛寊xid 瀹為檯涓婃槸涓€涓?64 浣嶇殑鏁板瓧锛岄珮 32 浣嶆槸 epoch锛?鏃舵湡; 绾厓; 涓? 鏂版椂浠ｏ級鐢ㄦ潵鏍囪瘑 leader 鍛ㄦ湡锛屽鏋滄湁鏂扮殑 leader 浜х敓鍑烘潵锛宔poch浼氳嚜澧烇紝浣?32 浣嶇敤鏉ラ€掑璁℃暟銆傚綋鏂颁骇鐢?proposal 鐨勬椂鍊欙紝浼氫緷鎹暟鎹簱鐨勪袱闃舵杩囩▼锛岄鍏堜細鍚戝叾浠栫殑 server 鍙戝嚭浜嬪姟鎵ц璇锋眰锛屽鏋滆秴杩囧崐鏁扮殑鏈哄櫒閮借兘鎵ц骞朵笖鑳藉鎴愬姛锛岄偅涔堝氨浼氬紑濮嬫墽琛屻€?/span>

17. 鍒嗗竷寮忛泦缇や腑涓轰粈涔堜細鏈?Master涓昏妭鐐癸紵

鍦ㄥ垎甯冨紡鐜涓紝鏈変簺涓氬姟閫昏緫鍙渶瑕侀泦缇や腑鐨勬煇涓€鍙版満鍣ㄨ繘琛屾墽琛岋紝鍏朵粬鐨勬満鍣ㄥ彲浠ュ叡浜繖涓粨鏋滐紝杩欐牱鍙互澶уぇ鍑忓皯閲嶅璁＄畻锛屾彁楂樻€ц兘锛屼簬鏄氨闇€瑕佽繘琛?leader 閫変妇銆?/span>

18. zk 鑺傜偣瀹曟満濡備綍澶勭悊锛?/p>

Zookeeper 鏈韩涔熸槸闆嗙兢锛屾帹鑽愰厤缃笉灏戜簬 3 涓湇鍔″櫒銆俍ookeeper 鑷韩涔熻淇濊瘉褰撲竴涓妭鐐瑰畷鏈烘椂锛屽叾浠栬妭鐐逛細缁х画鎻愪緵鏈嶅姟銆?/span>

濡傛灉鏄竴涓?Follower 瀹曟満锛岃繕鏈?2 鍙版湇鍔″櫒鎻愪緵璁块棶锛屽洜涓?Zookeeper 涓婄殑鏁版嵁鏄湁澶氫釜鍓湰鐨勶紝鏁版嵁骞朵笉浼氫涪澶憋紱

濡傛灉鏄竴涓?Leader 瀹曟満锛孼ookeeper 浼氶€変妇鍑烘柊鐨?Leader銆?/span>

ZK 闆嗙兢鐨勬満鍒舵槸鍙瓒呰繃鍗婃暟鐨勮妭鐐规甯革紝闆嗙兢灏辫兘姝ｅ父鎻愪緵鏈嶅姟銆傚彧鏈夊湪 ZK鑺傜偣鎸傚緱澶锛屽彧鍓╀竴鍗婃垨涓嶅埌涓€鍗婅妭鐐硅兘宸ヤ綔锛岄泦缇ゆ墠澶辨晥銆?/span>

鎵€浠?/span>

3 涓妭鐐圭殑 cluster 鍙互鎸傛帀 1 涓妭鐐?leader 鍙互寰楀埌 2 绁?gt;1.5)

2 涓妭鐐圭殑 cluster 灏变笉鑳芥寕鎺変换浣?1 涓妭鐐逛簡(leader 鍙互寰楀埌 1 绁?lt;=1)

19. zookeeper 璐熻浇鍧囪　鍜?nginx 璐熻浇鍧囪　鍖哄埆

zk 鐨勮礋杞藉潎琛℃槸鍙互璋冩帶锛宯ginx 鍙槸鑳借皟鏉冮噸锛屽叾浠栭渶瑕佸彲鎺х殑閮介渶瑕佽嚜宸卞啓鎻掍欢锛涗絾鏄?nginx 鐨勫悶鍚愰噺姣?zk 澶у緢澶氾紝搴旇璇存寜涓氬姟閫夋嫨鐢ㄥ摢绉嶆柟寮忋€?/span>

20. Zookeeper 鏈夊摢鍑犵鍑犵閮ㄧ讲妯″紡锛?/p>

Zookeeper 鏈変笁绉嶉儴缃叉ā寮忥細

鍗曟満閮ㄧ讲锛氫竴鍙伴泦缇や笂杩愯锛?/span>

闆嗙兢閮ㄧ讲锛氬鍙伴泦缇よ繍琛岋紱

浼泦缇ら儴缃诧細涓€鍙伴泦缇ゅ惎鍔ㄥ涓?Zookeeper 瀹炰緥杩愯銆?/span>

21. 闆嗙兢鏈€灏戣鍑犲彴鏈哄櫒锛岄泦缇よ鍒欐槸鎬庢牱鐨勶紵闆嗙兢涓湁 3 鍙版湇鍔″櫒锛屽叾涓竴涓妭鐐瑰畷鏈猴紝杩欎釜鏃跺€?Zookeeper 杩樺彲浠ヤ娇鐢ㄥ悧锛?/p>

闆嗙兢瑙勫垯涓?2N+1 鍙帮紝N>0锛屽嵆 3 鍙般€傚彲浠ョ户缁娇鐢紝鍗曟暟鏈嶅姟鍣ㄥ彧瑕佹病瓒呰繃涓€鍗婄殑鏈嶅姟鍣ㄥ畷鏈哄氨鍙互缁х画浣跨敤銆?/span>

22. 闆嗙兢鏀寔鍔ㄦ€佹坊鍔犳満鍣ㄥ悧锛?/p>

鍏跺疄灏辨槸姘村钩鎵╁浜嗭紝Zookeeper 鍦ㄨ繖鏂归潰涓嶅お濂姐€備袱绉嶆柟寮忥細

鍏ㄩ儴閲嶅惎锛氬叧闂墍鏈?Zookeeper 鏈嶅姟锛屼慨鏀归厤缃箣鍚庡惎鍔ㄣ€備笉褰卞搷涔嬪墠瀹㈡埛绔殑浼氳瘽銆?/span>

閫愪釜閲嶅惎锛氬湪杩囧崐瀛樻椿鍗冲彲鐢ㄧ殑鍘熷垯涓嬶紝涓€鍙版満鍣ㄩ噸鍚笉褰卞搷鏁翠釜闆嗙兢瀵瑰鎻愪緵鏈嶅姟銆傝繖鏄瘮杈冨父鐢ㄧ殑鏂瑰紡銆?/span>

3.5 鐗堟湰寮€濮嬫敮鎸佸姩鎬佹墿瀹广€?/span>

23. Zookeeper 瀵硅妭鐐圭殑 watch 鐩戝惉閫氱煡鏄案涔呯殑鍚楋紵涓轰粈涔堜笉鏄案涔呯殑?

涓嶆槸銆傚畼鏂瑰０鏄庯細涓€涓?Watch 浜嬩欢鏄竴涓竴娆℃€х殑瑙﹀彂鍣紝褰撹璁剧疆浜?Watch鐨勬暟鎹彂鐢熶簡鏀瑰彉鐨勬椂鍊欙紝鍒欐湇鍔″櫒灏嗚繖涓敼鍙樺彂閫佺粰璁剧疆浜?Watch 鐨勫鎴风锛屼互渚块€氱煡瀹冧滑銆?/span>

涓轰粈涔堜笉鏄案涔呯殑锛屼妇涓緥瀛愶紝濡傛灉鏈嶅姟绔彉鍔ㄩ绻侊紝鑰岀洃鍚殑瀹㈡埛绔緢澶氭儏鍐典笅锛屾瘡娆″彉鍔ㄩ兘瑕侀€氱煡鍒版墍鏈夌殑瀹㈡埛绔紝缁欑綉缁滃拰鏈嶅姟鍣ㄩ€犳垚寰堝ぇ鍘嬪姏銆?/span>

涓€鑸槸瀹㈡埛绔墽琛?getData(鈥?鑺傜偣 A鈥?true)锛屽鏋滆妭鐐?A 鍙戠敓浜嗗彉鏇存垨鍒犻櫎锛屽鎴风浼氬緱鍒板畠鐨?watch 浜嬩欢锛屼絾鏄湪涔嬪悗鑺傜偣 A 鍙堝彂鐢熶簡鍙樻洿锛岃€屽鎴风鍙堟病鏈夎缃?watch 浜嬩欢锛屽氨涓嶅啀缁欏鎴风鍙戦€併€?/span>

鍦ㄥ疄闄呭簲鐢ㄤ腑锛屽緢澶氭儏鍐典笅锛屾垜浠殑瀹㈡埛绔笉闇€瑕佺煡閬撴湇鍔＄鐨勬瘡涓€娆″彉鍔紝鎴戝彧瑕佹渶鏂扮殑鏁版嵁鍗冲彲銆?/span>

24. Zookeeper 鐨?java 瀹㈡埛绔兘鏈夊摢浜涳紵

java 瀹㈡埛绔細zk 鑷甫鐨?zkclient 鍙?Apache 寮€婧愮殑 Curator銆?/span>

25. chubby 鏄粈涔堬紝鍜?zookeeper 姣斾綘鎬庝箞鐪嬶紵

chubby 鏄?google 鐨勶紝瀹屽叏瀹炵幇 paxos 绠楁硶锛屼笉寮€婧愩€倆ookeeper 鏄?chubby鐨勫紑婧愬疄鐜帮紝浣跨敤 zab 鍗忚锛宲axos 绠楁硶鐨勫彉绉嶃€?/span>

26. 璇村嚑涓?zookeeper 甯哥敤鐨勫懡浠ゃ€?/p>

甯哥敤鍛戒护锛歭s get set create delete 绛夈€?/span>

27. ZAB 鍜?Paxos 绠楁硶鐨勮仈绯讳笌鍖哄埆锛?/p>

鐩稿悓鐐癸細

锛?锛変袱鑰呴兘瀛樺湪涓€涓被浼间簬 Leader 杩涚▼鐨勮鑹诧紝鐢卞叾璐熻矗鍗忚皟澶氫釜 Follower 杩涚▼鐨勮繍琛?/span>

锛?锛塋eader 杩涚▼閮戒細绛夊緟瓒呰繃鍗婃暟鐨?Follower 鍋氬嚭姝ｇ‘鐨勫弽棣堝悗锛屾墠浼氬皢涓€涓彁妗堣繘琛屾彁浜?/span>

锛?锛塟AB 鍗忚涓紝姣忎釜 Proposal 涓兘鍖呭惈涓€涓?epoch 鍊兼潵浠ｈ〃褰撳墠鐨?Leader鍛ㄦ湡锛孭axos 涓悕瀛椾负 Ballot

涓嶅悓鐐癸細

ZAB 鐢ㄦ潵鏋勫缓楂樺彲鐢ㄧ殑鍒嗗竷寮忔暟鎹富澶囩郴缁燂紙Zookeeper锛夛紝Paxos 鏄敤鏉ユ瀯寤哄垎甯冨紡涓€鑷存€х姸鎬佹満绯荤粺銆?/span>

28. Zookeeper 鐨勫吀鍨嬪簲鐢ㄥ満鏅?/p>

Zookeeper 鏄竴涓吀鍨嬬殑鍙戝竷/璁㈤槄妯″紡鐨勫垎甯冨紡鏁版嵁绠＄悊涓庡崗璋冩鏋讹紝寮€鍙戜汉鍛樺彲浠ヤ娇鐢ㄥ畠鏉ヨ繘琛屽垎甯冨紡鏁版嵁鐨勫彂甯冨拰璁㈤槄銆?/span>

閫氳繃瀵?Zookeeper 涓赴瀵岀殑鏁版嵁鑺傜偣杩涜浜ゅ弶浣跨敤锛岄厤鍚?Watcher 浜嬩欢閫氱煡鏈哄埗锛屽彲浠ラ潪甯告柟渚跨殑鏋勫缓涓€绯诲垪鍒嗗竷寮忓簲鐢ㄤ腑骞撮兘浼氭秹鍙婄殑鏍稿績鍔熻兘锛屽锛?/span>

锛?锛夋暟鎹彂甯?璁㈤槄

锛?锛夎礋杞藉潎琛?/span>

锛?锛夊懡鍚嶆湇鍔?/span>

锛?锛夊垎甯冨紡鍗忚皟/閫氱煡

锛?锛夐泦缇ょ鐞?/span>

锛?锛塎aster 閫変妇

锛?锛夊垎甯冨紡閿?/span>

锛?锛夊垎甯冨紡闃熷垪

鏁版嵁鍙戝竷/璁㈤槄

浠嬬粛

鏁版嵁鍙戝竷/璁㈤槄绯荤粺锛屽嵆鎵€璋撶殑閰嶇疆涓績锛岄【鍚嶆€濅箟灏辨槸鍙戝竷鑰呭彂甯冩暟鎹緵璁㈤槄鑰呰繘琛屾暟鎹闃呫€?/span>

鐩殑

鍔ㄦ€佽幏鍙栨暟鎹紙閰嶇疆淇℃伅锛?/span>

瀹炵幇鏁版嵁锛堥厤缃俊鎭級鐨勯泦涓紡绠＄悊鍜屾暟鎹殑鍔ㄦ€佹洿鏂?/span>

璁捐妯″紡

Push 妯″紡

Pull 妯″紡

鏁版嵁锛堥厤缃俊鎭級鐗规€?/span>

锛?锛夋暟鎹噺閫氬父姣旇緝灏?/span>

锛?锛夋暟鎹唴瀹瑰湪杩愯鏃朵細鍙戠敓鍔ㄦ€佹洿鏂?/span>

锛?锛夐泦缇や腑鍚勬満鍣ㄥ叡浜紝閰嶇疆涓€鑷?/span>

濡傦細鏈哄櫒鍒楄〃淇℃伅銆佽繍琛屾椂寮€鍏抽厤缃€佹暟鎹簱閰嶇疆淇℃伅绛?/span>

鍩轰簬 Zookeeper 鐨勫疄鐜版柟寮?/span>

路 鏁版嵁瀛樺偍锛氬皢鏁版嵁锛堥厤缃俊鎭級瀛樺偍鍒?Zookeeper 涓婄殑涓€涓暟鎹妭鐐?/span>

路 鏁版嵁鑾峰彇锛氬簲鐢ㄥ湪鍚姩鍒濆鍖栬妭鐐逛粠 Zookeeper 鏁版嵁鑺傜偣璇诲彇鏁版嵁锛屽苟鍦ㄨ鑺傜偣涓婃敞鍐屼竴涓暟鎹彉鏇?Watcher

路 鏁版嵁鍙樻洿锛氬綋鍙樻洿鏁版嵁鏃讹紝鏇存柊 Zookeeper 瀵瑰簲鑺傜偣鏁版嵁锛孼ookeeper浼氬皢鏁版嵁鍙樻洿閫氱煡鍙戝埌鍚勫鎴风锛屽鎴风鎺ュ埌閫氱煡鍚庨噸鏂拌鍙栧彉鏇村悗鐨勬暟鎹嵆鍙€?/span>

璐熻浇鍧囪　

zk 鐨勫懡鍚嶆湇鍔?/span>

鍒嗗竷寮忛€氱煡鍜屽崗璋?/span>

瀵逛簬绯荤粺璋冨害鏉ヨ锛氭搷浣滀汉鍛樺彂閫侀€氱煡瀹為檯鏄€氳繃鎺у埗鍙版敼鍙樻煇涓妭鐐圭殑鐘舵€侊紝鐒跺悗 zk 灏嗚繖浜涘彉鍖栧彂閫佺粰娉ㄥ唽浜嗚繖涓妭鐐圭殑 watcher 鐨勬墍鏈夊鎴风銆?/span>

瀵逛簬鎵ц鎯呭喌姹囨姤锛氭瘡涓伐浣滆繘绋嬮兘鍦ㄦ煇涓洰褰曚笅鍒涘缓涓€涓复鏃惰妭鐐广€傚苟鎼哄甫宸ヤ綔鐨勮繘搴︽暟鎹紝杩欐牱姹囨€荤殑杩涚▼鍙互鐩戞帶鐩綍瀛愯妭鐐圭殑鍙樺寲鑾峰緱宸ヤ綔杩涘害鐨勫疄鏃剁殑鍏ㄥ眬鎯呭喌銆?/span>

zk 鐨勫懡鍚嶆湇鍔★紙鏂囦欢绯荤粺锛?/span>

zk 鐨勯厤缃鐞嗭紙鏂囦欢绯荤粺銆侀€氱煡鏈哄埗锛?/span>

绋嬪簭鍒嗗竷寮忕殑閮ㄧ讲鍦ㄤ笉鍚岀殑鏈哄櫒涓婏紝灏嗙▼搴忕殑閰嶇疆淇℃伅鏀惧湪 zk 鐨?znode 涓嬶紝褰撴湁閰嶇疆鍙戠敓鏀瑰彉鏃讹紝涔熷氨鏄?znode 鍙戠敓鍙樺寲鏃讹紝鍙互閫氳繃鏀瑰彉 zk 涓煇涓洰褰曡妭鐐圭殑鍐呭锛屽埄鐢?watcher 閫氱煡缁欏悇涓鎴风锛屼粠鑰屾洿鏀归厤缃€?/span>

Zookeeper 闆嗙兢绠＄悊锛堟枃浠剁郴缁熴€侀€氱煡鏈哄埗锛?/span>

鎵€璋撻泦缇ょ鐞嗘棤鍦ㄤ箮涓ょ偣锛氭槸鍚︽湁鏈哄櫒閫€鍑哄拰鍔犲叆銆侀€変妇 master銆?/span>

瀵逛簬绗竴鐐癸紝鎵€鏈夋満鍣ㄧ害瀹氬湪鐖剁洰褰曚笅鍒涘缓涓存椂鐩綍鑺傜偣锛岀劧鍚庣洃鍚埗鐩綍鑺傜偣

鐨勫瓙鑺傜偣鍙樺寲娑堟伅銆備竴鏃︽湁鏈哄櫒鎸傛帀锛岃鏈哄櫒涓?zookeeper 鐨勮繛鎺ユ柇寮€锛屽叾鎵€鍒涘缓鐨勪复鏃剁洰褰曡妭鐐硅鍒犻櫎锛屾墍鏈夊叾浠栨満鍣ㄩ兘鏀跺埌閫氱煡锛氭煇涓厔寮熺洰褰曡鍒犻櫎锛屼簬鏄紝鎵€鏈変汉閮界煡閬擄細瀹冧笂鑸逛簡銆?/span>

鏂版満鍣ㄥ姞鍏ヤ篃鏄被浼硷紝鎵€鏈夋満鍣ㄦ敹鍒伴€氱煡锛氭柊鍏勫紵鐩綍鍔犲叆锛宧ighcount 鍙堟湁浜嗭紝瀵逛簬绗簩鐐癸紝鎴戜滑绋嶅井鏀瑰彉涓€涓嬶紝鎵€鏈夋満鍣ㄥ垱寤轰复鏃堕『搴忕紪鍙风洰褰曡妭鐐癸紝姣忔閫夊彇缂栧彿鏈€灏忕殑鏈哄櫒浣滀负 master 灏卞ソ銆?/span>

Zookeeper 鍒嗗竷寮忛攣锛堟枃浠剁郴缁熴€侀€氱煡鏈哄埗锛?/span>

鏈変簡 zookeeper 鐨勪竴鑷存€ф枃浠剁郴缁燂紝閿佺殑闂鍙樺緱瀹规槗銆傞攣鏈嶅姟鍙互鍒嗕负涓ょ被锛屼竴涓槸淇濇寔鐙崰锛屽彟涓€涓槸鎺у埗鏃跺簭銆?/span>

瀵逛簬绗竴绫伙紝鎴戜滑灏?zookeeper 涓婄殑涓€涓?znode 鐪嬩綔鏄竴鎶婇攣锛岄€氳繃 createznode鐨勬柟寮忔潵瀹炵幇銆傛墍鏈夊鎴风閮藉幓鍒涘缓 /distribute_lock 鑺傜偣锛屾渶缁堟垚鍔熷垱寤虹殑閭ｄ釜瀹㈡埛绔篃鍗虫嫢鏈変簡杩欐妸閿併€傜敤瀹屽垹闄ゆ帀鑷繁鍒涘缓鐨?distribute_lock 鑺傜偣灏遍噴鏀惧嚭閿併€?/span>

瀵逛簬绗簩绫伙紝 /distribute_lock 宸茬粡棰勫厛瀛樺湪锛屾墍鏈夊鎴风鍦ㄥ畠涓嬮潰鍒涘缓涓存椂椤哄簭缂栧彿鐩綍鑺傜偣锛屽拰閫?master 涓€鏍凤紝缂栧彿鏈€灏忕殑鑾峰緱閿侊紝鐢ㄥ畬鍒犻櫎锛屼緷娆℃柟渚裤€?/span>

Zookeeper 闃熷垪绠＄悊锛堟枃浠剁郴缁熴€侀€氱煡鏈哄埗锛?/span>

涓ょ绫诲瀷鐨勯槦鍒楋細

锛?锛夊悓姝ラ槦鍒楋紝褰撲竴涓槦鍒楃殑鎴愬憳閮借仛榻愭椂锛岃繖涓槦鍒楁墠鍙敤锛屽惁鍒欎竴鐩寸瓑寰呮墍鏈夋垚鍛樺埌杈俱€?/span>

锛?锛夐槦鍒楁寜鐓?FIFO 鏂瑰紡杩涜鍏ラ槦鍜屽嚭闃熸搷浣溿€?/span>

绗竴绫伙紝鍦ㄧ害瀹氱洰褰曚笅鍒涘缓涓存椂鐩綍鑺傜偣锛岀洃鍚妭鐐规暟鐩槸鍚︽槸鎴戜滑瑕佹眰鐨勬暟鐩€?/span>

绗簩绫伙紝鍜屽垎甯冨紡閿佹湇鍔′腑鐨勬帶鍒舵椂搴忓満鏅熀鏈師鐞嗕竴鑷达紝鍏ュ垪鏈夌紪鍙凤紝鍑哄垪鎸夌紪鍙枫€傚湪鐗瑰畾鐨勭洰褰曚笅鍒涘缓 PERSISTENT_SEQUENTIAL 鑺傜偣锛屽垱寤烘垚鍔熸椂Watcher 閫氱煡绛夊緟鐨勯槦鍒楋紝闃熷垪鍒犻櫎搴忓垪鍙锋渶灏忕殑鑺傜偣鐢ㄤ互娑堣垂銆傛鍦烘櫙涓媄ookeeper 鐨?znode 鐢ㄤ簬娑堟伅瀛樺偍锛寊node 瀛樺偍鐨勬暟鎹氨鏄秷鎭槦鍒椾腑鐨勬秷鎭唴瀹癸紝SEQUENTIAL 搴忓垪鍙峰氨鏄秷鎭殑缂栧彿锛屾寜搴忓彇鍑哄嵆鍙€傜敱浜庡垱寤虹殑鑺傜偣鏄寔涔呭寲鐨勶紝鎵€浠ヤ笉蹇呮媴蹇冮槦鍒楁秷鎭殑涓㈠け闂銆?/span>

29. Zookeeper 閮芥湁鍝簺鍔熻兘锛?/p>

闆嗙兢绠＄悊锛氱洃鎺ц妭鐐瑰瓨娲荤姸鎬併€佽繍琛岃姹傜瓑锛?/span>

涓昏妭鐐归€変妇锛氫富鑺傜偣鎸傛帀浜嗕箣鍚庡彲浠ヤ粠澶囩敤鐨勮妭鐐瑰紑濮嬫柊涓€杞€変富锛屼富鑺傜偣閫変妇璇寸殑灏辨槸杩欎釜閫変妇鐨勮繃绋嬶紝浣跨敤 Zookeeper 鍙互鍗忓姪瀹屾垚杩欎釜杩囩▼锛?/span>

鍒嗗竷寮忛攣锛歓ookeeper 鎻愪緵涓ょ閿侊細鐙崰閿併€佸叡浜攣銆傜嫭鍗犻攣鍗充竴娆″彧鑳芥湁涓€涓嚎绋嬩娇鐢ㄨ祫婧愶紝鍏变韩閿佹槸璇婚攣鍏变韩锛岃鍐欎簰鏂ワ紝鍗冲彲浠ユ湁澶氱嚎绾跨▼鍚屾椂璇诲悓涓€涓祫婧愶紝濡傛灉瑕佷娇鐢ㄥ啓閿佷篃鍙兘鏈変竴涓嚎绋嬩娇鐢ㄣ€俍ookeeper 鍙互瀵瑰垎甯冨紡閿佽繘琛屾帶鍒躲€?/span>

30. 璇翠竴涓?Zookeeper 鐨勯€氱煡鏈哄埗锛?/p>

client 绔細瀵规煇涓?znode 寤虹珛涓€涓?watcher 浜嬩欢锛屽綋璇?znode 鍙戠敓鍙樺寲鏃讹紝杩欎簺 client 浼氭敹鍒?zk 鐨勯€氱煡锛岀劧鍚?client 鍙互鏍规嵁 znode 鍙樺寲鏉ュ仛鍑轰笟鍔′笂鐨勬敼鍙樼瓑銆?/span>

31. Zookeeper 鍜?Dubbo 鐨勫叧绯伙紵

Zookeeper鐨勪綔鐢細

dubbo锛?/span>

鏄鐞嗕腑闂村眰鐨勫伐鍏凤紝鍦ㄤ笟鍔″眰鍒版暟鎹粨搴撻棿鏈夐潪甯稿鏈嶅姟鐨勬帴鍏ュ拰鏈嶅姟鎻愪緵鑰呴渶瑕佽皟搴︼紝dubbo鎻愪緵涓€涓鏋惰В鍐宠繖涓棶棰樸€?br class="mq-750">娉ㄦ剰杩欓噷鐨刣ubbo鍙槸涓€涓鏋讹紝鑷充簬浣犳灦瀛愪笂鏀句粈涔堟槸瀹屽叏鍙栧喅浜庝綘鐨勶紝灏卞儚涓€涓苯杞﹂鏋讹紝浣犻渶瑕侀厤浣犵殑杞瓙寮曟搸銆傝繖涓鏋朵腑瑕佸畬鎴愯皟搴﹀繀椤昏鏈変竴涓垎甯冨紡鐨勬敞鍐屼腑蹇冿紝鍌ㄥ瓨鎵€鏈夋湇鍔＄殑鍏冩暟鎹紝浣犲彲浠ョ敤zk锛屼篃鍙互鐢ㄥ埆鐨勶紝鍙槸澶у閮界敤zk銆?/span>

zookeeper鍜宒ubbo鐨勫叧绯伙細

Dubbo 鐨勫皢娉ㄥ唽涓績杩涜鎶借薄锛屽畠鍙互澶栨帴涓嶅悓鐨勫瓨鍌ㄥ獟浠嬬粰娉ㄥ唽涓績鎻愪緵鏈嶅姟锛屾湁 ZooKeeper锛孧emcached锛孯edis 绛夈€?/span>

鍑哄锛歨ttps://blog.csdn.net/ThinkWon/article/details/104397719

寰€鏈熸帹鑽?/span>