Zookeeper Watcher 鏈哄埗 -- 鏁版嵁鍙樻洿閫氱煡 ?

Posted 2020-12-18

鏍囩锛?a href='http://www.mamicode.com/so/1/getchild' title='getchild'>getchild   澶勭悊   涓嶅悓   create   exist   watcher   event   鍛婅瘔   鏀瑰彉   

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€?/p>

鐭ユ潵瀹炵幇鍒嗗竷寮忕殑閫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>

1銆佸鎴风娉ㄥ唽 watcher

2銆佹湇鍔＄澶勭悊 watcher

3銆佸鎴风鍥炶皟 watcher

Watcher 鐗规€ф€荤粨锛?/span>

1銆佷竴娆℃€?/p>

鏃犺鏄湇鍔＄杩樻槸瀹㈡埛绔紝涓€鏃︿竴涓?/span> Watcher 琚Е鍙戯紝Zookeeper 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?/span>

鍘嬪姏閮介潪甯稿ぇ銆?/span>

2銆佸鎴风涓茶鎵ц

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

3銆佽交閲?/p>

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?/p>

浣撳唴瀹广€?/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?/p>

璞″疄浣撲紶閫掑埌鏈嶅姟绔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?/p>

4銆亀atcher event 寮傛鍙戦€?watcher 鐨勯€氱煡浜嬩欢浠?server 鍙戦€佸埌 client 鏄紓姝?/p>

鐨勶紝杩欏氨瀛樺湪涓€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?/p>

缃戠粶寤惰繜鎴栧叾浠栧洜绱犲鑷村鎴风鍦ㄤ笉閫氱殑鏃跺埢鐩戝惉鍒颁簨浠讹紝鐢变簬 Zookeeper 鏈韩

鎻愪緵浜?/span> 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?/span> Zookeeper 涓嶈兘鏈熸湜鑳藉鐩戞帶鍒拌妭鐐规瘡娆＄殑鍙樺寲銆?/p>

Zookeeper 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€?/p>

5銆佹敞鍐?watcher getData銆乪xists銆乬etChildren

6銆佽Е鍙?watcher create銆乨elete銆乻etData

7銆佸綋涓€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?/p>

褰撲笌涓€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?/span> 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?/span>watch 鍙兘浼氫涪澶憋細瀵逛簬涓€涓湭鍒涘缓鐨?znode

鐨?/span> 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?/span> watch 浜嬩欢鍙兘浼氳涓㈠け銆?/p>