ZooKeeper可以在znode上設置配額限制。如果超出了配置限制，ZooKeeper將會在log日志中打印WARN日志。如果超出配額限制，并不會停止行為操作。

ZooKeeper的配額是存儲在/zookeeper/quota路徑下的。可以通過ZooKeeper client APIs或者ZooKeeper Java Shell來進行set，list，delete配額。

下面舉一個例子說明：

[zk: localhost:2181(CONNECTED) 3] setquota -n 2 /yandufeng_quota Comment: the parts are option -n val 2 path /yandufeng_quota [zk: localhost:2181(CONNECTED) 4] [zk: localhost:2181(CONNECTED) 4] [zk: localhost:2181(CONNECTED) 4] listquota /yandufeng_yandufeng_quota yandufeng_test [zk: localhost:2181(CONNECTED) 4] listquota /yandufeng_quota absolute path is /zookeeper/quota/yandufeng_quota/zookeeper_limits Output quota for /yandufeng_quota count=2,bytes=-1 Output stat for /yandufeng_quota count=1,bytes=2 [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] create /yandufeng_yandufeng_quota yandufeng_test [zk: localhost:2181(CONNECTED) 5] create /yandufeng_quota/child1 "" Created /yandufeng_quota/child1 [zk: localhost:2181(CONNECTED) 6] create /yandufeng_yandufeng_quota yandufeng_test [zk: localhost:2181(CONNECTED) 6] create /yandufeng_quota/child2 "" Created /yandufeng_quota/child2 [zk: localhost:2181(CONNECTED) 7] create /yandufeng_yandufeng_quota yandufeng_test [zk: localhost:2181(CONNECTED) 7] create /yandufeng_quota/childchild2 child1 [zk: localhost:2181(CONNECTED) 7] create /yandufeng_quota/child3 "" Created /yandufeng_quota/child3

當你創建/yandufeng_quota/child3時，會在ZooKeeper的log日志中打印

2017-02-08 10:38:43,738 - WARN [CommitProcessor:10:DataTree@388] - Quota exceeded: /yandufeng_quota count=5 limit=2

?

你也可以執行

[zk: localhost:2181(CONNECTED) 18] delquota /yandufeng_quota

?來刪除這個配額

轉載于:https://www.cnblogs.com/yandufeng/p/6377099.html

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