maoling opened a new pull request #790: ZOOKEEPER-3167:add an API and the corresponding CLI to get total count of recursive sub nodes under a specific path URL: https://github.com/apache/zookeeper/pull/790 - Thanks the original patch from [TyqITstudent ](https://github.com/TyqITstudent). - the `getAllChildrenNumber` api supports `sync` and `async`, don't support `watch`. since` getChildren()` can get the number of the first level,to keep the api short and clean,don't use a boolean flag to let this api get the number of the first level child. - the implements using the` parallelStream()` which have the almost `4x` speed up than `forEach`(I test),it will return at once even a millons of keys. - `getAllChildrenNumber` doesn't have a `synchronized `lock, to avoid holding the `nodes` for a long time,so when too many concurrent writes, the number will be not very precise. - about `getAllChildrenNumber` CLI: > [zk: localhost:2181(CONNECTED) 6] getAllChildrenNumber /zookeeper > 2 > [zk: localhost:2181(CONNECTED) 7] getAllChildrenNumber /zookeeper/quota > 0 - there is no good place to document the new api, I create a seperate jira-[ZOOKEEPER-3259](https://issues.apache.org/jira/projects/ZOOKEEPER/issues/ZOOKEEPER-3259).
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