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ZOOKEEPER-3318:[CLI way]Add a complete backup mechanism for zookeeper internal

- `takeSnapshot` api is just like `sync`, only supports async call. > for no-realtime backup. write a new tool/shell: zkBackup.sh which is the reverse proces of the zkCleanup.sh for no-realtime...

ZOOKEEPER-3499:Add a complete backup mechanism for zookeeper internal(admin server way)

- the description about this PR can be found in its document - Link to [PR-917](https://github.com/apache/zookeeper/pull/917) - more details in the [ZOOKEEPER-3499](https://issues.apache.org/jira/browse/ZOOKEEPER-3499)

ZOOKEEPER-4521: add PULL_REQUEST_TEMPLATE.md for zookeeper project

- Standardize the pull request writing

Backport ZOOKEEPER-4377 to Branch 3.6

Backport [ZOOKEEPER-4377](https://github.com/apache/zookeeper/pull/1764) to Branch 3.6 to make the client has upward compatibility

ZOOKEEPER-2590:exists() should check read ACL permission

- `exist` is a kind of read operation, so it should check read ACL permission. In the original release, only two operation don't check ACL permission(`exist` and `getAcl`) which is...

ZOOKEEPER-3611:addWatch api supports all watch event type, strengthen the corresponding CLI and add a documentation

- add three new modes: `STANDARD_CHILD`,`STANDARD_DATA`, `STANDARD_EXIST` to `addWatch()` api to keep behavior and semantics consistency with the original tradational one-time watch. For example: `zk.getChildren(path, watch, stat);` equals to `zk.addWatch(path,...

ZOOKEEPER-3616:add a new documentation: zookeeperCodingGuide.md

- I refer the code guide of [Bookkeeper](https://github.com/apache/bookkeeper/blob/master/site/community/coding_guide.md). Looking forward to others‘ supplements - more details in the [ZOOKEEPER-3616](https://issues.apache.org/jira/browse/ZOOKEEPER-3616)

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