python 訪問 zookeeper

python 訪問 zookeeper

1.安裝：
zookeeper python客戶端依賴c客戶端，所以要先安裝c版本客戶端

	> wget -c http://apache.fayea.com/zookeeper/zookeeper-3.4.10/zookeeper-3.4.12.tar.gz
	> tar -zxvf zookeeper-3.4.12.tar.gz
	> cd zookeeper-3.4.12/src/c
	> ./configure
	> make
	> make install

安裝支持包： pip install zkpython

2.測試

	[root@otter c]# python
	Python 2.7.5 (default, Oct 30 2018, 23:45:53) 
	[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
	Type "help", "copyright", "credits" or "license" for more information.
	>>> import zookeeper
	Traceback (most recent call last):
	  File "<stdin>", line 1, in <module>
	  File "build/bdist.linux-x86_64/egg/zookeeper.py", line 7, in <module>
	  File "build/bdist.linux-x86_64/egg/zookeeper.py", line 6, in __bootstrap__
	ImportError: libzookeeper_mt.so.2: cannot open shared object file: No such file or directory
	>>> 

解決方法:

將下面這句加入到 /etc/profile 最後一行（libzookeeper_mt.so在/usr/local/lib下面):

	export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib	

（在crontab 中添加 自動作業，也需要在sh 文件中添加此行腳本，不然不會執行）

然後執行:

$ . /etc/profile

import zookeeper

hader=zookeeper.init("localhost:2181")	#登錄到客戶端
channels=zookeeper.get_children(hader,'/otter/channel') #獲取目錄
stat=zookeeper.get(hader,'/otter/channel/1')	#獲取節點信息

python3 安裝zookeeper

>>> import zookeeper
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /usr/local/lib/python3.6/site-packages/zkpython-0.4.2-py3.6-linux-x86_64.egg/zookeeper.cpython-36m-x86_64-linux-gnu.so: undefined symbol: PyInt_AsLong
>>> quit()

解決方法：

用 zookeeper安裝包 的 zookeeper.c 文件替換掉 zkpython 的包文件 zookeeper.c

[root@otter c]# cp /opt/download/zookeeper-3.4.12/src/contrib/zkpython/src/c/zookeeper.c /opt/download/zkpython-0.4.2/zookeeper.c

然後進入zkpythton目錄

python setup.py install 進行安裝

之後import zookeeper測試通過

[root@otter zookeeper-3.4.12]# python3
Python 3.6.0a1 (default, Apr 15 2019, 14:50:24) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import zookeeper
>>> 

示例代碼：(列出 /otter/channel ,並查詢其狀態)

hader=zookeeper.init("localhost:2181")
channels=zookeeper.get_children(hader,'/otter/channel')
for temp in channels:
  stat=zookeeper.get(hader,'/otter/channel/'+temp)

zookeeper 命令不多，也比較簡單，這裏不一一測試。