gearman的安装启动及python API使用实例
本文讲述了gearman的安装启动及python API使用实例，对于网站建设及服务器维护来说非常有用！
一、概述：
Gearman是一款非常优秀的任务分发框架，可以用于分布式计算。具体的gearmand服务的安装启动及gearman的python 模块的安装以及简单示例如下：
操作系统：rnel 5.7
1. 首先，我们需要安装gearmand，在centos和rhel环境下，我们只需运行以下命令：
yum install gearmand -y
注意：如果不希望通过yum的方式来安装gearmand，可以通过源码编译安装，具体安装方法可以参考：http://www.jb51.net/article/51999.htm
安装完毕之后，就可以启动gearmand服务：
gearmand -p 4730 -L 10.22.10.90 --log-file=/tmp/gearmand-4730.log --pid-file=/tmp/gearmand-4730.pid -d
2. 安装python-gearman
gearman的python模块，下载地址为：https://pypi.python.org/pypi/gearman/2.0.2
我们可以用以下命令安装（两个命令均可，二选一）：
easy_install gearman
pip install gearman
或者也可以通过源码安装：
wget https://pypi.python.org/packages/source/g/gearman/gearman-2.0.2.tar.gz --no-check-certificate tar zxvf gearman-2.0.2.tar.gz cd gearman-2.0.2 python setup.py install
这样，我们就完成了python-gearman的安装。
二、使用示例：
下面，列举一个简单的python例子：
首先，我们需要编写一个worker，代码如下：
1.文件名：echoWorker.py
#!/usr/bin/env python
import os
import gearman
import math
class MyGearmanWorker(gearman.GearmanWorker):
def on_job_execute(self, current_job):
print "Job started"
print "===================\n"
return super(MyGearmanWorker, self).on_job_execute(current_job)
def task_callback(gearman_worker, gearman_job):
print gearman_job.data
print "-----------\n"
return gearman_job.data
my_worker = MyGearmanWorker(['10.22.10.47:4730'])
my_worker.register_task("echo", task_callback)
my_worker.work()
2.编写client，如下：
文件名：echoClient.py
#!/usr/bin/env python2.7
from gearman import GearmanClient
gearman_client = GearmanClient(['192.168.12.34:4730'])
gearman_request = gearman_client.submit_job('echo', 'test gearman')
result_data = gearman_request.result
print result_data
注意上面GearmanClient(['192.168.12.34:4730'])中的IP地址，需要根据实际启动gearmand服务的IP地址和端口号为准。
3.然后，我们运行以下命令:
python echoWorker.py python echoClient.py
至此，即可看到输出。
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