二、gearman及python客户端安装和使用

1.安装gearman

cd /usr/local/src/
wget https://launchpad.net/gearmand/trunk/0.33/+download/gearmand-0.33.tar.gz
tar xzvf gearmand-0.33.tar.gz
cd gearmand-0.33
./configure
make
make install

安装过程如果出现:configure: error: Unable to find libevent,需要yum install libevent-devel之后重试即可!

如果出现:libgearman/add.cc:53:23: error: uuid/uuid.h: No such file or directory 和libgearman/.libs/libgearman.so: undefined reference to `uuid_generate' 错误, 需要葱这里 http://sourceforge.net/projects/e2fsprogs/files/e2fsprogs/v1.42.5/ 下载并安装e2fsprogs, 注意configure的参数必须是:./configure --prefix=/usr/local/e2fsprogs --enable-elf-shlibs,然后把uuid目录拷过去 cp -r lib/uuid/    /usr/include/ 和 cp -rf lib/libuuid.so* /usr/lib 之后make clean重试即可!  

2.gearman的原理:Gearman最初在LiveJournal用于图片resize功能,由于图片resize需要消耗大量计算资源,因此需要调度到后端多台服务器执行,完成任务之后返回前端再呈现到界面。Gearman分布式任务实现原理上只用到2个字段,function name和data。function name即任务名称,由client传给job server, job server根据function name选择合适的worker节点来执行。


3.简单测试gearman,参考http://gearman.org/index.php?id=getting_started

    3.1启动gearman的server,gearman运行时必须,否则报connetion错误。

gearmand -d

    3.2启动worker

gearman -w -f wc -- wc -l

    -w 代表启动的是worker,-f wc 代表启动一个task名字为wc, -- wc -l表示这个task是做wc -l 统计行数。

    3.3在另外一个终端启动client

gearman -f wc < /etc/passwd

    表示调用名字为wc的worker,参数为/etc/passwd,意思让worker统计/etc/passwd文件的行数。

4.gearman的python客户端

wget http://pypi.python.org/packages/source/g/gearman/gearman-2.0.2.tar.gz#md5=3847f15b763dc680bc672a610b77c7a7
tar xvzf  gearman-2.0.2.tar.gz
python setup.py install

worker.py

import os
import gearman
import math

class CustomGearmanWorker(gearman.GearmanWorker):  
    def on_job_execute(self, current_job):  
        print "Job started" 
        return super(CustomGearmanWorker, self).on_job_execute(current_job)  
 
def task_callback(gearman_worker, job):  
    print job.data 
    return job.data
 
new_worker = CustomGearmanWorker(['192.168.0.181:4730'])  
new_worker.register_task("echo", task_callback)  
new_worker.work()

client.py

from gearman import GearmanClient

new_client = GearmanClient(['192.168.0.181:4730'])
current_request = new_client.submit_job('echo', 'foo')
new_result = current_request.result
print new_result

注:我的本机IP是192.168.0.181,gearman server端默认开启端口4730

启动worker:

[root@centos-181 demo]# python worker.py
Job started
foo

启动client,在另外一个终端

[root@centos-181 demo]# python client.py 
foo
 

参考:

http://pypi.python.org/pypi/gearman/

http://timyang.net/linux/gearman-monitor/

http://blog.csdn.net/robby213/article/details/6437739

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转载自willvvv.iteye.com/blog/1580181