How can I get parameters form mappers ?
I can't do it with jobconf, I've try it . -----邮件原件----- 发件人: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 代表 Chris Dyer 发送时间: 2007年11月7日 6:04 收件人: hadoop-user@lucene.apache.org; [EMAIL PROTECTED] 主题: Re: configuration for mappers? Hi Stu- Thanks for the tip! Chris On 11/3/07, Stu Hood <[EMAIL PROTECTED]> wrote: > > Hi Chris, > > A very comfortable way to pass configuration parameters to mappers is in > your JobConf. By using JobConf.set(String,String), you can set arbitrary > parameters that will be distributed to all mappers. > > In order to fetch these parameters in your Mapper, you will need to > override the MapReduceBase.configure(JobConf) method. The default > implementation of this method in MapReduceBase does nothing with the > configuration, but you can implement it to change the configuration of the > mapper by .get(String)'ing the parameters you stored and setting private > variables, etc. > > Good luck! > > Thanks, > Stu > > > -----Original Message----- > From: Chris Dyer <[EMAIL PROTECTED]> > Sent: Saturday, November 3, 2007 5:42pm > To: hadoop-user@lucene.apache.org > Subject: configuration for mappers? > > Hi hadoopers, > > What is the recommended way to send configuration type information > from the job client down to the individual map and reduce processes > that are running? I'd like to be able to specify a few options that > control the behavior of these processes, but I haven't been able to > find any documentation on how to do this. > > Thanks for any help! > > Chris > > > ___________________________________________________________ 雅虎邮箱传递新年祝福，个性贺卡送亲朋！ http://cn.mail.yahoo.com/gc/index.html?entry=5&souce=mail_mailletter_tagline
