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Re: Which version to choose - MapReduce - [mail # user]
...I am using hadoop 0.20.2 for data analysis for my company. I did not upgrade to hadoop 0.21 since the note in http://hadoop.apache.org/common/releases.html#23+August%2C+2010%3A+release+0.21....
   Author: jingguo yao, 2010-12-22, 13:53
Re: distcp fails with ConnectException - MapReduce - [mail # user]
...A few things worth of a check.  1. Can  hadoop-A connect to hadoop-B usng 8020 port? You can check firewall settings. Maybe your firewall settings allow ssh and ping. But port 8020...
   Author: jingguo yao, 2010-12-07, 01:52
Re: Starting a Hadoop job programtically - MapReduce - [mail # user]
...A possible cause is that name node and job tracker on server A are bound to a local address such as which server B can't see.  If you are using linux, you can check /etc/hosts...
   Author: jingguo yao, 2010-11-25, 08:42
Re: How to set the number of tasks running on each slave? - MapReduce - [mail # user]
...mapred.tasktracker.map.tasks.maximum: how many map tasks can be run concurrently on a map-reduce slave node.  mapred.tasktracker.reduce.tasks.maximum: how many reduce tasks can be run c...
   Author: jingguo yao, 2010-11-16, 05:56
Re: running job without jar - MapReduce - [mail # user]
...As far as I know, there is no way to run a Java class on a cluster.  To copy user specified files to different nodes, you can use Distributed Cache.  On Tue, Oct 26, 2010 at 3:01 P...
   Author: jingguo yao, 2010-10-26, 07:18
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