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Re: How to make the setting changes works - MapReduce - [mail # user]
...I have already give full permission for that dir.I think this maybe caused by reformatting the NN.this will lead to different Id of NN and DN — Sent from Mailbox for iPhone  On Thu, Apr...
   Author: 姚吉龙, 2013-04-25, 04:01
Error about MR task when running 2T data - MapReduce - [mail # user]
...Hi Everyone  Today I am testing about 2T data on my cluster, there several failed map task and reduce task on same node Here is the log  Map failed:  org.apache.hadoop.util.Di...
   Author: 姚吉龙, 2013-04-23, 07:11
How to run MRunit in Eclipse - MapReduce - [mail # user]
...Hi Everyone  Sorry to ask this again. I am confused about this issue for a long time,anyone know some detailed steps about the test.    BRs Geelong  ...
   Author: 姚吉龙, 2013-04-23, 01:57
Re: common error in map tasks - MapReduce - [mail # user]
...mainly it is caused by java.child.opt and the num of map task. — Sent from Mailbox for iPhone  On Tue, Apr 23, 2013 at 6:15 AM, kaveh minooie  wrote:  ...
[+ more]    Author: 姚吉龙, 2013-04-23, 00:28
Re: Errors about MRunit - MapReduce - [mail # user]
...I am the newer for MRunit and Maven I just google this issue and find a solution: http://stackoverflow.com/questions/12444663/hadoop-mrunit-throws-exception it said that we need to change th...
[+ more]    Author: 姚吉龙, 2013-04-21, 05:16
Re: Map‘s number with NLineInputFormat - MapReduce - [mail # user]
...The num of map is decided by the block size and your rawdata  — Sent from Mailbox for iPhone  On Sat, Apr 20, 2013 at 12:30 AM, YouPeng Yang  wrote:  ...
   Author: 姚吉龙, 2013-04-20, 00:39
How to install the MRunit - MapReduce - [mail # user]
...Hi everyone  How can I install the MRunit to do the unit test? Is there any requriement for the tool My hadoop version is :1.0.4 Except the MRunit, any other test tool available?  ...
   Author: 姚吉龙, 2013-04-18, 05:47
Re: Hadoop fs -getmerge - MapReduce - [mail # user]
...Use this command:hadoop fs -getmerge  <file in hdfs> <local> — Sent from Mailbox for iPhone  On Wed, Apr 17, 2013 at 10:40 PM, Fabio Pitzolu  wrote:  ...
   Author: 姚吉龙, 2013-04-17, 15:02
How to improve performance of this cluster - MapReduce - [mail # user]
...Hi everyone  We have a cluster of 31 datanodes with 1 namenode,each with 8-core cpu and 8G RAM I am studying the approach to improve the performance of this cluster.Now we have a datafi...
   Author: 姚吉龙, 2013-04-17, 09:42
Need help about the configuration optimization - MapReduce - [mail # user]
...Hi  I am a newer for hadoop, now we have 32 nodes for hadoop study I need to speed up the process of hadoop processing by finding the best configuration. For example: io.sort.mb  i...
   Author: 姚吉龙, 2013-04-15, 06:05
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