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Re: start hadoop slave over WAN - Hadoop - [mail # user]
...login your remote datanode and start the datanode manually to see what happen.  start HDFS based on the WAN is not as easy as on a cluster. There are many issues. datanode log should be...
   Author: Chen He, 2012-03-30, 22:38
Re: Article - Hadoop - [mail # dev]
...sounds interesting. Need more detail  On Tue, Mar 20, 2012 at 2:19 PM, shashwat shriparv  wrote:  ...
   Author: Chen He, 2012-03-20, 19:58
[expand - 1 more] - Re: mapred.map.tasks vs mapred.tasktracker.map.tasks.maximum - Hadoop - [mail # user]
...if you do not specify  setNumMapTasks, by default, system will use the number you configured  for "mapred.map.tasks" in the conf/mapred-site.xml file.  On Fri, Mar 9, 2012 at ...
   Author: Chen He, 2012-03-10, 02:19
Re: mapred.tasktracker.map.tasks.maximum not working - Hadoop - [mail # user]
...you set the " mapred.tasktracker.map.tasks.maximum " in your job means nothing. Because Hadoop mapreduce platform only checks this parameter when it starts. This is a system configuration. &...
   Author: Chen He, 2012-03-10, 02:16
Re: Incompatible namespaceIDs after formatting namenode - Hadoop - [mail # user]
...For short, here is a script that may be useful for your to remove hdfs directory on DNs from your headnode.  for each DN hostname    do       ssh root@[DN hostn...
   Author: Chen He, 2012-01-15, 20:16
Re: dual power for hadoop in datacenter? - Hadoop - [mail # user]
...If you configure your replica number as 3 or more. I would suggest you keep half of your nodes with dual power on each rack, especially node with larger or more disks. As well as your nameno...
   Author: Chen He, 2012-01-09, 17:03
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