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Re: log - MapReduce - [mail # user]
...This basically happens while running a mapreduce job. When a map reduce job is triggered the job files are put in hdfs with high replication ( replication is controlled by  - 'mapred.su...
   Author: Bejoy Ks, 2013-04-19, 09:21
Re: Physically moving HDFS cluster to new - MapReduce - [mail # user]
...Adding on to the comments  You might need to update the etc-hosts with new values. If the host name changes as well, you may need to update the  fs.default.name and mapred.job.trac...
   Author: Bejoy Ks, 2013-04-18, 05:27
Re: Adjusting tasktracker heap size? - MapReduce - [mail # user]
...Hi Marcos,  You need to consider the slots based on the available memory  Available Memory = Total RAM - (Memory for OS + Memory for Hadoop Daemons like DN,TT + Memory for other se...
   Author: Bejoy Ks, 2013-04-17, 12:23
Re: How to improve performance of this cluster - MapReduce - [mail # user]
...Hi Geelong  Let me just put in my thoughts here  You have 8G of RAM. But you have 8+8 = 16 slots with task jvm size of 1G. This means if all slots are utilized simultaneously then ...
   Author: Bejoy Ks, 2013-04-17, 10:39
Re: How to change secondary namenode location in Hadoop 1.0.4? - MapReduce - [mail # user]
...Hi Henry  You can change the secondary name node storage location by overriding the property 'fs.checkpoint.dir' in your core-site.xml   On Wed, Apr 17, 2013 at 2:35 PM, Henry Hung...
   Author: Bejoy Ks, 2013-04-17, 10:09
Re: Why the cluster stays at State: INITIALIZING - HDFS - [mail # user]
...If there is some critical writes to be done, you can force the cluster out of safe mode.  hadoop dfsadmin -safemode leave  Considering your ratio of reported blocks and if you have...
   Author: Bejoy Ks, 2013-04-17, 04:12
[expand - 1 more] - Re: VM reuse! - HDFS - [mail # user]
...When you process larger data volumes, this is the case mostly. :)   Say you have a job with smaller input size and if you have  2 blocks on a single node and then the JT may schedu...
   Author: Bejoy Ks, 2013-04-16, 14:44
Re: HW infrastructure for Hadoop - MapReduce - [mail # user]
...+1 for "Hadoop Operations"   On Tue, Apr 16, 2013 at 3:57 PM, MARCOS MEDRADO RUBINELLI  wrote:  ...
   Author: Bejoy Ks, 2013-04-16, 11:20
Re: Submitting mapreduce and nothing happens - MapReduce - [mail # user]
...Hi Amit  Are you seeing any errors or warnings on JT logs?  Regards Bejoy KS...
   Author: Bejoy Ks, 2013-04-16, 07:30
Re: Unexpected Hadoop behavior: map task re-running after reducer has been running - Hadoop - [mail # user]
...Hi David  The issue with the maps getting re triggered is because one of the node where map outputs are stored are getting lost during reduce phase. As a result of this the map outputs ...
   Author: Bejoy Ks, 2013-03-11, 13:16
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