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RE: No Mapper but Reducer - MapReduce - [mail # user]
...Hi Bejoy,         It is possible to execute a job with no mappers and reducers alone.      You can try this by giving the empty directory as input for the ...
   Author: Devaraj K, 2011-09-07, 08:54
[MAPREDUCE-2866] "Ignoring 'duplicate' heartbeat from tracker_x:localhost/127.0.0.1:35419'; resending the previous 'lost' response" message is coming continuously for some time - MapReduce - [issue]
http://issues.apache.org/jira/browse/MAPREDUCE-2866    Author: Devaraj K, 2011-08-24, 13:30
[MAPREDUCE-2685] Hadoop-Mapreduce-trunk build is failing - MapReduce - [issue]
...Hadoop-Mapreduce-trunk has been failing for long time. https://builds.apache.org/job/Hadoop-Mapreduce-trunk/737/org.apache.hadoop.cli.TestMRCLI.testAll is failing since Build #6972011-07-14 ...
http://issues.apache.org/jira/browse/MAPREDUCE-2685    Author: Devaraj K, 2011-08-22, 14:51
[MAPREDUCE-2799] [MR-279] NPE is throwing on job -status <Invalid Job ID/Job Id doesn't exist> - MapReduce - [issue]
...Exception in thread "main" java.lang.NullPointerException        at org.apache.hadoop.mapred.ClientServiceDelegate.refreshProxy(ClientServiceDelegate.java:113) ...
http://issues.apache.org/jira/browse/MAPREDUCE-2799    Author: Devaraj K, 2011-08-10, 17:35
RE: Subscription for contribution in map-reduce. - MapReduce - [mail # dev]
...Hi Balakrishnan,   Please go through this below link to find the process of contributing to Apache Hadoop projects.  http://wiki.apache.org/hadoop/HowToContribute   Devaraj K ...
   Author: Devaraj K, 2011-08-10, 10:50
RE: RE: Can I use the cores of each CPU to be the datanodes instead of CPU? - MapReduce - [mail # user]
...Hi Jun Tan,        As Subroto pointed Hadoop doesn’t  depend on the number of cores  but we can tune the parameters based on the no of cores and type of job we ...
   Author: Devaraj K, 2011-08-08, 09:37
RE: Re: what happen in my hadoop cluster? - MapReduce - [mail # user]
...Can you check the name node logs what is going on with name node?    When we start the name node, it will be in the while initializing and after some time it will be turned off aut...
   Author: Devaraj K, 2011-07-27, 08:26
Problem while running eclipse-files for Next Gen Mapreduce branch - MapReduce - [mail # dev]
...Hi,        I am getting this below errors when I try to generate eclipse files using eclipse-files target. Can anybody help me?        Buildfile: D:\s...
   Author: Devaraj K, 2011-07-08, 14:00
[MAPREDUCE-2647] Memory sharing across all the Tasks in the Task Tracker to improve the job performance - MapReduce - [issue]
...If all the tasks (maps/reduces) are using (working with) the same additional data to execute the map/reduce task, each task should load the data into memory individually and read the data. I...
http://issues.apache.org/jira/browse/MAPREDUCE-2647    Author: Devaraj K, 2011-07-06, 10:59
RE: MapReduce output could not be written - MapReduce - [mail # user]
...Check the datanode logs, whether it is registered with namenode or not. At the same time you can check any problem occurred while initializing the datanode. If it registers successfully it s...
   Author: Devaraj K, 2011-07-05, 14:33
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