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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
RE: hadoop job is run slow in multicluster configuration - MapReduce - [mail # user]
...Can you check the logs in the task tracker machine, what is happening to the task execution and status of the task?     Devaraj K   This e-mail and its attachments contain con...
   Author: Devaraj K, 2011-07-01, 12:11
RE: Relation between Mapper and Combiner - MapReduce - [mail # user]
...Hi Lucian,                 For every map task, combiner will be executed multiple times before writing the map output. Combine step is not a separate ...
   Author: Devaraj K, 2011-07-01, 11:47
RE: Map job hangs indefinitely - MapReduce - [mail # user]
...With this info it is difficult to find out where the problem is coming. Can you check the job tracker and task tracker logs related to these jobs?      Devaraj K    ...
   Author: Devaraj K, 2011-06-22, 06:43
RE: Tasktracker denied communication with jobtracker - MapReduce - [mail # user]
...Hi Virajith,              This exception will be thrown when the host name present in the file which is the value for the property "mapred.hosts.exclude". ...
   Author: Devaraj K, 2011-06-22, 05:32
[MAPREDUCE-2464] NullPointerException is coming in the job tracker when job tracker resends the previous heartbeat response. - MapReduce - [issue]
...Over the network, the heartbeat response sent by Job Tracker to Task Tracker might get lost. When Task Tracker sends the old heart beat again to Job Tracker then Job Tracker finds and ignore...
http://issues.apache.org/jira/browse/MAPREDUCE-2464    Author: Devaraj K, 2011-05-02, 19:13
[MAPREDUCE-2306] It is better to give Job start time instead of JobTracker start time in the JobTracker UI->Home. - MapReduce - [issue]
...In the log details, for each job it is giving JobTracker start time and also In the JobTracker UI->Home it is giving Start time of JobTracker. It is better to give JobId start time instea...
http://issues.apache.org/jira/browse/MAPREDUCE-2306    Author: Devaraj K, 2011-04-09, 06:28
[MAPREDUCE-2387] Potential Resource leak in IOUtils.java - MapReduce - [issue]
...IOUtils.javatry {      copyBytes(in, out, buffSize);    } finally {      if(close) {        out.close(); ...
http://issues.apache.org/jira/browse/MAPREDUCE-2387    Author: Devaraj K, 2011-03-16, 09:51
[MAPREDUCE-2261] Fair Multiple Task Assignment Scheduler (Assigning multiple tasks per heart beat) - MapReduce - [issue]
...     Functionality wise the Fair Multiple Task Assignment Scheduler behaves the same way except the assignment of Tasks. Instead of assigning a single Task per heartbeat, it c...
http://issues.apache.org/jira/browse/MAPREDUCE-2261    Author: Devaraj K, 2011-03-16, 05:13
[MAPREDUCE-2299] In the Job Tracker UI -> task details page, machine and logs links are navigating to page not found error. - MapReduce - [issue]
...1. In the page showing All task attempts-On clicking of machine link is navigating to page not found error.2. In the page showing All task attempts-On clicking of Task logs Link is navigatin...
http://issues.apache.org/jira/browse/MAPREDUCE-2299    Author: Devaraj K, 2011-02-24, 15:53
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB