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RE: Context Object in Map Reduce - MapReduce - [mail # user]
...If you are using new Mapper API (org.apache.hadoop.mapreduce.Mapper) for your Job, then you can get the configuration object from Context like "context.getConfiguration() ". If you are using...
   Author: Devaraj k, 2013-07-27, 02:56
RE: Node manager crashing when running an app requiring 100 containers on hadoop-2.1.0-beta RC0 - MapReduce - [mail # user]
...Hi Kishore,  It seems that system doesn't have enough resources to launch a new thread.  Could you check the system is affordable to launch the configured containers and try increa...
   Author: Devaraj k, 2013-07-25, 10:54
RE: Copy data from Mainframe to HDFS - MapReduce - [mail # user]
...Hi Balamurali,  As per my knowledge, there is nothing in the hadoop which does exactly as per your requirement.  You can write mapreduce jobs according to your functionality and su...
   Author: Devaraj k, 2013-07-23, 07:23
RE: setting mapred.task.timeout programmatically from client - MapReduce - [mail # user]
...'mapred.task.timeout' is deprecated configuration. You can use 'mapreduce.task.timeout' property to do the same.  You could set this configuration while submitting the Job using org.apa...
   Author: Devaraj k, 2013-07-23, 03:16
RE: subsicrbe - MapReduce - [mail # user]
...Hi Pradeep,  Please send mail to subscribe mail ids, after subscription if you have any queries you can reach to the corresponding  lists. You can find the subscribe mail ids in th...
   Author: Devaraj k, 2013-07-20, 04:26
RE: Incrementally adding to existing output directory - MapReduce - [mail # user]
...It seems, It is not taking the CutomOutputFormat for the Job. You need to set the custom output format class using the org.apache.hadoop.mapred.JobConf.setOutputFormat(Class theClass) API fo...
   Author: Devaraj k, 2013-07-18, 02:51
RE: hive task fails when left semi join - MapReduce - [mail # user]
...Hi,    In the given image, I see there are some failed/killed map& reduce task attempts. Could you check why these are failing, you can check further based on the fail/kill reason....
   Author: Devaraj k, 2013-07-16, 07:37
RE: Map slots and Reduce slots - MapReduce - [mail # user]
...These configurations cannot be changed dynamically. We need to configure these values for Tasks Tracker's before starting and cannot be changed after that. If we want to change these then TT...
   Author: Devaraj k, 2013-07-15, 02:10
RE: Taktracker in namenode failure - MapReduce - [mail # user]
...I think, there is mismatch of jar’s coming in the classpath for the map tasks when it runs in different machines. You can find out this, by giving some unique name for your Mapper class, Job...
   Author: Devaraj k, 2013-07-12, 10:07
RE: Failed to run wordcount on YARN - MapReduce - [mail # user]
...Hi Raymond,   In Hadoop 2.0.5 version, FileInputFormat new API doesn't support reading the files recursively in input dir. In supports only having the input dir with files. If the inpu...
   Author: Devaraj k, 2013-07-12, 08:24
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