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Re: Sqoop issue related to Hadoop - HDFS - [mail # user]
...Hi Raj  The easiest approach to pull out task log is using JT web UI.  Got to JT web UI, drill down on the sqoop job. You'll get a list of failed/killed tasks, your failed thask wo...
   Author: bejoy.hadoop@..., 2013-08-29, 06:06
Re: Hadoop Installation Mappers setting - HDFS - [mail # user]
...When you take a mapreduce tasks, you need CPU cycles to do the processing, not just memory.  So ideally based on the processor type(hyperthreaded or not) compute the available cores. Th...
   Author: bejoy.hadoop@..., 2013-05-23, 19:15
Re: How to balance reduce job - HDFS - [mail # user]
...Yes, That is a valid point.  The partitioner might do non uniform distribution and reducers can be unevenly loaded.  But this doesn't change the number of reducers and its distribu...
   Author: bejoy.hadoop@..., 2013-04-17, 06:18
Re: How to configure mapreduce archive size? - HDFS - [mail # user]
...Also, You need to change the value for 'local.cache.size' in core-site.x.l not in core-default.xml.  If you need to override any property in config files do it in *-site.xml not in *-de...
   Author: bejoy.hadoop@..., 2013-04-16, 18:11
Re: Question regarding hadoop jar command usage - HDFS - [mail # user]
...Hi  Any node would submit the job to JobTracker which distributes the jar to TaskTrackers and individual tasks are executed on nodes across the cluster.  MR tasks are executed acro...
   Author: bejoy.hadoop@..., 2013-03-13, 17:16
Re: ISSUE :Hadoop with HANA using sqoop - HDFS - [mail # user]
...Hi Sameer  The query  "SELECT t.* FROM hgopalan.hana_training AS t WHERE 1=0"  Is first executed by SQOOP  to fetch the metadata.   The actual data fetch happens as ...
   Author: bejoy.hadoop@..., 2013-02-21, 07:36
Re: Hadoop Cluster - HDFS - [mail # user]
...Hi Savitha  HA is a new feature n hadoop introduced in Hadoop 2.x releases. So It is a new feature on top of Hadoop cluster.  Ganglia is one of the widely used tools to monitor the...
   Author: bejoy.hadoop@..., 2013-01-22, 18:07
Re: hadoop namenode recovery - HDFS - [mail # user]
...Hi Panshul  SecondaryNameNode is rather known as check point node. At periodic intervals it merges the editlog from NN with FS image to prevent the edit log from growing too large. This...
   Author: bejoy.hadoop@..., 2013-01-15, 03:11
Re: Map Failure reading .gz (gzip) files - HDFS - [mail # user]
...Hi Terry  When the file is unzipped and zipped, what is the number of map tasks running in each case?  If the file is large, I assume the below should be the case.  gz is not ...
   Author: bejoy.hadoop@..., 2013-01-15, 03:02
Re: Can spill to disk be in compressed format to reduce I/O? - HDFS - [mail # user]
...Hi Frank        Is map output compression enabled?  The config param would be like mapred.map.output.compress=true (It is from my memory, Please cross check)  F...
   Author: bejoy.hadoop@..., 2012-01-12, 15:49
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