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Performance issue in CDH4.0.1 with 32 core machine. - MapReduce - [mail # user]
...Hi Guys,  We are running hadoop cluster with Intel xeon 32 core machine, 64 GB Ram, 8x3TB HDD, we are using CDH4.0.1, we regularly monitoring machine, we have configured 30 mappers per ...
   Author: Dhanasekaran Anbalagan, 2013-02-13, 09:21
Decommissioning Nodes in Production Cluster. - MapReduce - [mail # user]
...Hi Guys,  It's recommenced do with removing one the datanode in production cluster. via Decommission the particular datanode. please guide me.  -Dhanasekaran,  Did I learn som...
   Author: Dhanasekaran Anbalagan, 2013-02-12, 11:50
Fair Scheduler Performance issue. - MapReduce - [mail # user]
...Hi Guys,  We have using CDH4.0.1, we having quite monitoring with fair scheduler with not handle with more than one lakh mapper.  Is the Bug or configuration tweaking please guide ...
   Author: Dhanasekaran Anbalagan, 2013-02-08, 09:26
[Job tracker Start time] problem in jobtracker page - MapReduce - [mail # user]
...Hi Guys,  We have using CDH4.0.1, we have running running multiple jobs, We have look the job tracker page showing wrong Job tracker Start time same for all the running job.  http:...
   Author: Dhanasekaran Anbalagan, 2013-02-07, 07:56
How to find HDFS folders file count. - MapReduce - [mail # user]
...Hi Guys,  We have done moving local file to HDFS hadoop fs -copyFromLocal  we have verified some of the file missing in the HDFS, We want validate source to destination.  We h...
   Author: Dhanasekaran Anbalagan, 2013-02-06, 10:26
Best way handle hadoop Java heap size space - MapReduce - [mail # user]
...Hi Guys,  We have configured many Heap size related thing. in Hadoop for ex.  Namenode's Java Heap Size in bytes. Secondary namenode's Java Heap Size in bytes. Balancer's Java Heap...
   Author: Dhanasekaran Anbalagan, 2013-02-05, 17:04
Re: HDFS Block location verification - MapReduce - [mail # user]
...Hi Samir,  Thanks so much.  Exactly I want this.  tech@dvcliftonhera150:~$ hadoop fsck -locations -blocks -files /user/tech/pkg.tar.gz DEPRECATED: Use of this script to execut...
   Author: Dhanasekaran Anbalagan, 2013-02-05, 15:36
How to find Blacklisted Nodes via cli. - MapReduce - [mail # user]
...Hi Guys,  How to find Blacklisted Nodes via, command line. I want to see job Tracker Blacklisted Nodes and hdfs Blacklisted Nodes.  and also how to clear blacklisted nodes to clear...
   Author: Dhanasekaran Anbalagan, 2013-01-30, 16:05
jobTracker Blacklisted Nodes - MapReduce - [mail # user]
...Hi Guys,  Difference between Job tracker cluster level blacklisted nodes and job level blacklist node.  In my case My jobtacker page says no Blacklisted nodes, When i open job link...
   Author: Dhanasekaran Anbalagan, 2013-01-28, 12:16
Job Tracker & TaskTracker logs location Understaning - MapReduce - [mail # user]
...Hi Guys,  How to understand log location of job tracker and tasktracker logs location understanding.  In jobTacker Logs root@dvcliftonhera122:/var/log# tree -d hadoop-0.20-mapreduc...
   Author: Dhanasekaran Anbalagan, 2013-01-28, 11:56
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