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Re: running map tasks in remote node - MapReduce - [mail # user]
...In a multi-node mode, MR requires a distributed filesystem (such as HDFS) to be able to run.  On Sun, Aug 25, 2013 at 7:59 PM, rab ra  wrote:    Harsh J...
   Author: Harsh J, 2013-08-25, 15:06
Re: Pig upgrade - MapReduce - [mail # user]
...Sorry but that's no excuse to mailing the wrong list. You did get a response however, if you care to check: http://search-hadoop.com/m/XkQIy1PuPlh2&subj=Re+Pig+upgrade  On Sat, Aug 24, ...
   Author: Harsh J, 2013-08-24, 15:33
Re: Passing parameters to MapReduce through Oozie - MapReduce - [mail # user]
...If you use mapreduce-action, then is the configuration lookup done within a Mapper/Reducer? If so, how are you grabbing the configuration object? Via the overridden "configure(JobConf conf)"...
   Author: Harsh J, 2013-08-24, 00:54
Re: Hadoop upgrade - MapReduce - [mail # user]
...Hi,  On Fri, Aug 23, 2013 at 10:05 PM, Viswanathan J  wrote:  Yes, an upgrade won't affect those.   Yes.   Not sure what you mean, but there shouldn't be a problem a...
   Author: Harsh J, 2013-08-23, 16:41
Re: Partitioner vs GroupComparator - MapReduce - [mail # user]
...The partitioner runs on the map-end. It assigns a partition ID (reducer ID) to each key. The grouping comparator runs on the reduce-end. It helps reducers, which read off a merge-sorted sing...
   Author: Harsh J, 2013-08-23, 16:05
Re: start JN error java.net.UnknownHostException - MapReduce - [mail # user]
...Your local hostname (/etc/hostname, /etc/sysconfig/network, etc.) is using a short name, "CHBM220", which isn't understood by the DNS or by /etc/hosts. Therefore, the UnknownHostException. C...
   Author: Harsh J, 2013-08-21, 05:39
Re: Method Calls - MapReduce - [mail # user]
...For the MR2 YARN app, a nice diagram of all relevant protocol calls can be found at http://blog.cloudera.com/blog/2012/02/mapreduce-2-0-in-hadoop-0-23/   On Wed, Aug 21, 2013 at 3:28 AM...
   Author: Harsh J, 2013-08-21, 02:51
Re: produce a large sequencefile (1TB) - MapReduce - [mail # user]
...Unfortunately given the way Reducers work today you wouldn't be able to do this. They are designed to fetch all data before the merge, sort and process it through the reducer implementation....
   Author: Harsh J, 2013-08-20, 05:38
Re: YARN Container JVMs - MapReduce - [mail # user]
...If you use MR, then the options you mention are valid for controlling the MRv2 app spawned task JVMs.  If you're not seeing any JVMs being spawned across the cluster when you run an MRv...
   Author: Harsh J, 2013-08-20, 05:34
Re: " No FileSystem for scheme: hdfs " in namenode HA - MapReduce - [mail # user]
...You require hadoop-hdfs dependency for HDFS FS to get initialized. Your issue lies in how you're running the application, not your code. If you use Maven, include "hadoop-client" dependency ...
   Author: Harsh J, 2013-08-16, 09:37
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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