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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
Re: executing linux command from hadoop (python) - MapReduce - [mail # user]
...Yes it would work with streaming, but note that if your os.system(…) call produces any stdout prints, they are treated as task output and are sent to HDFS/Reducers.  P.s. I assume the e...
   Author: Harsh J, 2013-08-16, 03:33
Re: when Standby Namenode is doing checkpoint, the Active NameNode is slow. - MapReduce - [mail # user]
...How large are your checkpointed fsimage files?  On Mon, Aug 12, 2013 at 3:42 PM, lei liu  wrote:    Harsh J...
   Author: Harsh J, 2013-08-13, 03:05
[expand - 1 more] - Re: the options that used to tuning mapreduceV1 is still useful for YARN? - MapReduce - [mail # user]
...Hi,  You can view them at http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/DeprecatedProperties.html for 2.x.  On Mon, Aug 12, 2013 at 8:28 AM, ch huang &nbs...
   Author: Harsh J, 2013-08-12, 05:06
[expand - 1 more] - Re: How to compress MapFile programmatically - MapReduce - [mail # user]
...A MapFile.Reader will automatically detect and decompress without needing to be told anything special. You needn't have to worry about decompressing files by yourself in Apache Hadoop genera...
   Author: Harsh J, 2013-08-11, 15:22
[expand - 1 more] - Re: Why LineRecordWriter.write(..) is synchronized - MapReduce - [mail # user]
...Yes, I feel we could discuss this over a JIRA to remove it if it hurts perf. too much, but it would have to be a marked incompatible change, and we have to add a note about the lack of threa...
   Author: Harsh J, 2013-08-11, 12:59
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