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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
Re: alternative to $HADOOP_HOME/lib - MapReduce - [mail # user]
...John,  I assume you do not wish to be using the DistributedCache (or a HDFS location for DistributedCache), which is the most ideal way to ship jars.  You can place your jars onto ...
   Author: Harsh J, 2013-08-09, 02:30
Re: problem about DN&NM directory design - MapReduce - [mail # user]
...This is appropriate. You are making use of both disk mounts and have the directories for each service isolated as well.  On Fri, Aug 9, 2013 at 7:37 AM, ch huang  wrote:   &nb...
   Author: Harsh J, 2013-08-09, 02:28
Re: issue about resource manager HA - MapReduce - [mail # user]
...You are partially incorrect - NameNode is not an SPOF any longer in 2.x releases. Please look at the docs that cover HA in the release you use, such as http://hadoop.apache.org/docs/current/...
   Author: Harsh J, 2013-08-09, 02:24
Re: specify Mapred tasks and slots - MapReduce - [mail # user]
...What Devaraj said. Except that if you use CapacityScheduler, then you can bind together memory requests and slot concepts, and be able to have a task grab more than one slot for itself when ...
   Author: Harsh J, 2013-08-08, 03:55
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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