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RE: HDFS data and non-aligned splits - MapReduce - [mail # user]
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...Related to this, I see in the elephant book under "Which compression format should I use": "Use a container file format such as Sequence File..." Does Sequence File attempt to align compress...
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Author: John Lilley,
2013-05-23, 17:59
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HDFS data and non-aligned splits - MapReduce - [mail # user]
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...What happens when MR produces data splits, and those splits don't align on block boundaries? I've read that MR will attempt to make data splits near block boundaries to improve data lo...
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Author: John Lilley,
2013-05-23, 17:53
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Re: Hadoop Installation Mappers setting - MapReduce - [mail # user]
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...I am explaining it more. If your machine have 8 GB of memory. After reserving to Operating system and all other processes except tasktracker, you have 4 GB remaining(assume). The remaining p...
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Author: Amal G Jose,
2013-05-23, 17:33
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splittable vs seekable compressed formats - MapReduce - [mail # user]
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...I've read about splittable compressed formats in Hadoop. Are any of these formats also "seekable" (in other words, be able to seek to an absolute location in the uncompressed data). Jo...
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Author: John Lilley,
2013-05-23, 17:31
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Re: Is there a way to limit # of hadoop tasks per user at runtime? - MapReduce - [mail # user]
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...You can use capacity scheduler also. In that you can create some queues, each of specific capacity. Then you can submit jobs to that specific queue at runtime or you can configure it as dire...
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Author: Amal G Jose,
2013-05-23, 17:25
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Re: Out of memory error by Node Manager, and shut down - MapReduce - [mail # user]
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...Looks like the problem is with jvm heap size. Its trying to create a new thread and threads require native memory for internal JVM related things. One of the possible solution is to re...
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Author: Pramod N,
2013-05-23, 16:05
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Re: Hadoop Rack awareness on virtual system - MapReduce - [mail # user]
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...An example topology file and script is available on the Wiki at http://wiki.apache.org/hadoop/topology_rack_awareness_scripts On Thu, May 23, 2013 at 8:38 PM, Jitendra Yadav wrote: &n...
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Author: Harsh J,
2013-05-23, 15:30
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Re: Hadoop Rack awareness on virtual system - MapReduce - [mail # user]
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...Hi Leonid, Thanks for you reply. please you please give me an example how to make topology.sh file? Lets say I have below slave servers(data nodes) 192.168.45.1 ...
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Author: Jitendra Yadav,
2013-05-23, 15:08
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[MAPREDUCE-5233] Functions are changed or removed from Job in jobcontrol - MapReduce - [issue]
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...The functions are removed from Job in jobcontrol:1. setMapredJobID(String)2. setState(int)The function signatures are changed:1. addDependingJob(ControlledJob)2. getMapredJobID()...
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http://issues.apache.org/jira/browse/MAPREDUCE-5233
Author: Zhijie Shen,
2013-05-23, 15:06
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Hadoop Classpath issue. - MapReduce - [mail # user]
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...Hi Guys, When i trying to execute hadoop fs -ls / command It's return extra two lines. 226:~# hadoop fs -ls / *common ./* *lib lib* Found 9 items drwxrwxrwx - hdfs ...
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Author: Dhanasekaran Anbalagan,
2013-05-23, 14:44
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