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Re: Will hadoop always spread the work evenly between nodes? - HDFS - [mail # user]
...I think in your case it will have to be even, because all the slots will get filled. A more interesting case is if you have 40 nodes, will you get exactly 5 slots used for each of the nodes?...
   Author: Jeffrey Buell, 2013-03-13, 20:47
Re: Format the harddrive - HDFS - [mail # user]
...I've installed RHEL 6.1 with none of these problems. Not sure why you can't delete the logical volumes, but I suggest not letting the installer do automatic disk configuration. Then you can ...
   Author: Jeffrey Buell, 2013-02-25, 21:09
Re: config for high memory jobs does not work, please help. - HDFS - [mail # user]
...Try:  -Dmapred.tasktracker.map.tasks.maximum=1  Although I usually put this parameter in mapred-site.xml.  Jeff   Dear all,  I know it is best to use small amount of...
   Author: Jeffrey Buell, 2013-01-18, 20:23
RE: Pi Estimator failing to print output after finishing the job sucessfully - HDFS - [mail # user]
...You didn't do anything wrong, this is just a bug in the Pi application.  Th e application _should_ be able to divide two numbers and not require an exa ct decimal result.  Everythi...
   Author: Jeffrey Buell, 2012-09-04, 16:36
RE: Testing rack awareness - HDFS - [mail # user]
..."rack awareness" is a bit of a misnomer.  Hadoop is not aware of racks in t he sense that it can figure out your network topology.  Instead, you need t o write a script that tells ...
   Author: Jeffrey Buell, 2012-02-01, 22:10
[expand - 1 more] - RE: Moving disks from one datanode to another - HDFS - [mail # user]
...Each physical host has 12 disks and I run 4 VMs with 3 disks dedicated to e ach.  I happen to use Physical RDM (disks are passed through to the VMs), b ut this was done more for conveni...
   Author: Jeffrey Buell, 2011-12-07, 20:21
storage performance problem - HDFS - [mail # user]
...I'm seeing an odd storage performance problem that I hope can be fixed with  the right configuration parameter, but nothing I've tried so far helps.  T hese tests were done in a vi...
   Author: Jeffrey Buell, 2011-07-09, 02:58
RE: how does hdfs determine what node to use? - HDFS - [mail # user]
...Rita said that she has 2 racks (not 2 nodes).  Rita, how many nodes per rac k do you have?  To continue the thread, could there be a performance advantage to having gr eater replic...
   Author: Jeffrey Buell, 2011-03-10, 18:34
[expand - 2 more] - RE: balancing and replication in HDFS - HDFS - [mail # user]
...Todd,  Much better.  I also had to adjust the number of map tasks for the gen step .  Storage was spread across 3 nodes instead of 4, but a bit more playing w ith these parame...
   Author: Jeffrey Buell, 2011-02-28, 05:01
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