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Re: Will hadoop always spread the work evenly between nodes? - HDFS - [mail # user]
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...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?...
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Author: Jeffrey Buell,
2013-03-13, 20:47
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Re: Format the harddrive - HDFS - [mail # user]
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...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 ...
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Author: Jeffrey Buell,
2013-02-25, 21:09
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Re: config for high memory jobs does not work, please help. - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2013-01-18, 20:23
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RE: Pi Estimator failing to print output after finishing the job sucessfully - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2012-09-04, 16:36
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RE: Testing rack awareness - HDFS - [mail # user]
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..."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 ...
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Author: Jeffrey Buell,
2012-02-01, 22:10
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RE: Moving disks from one datanode to another - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2011-12-07, 20:21
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RE: Moving disks from one datanode to another - HDFS - [mail # user]
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... This is the same issue as for running multiple virtual machines on each phy sical host. I've found (on 0.20.2) that this gives consistently better per formance than a single VM o...
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Author: Jeffrey Buell,
2011-12-07, 18:21
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storage performance problem - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2011-07-09, 02:58
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RE: how does hdfs determine what node to use? - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2011-03-10, 18:34
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RE: balancing and replication in HDFS - HDFS - [mail # user]
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...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...
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Author: Jeffrey Buell,
2011-02-28, 05:01
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