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Re: desperate question about NameNode startup sequence - Hadoop - [mail # user]
...The problem with checkpoint /2nn is that it happily "runs" and has no outward indication that it is unable to connect.  Because you have a large edits file you startup will complete, ho...
   Author: Edward Capriolo, 2011-12-17, 21:00
Re: Analysing Completed Job info programmatically apart from Jobtracker GUI - Hadoop - [mail # user]
...I would check out hitune. I have a github project that connects to the JobTracker and stores counters, job times and other stats into Cassandra.  https://github.com/edwardcapriolo/hadoo...
   Author: Edward Capriolo, 2011-12-14, 17:30
Re: Matrix multiplication in Hadoop - Hadoop - [mail # user]
...Sounds like a job for next gen map reduce native libraries and gpu's. A modern day Dr frankenstein for sure.  On Saturday, November 19, 2011, Tim Broberg  wrote: in...
   Author: Edward Capriolo, 2011-11-19, 16:53
Re: pointing mapred.local.dir to a ramdisk - Hadoop - [mail # user]
...This directory can get very large, in many cases I doubt it would fit on a ram disk.  Also RAM Disks tend to help most with random read/write, since hadoop is doing mostly linear IO you...
   Author: Edward Capriolo, 2011-10-03, 17:36
Re: linux containers with Hadoop - Hadoop - [mail # user]
...On Fri, Sep 30, 2011 at 9:03 AM, bikash sharma wrote:   Previously hadoop launched map reduce tasks as a single user, now with security tasks can launch as different users in the same O...
   Author: Edward Capriolo, 2011-09-30, 17:39
Re: formatting hdfs without user interaction - Hadoop - [mail # user]
...On Fri, Sep 23, 2011 at 11:52 AM,  wrote:  You might want to try expect scripting. You open a stream to the process and then can wait for prompts and print replies. expect also has...
   Author: Edward Capriolo, 2011-09-23, 16:01
Re: Hadoop doesnt use Replication Level of Namenode - Hadoop - [mail # user]
...On Tue, Sep 13, 2011 at 5:53 AM, Steve Loughran  wrote:  Another technique is that if you are using a single replication factor on all files you can mark the property as true in th...
   Author: Edward Capriolo, 2011-09-13, 14:56
Re: do HDFS files starting with _ (underscore) have special properties? - Hadoop - [mail # user]
...On Fri, Sep 2, 2011 at 4:04 PM, Meng Mao  wrote:   Files starting with '_' are considered 'hidden' like unix files starting with '.'. I did not know that for a very long time becau...
   Author: Edward Capriolo, 2011-09-02, 21:20
Re: Help - Rack Topology Script - Hadoop 0.20 (CDH3u1) - Hadoop - [mail # user]
...On Sun, Aug 21, 2011 at 10:22 AM, Joey Echeverria  wrote:   If you run the hdfs balancer application the application displays the topology it learns from from the topology script. ...
   Author: Edward Capriolo, 2011-08-21, 23:13
Re: Why hadoop should be built on JAVA? - Hadoop - [mail # user]
...This should explain it http://jz10.java.no/java-4-ever-trailer.html .  On Tue, Aug 16, 2011 at 1:17 PM, Adi  wrote:  ...
   Author: Edward Capriolo, 2011-08-17, 01:41
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