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Re: NameNode per-block memory usage? - Hadoop - [mail # user]
...On Tue, Jan 17, 2012 at 10:08 AM, Otis Gospodnetic  wrote:   Some real world statistics. From NN web Interface. replication factor=2  Cluster Summary 22,061,605 files and dire...
   Author: Edward Capriolo, 2012-01-17, 15:22
Re: hadoop filesystem cache - Hadoop - [mail # user]
...The challenges of this design is people accessing the same data over and over again is the uncommon usecase for hadoop. Hadoop's bread and butter is all about streaming through large dataset...
   Author: Edward Capriolo, 2012-01-16, 18:07
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
[expand - 1 more] - 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
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