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Re: Checking Which Filesystem Being Used? - Hadoop - [mail # user]
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...On Tue, Feb 7, 2012 at 5:24 PM, Eli Finkelshteyn wrote: conf.get("fs.default.name") would return a URI such as hdfs://bla:8000 or file:///this. Although an application could hav...
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Author: Edward Capriolo,
2012-02-07, 22:42
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Re: jobtracker url(Critical) - Hadoop - [mail # user]
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...Task tracker sometimes so not clean up their mapred temp directories well if that is the case the tt on startup can spent many minutes deleting files. I use find to delete files older then a...
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Author: Edward Capriolo,
2012-01-27, 13:06
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Re: NameNode per-block memory usage? - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2012-01-17, 15:22
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Re: hadoop filesystem cache - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2012-01-16, 18:07
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Re: desperate question about NameNode startup sequence - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2011-12-17, 21:00
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Re: Analysing Completed Job info programmatically apart from Jobtracker GUI - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2011-12-14, 17:30
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Re: Matrix multiplication in Hadoop - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2011-11-19, 16:53
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Re: Matrix multiplication in Hadoop - Hadoop - [mail # user]
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...A problem with matrix multiplication in hadoop is that hadoop is row oriented for the most part. I have thought about this use case however and you can theoretically turn a 2D matrix into a ...
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Author: Edward Capriolo,
2011-11-18, 19:46
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Re: pointing mapred.local.dir to a ramdisk - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2011-10-03, 17:36
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Re: linux containers with Hadoop - Hadoop - [mail # user]
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...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...
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Author: Edward Capriolo,
2011-09-30, 17:39
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