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brain of mat kelcey

e10.0 introducing tgraph

September 19, 2009 at 02:41 PM | categories: big data, e10, twitter, hadoop, pig, algorithms | View Comments

so e9 sip is on hold for a bit while i kick off e10 tgraph. was looking for another problem to try hadoop with and came across a classic graph one, pagerank. a well understood algorithm like page rank will be a  great chance to try pig, the query language that sits on top of hadoop we need a graph to work on. my first thoughts were using one of the wikipedia linkage dumps but it feels a bit sterile. instead it's a good excuse to do a little crawl of the following graph of twitter.this will also be...
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first hadoop experiment

September 16, 2009 at 07:26 PM | categories: ec2, big data, hadoop | View Comments

just finished my first hadoop fantastic results but heaps of of feedback from hadoop mailing groupmore results coming soon...
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how using compressed data can make you app faster

June 28, 2009 at 11:32 AM | categories: gzip, big data, sys admin | View Comments

when working with larger data sets (ie more than can fit in memory) there are two important resources to juggle…cpu. how quickly can you process the data.disk io. how quickly can you get data to the cpu.i remember reading once that depending on your situation you might be better off using data compressed on disk. why? because the extra cpu time used decompressing it is worth it for the time saved getting it off disk.i’ve recently been working with a number crunching app (burns 100% cpu of a quadcore machine for an hour over a 7gb working dataset) and thought...
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old projects...