Which device is famous for tweeting in Korea

I was wondering how many people use android to tweet and how many use iphone, so I did little bit a research on this,
Fortunately, there is a "source" field in raw json tweet data, so I grouped tweets by that field for random day.

hive> select source, count(*) as cnt from twitter where datehour>=2014052000 and datehour<=2014052023 group by source order by cnt desc;

Result:

Android	593671
Web	204334
Twittbot.net	153035
iPhone	144256
Tweetdeck	65767
iPad	19933

Note that the tweets are for May 20 including only the ones with korean syllables

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NLP for Uzbek language

Natural language processing is an essential tool for text mining in data analysis field. In this post, I want to share my approach in developing stemmer for Uzbek language. Uzbek language is spoken by 27 million people around the world and there are a lot of textual materials in internet in uzbek language and it is growing. As I was doing my weekend project " FlipUz " (which is news aggregator for Uzbek news sites) I stumbled on a problem of automatic tagging news into different categories. As this requires a good NLP library, I was not able to find one for Uzbek language. That is how I got a motive to develop a stemmer for Uzbek language. In short, Stemming is an algorithm to remove meaningless suffixes at the end, thus showing the core part of the word. For example: rabbits -> rabbit. As Uzbek language is similar to Turkish, I was curious if there is stemmer for Turkish. And I found this: Turkish Stemmer with Snowball. Their key approach was to u

Three essential things to do while building Hadoop environment

Last year I setup Hadoop environment by using Cloudera manager. (Basically I followed this video tutorial : http://www.youtube.com/watch?v=CobVqNMiqww ) I used CDH4(cloudera hadoop) that included HDFS, MapReduce, Hive, ZooKeeper HBase, Flume and other essential components. It also included YARN (MapReduce 2) but it was not stable so I used MapReduce instead. I installed CDH4 on 10 centos nodes, and I set the Flume to collect twitter data, and by using "crontab" I scheduled the indexing the twitter data in Hive. Anyways, I want to share some of my experiences and challenges that I faced. First, let me give some problem solutions that everyone must had faced while using Hadoop. 1. vm.swappiness warning on hadoop nodes It is easy to get rid of this warning by just simply running this shell command on nodes: >sysctl -w vm.swappiness=0 More details are written on cloudera's site 2. Make sure to synchronize time on all nodes (otherwise it will give error on n

NAT Traversal or how to make P2P on Android

Many of us used BitTorrent(or uTorrent) to download files on internet in a short time. Their download speed is high due to Peer-to-peer technology. That means, rather than downloading file from server, we are getting the file from another computer. But how two computers that have a local IP and are behind NAT, how they can connect each other? For that, NAT Traversal methodologies come for help. Note that there are mainly 2 types of NAT: Symmetrical(complex NATs:carrier-grade NAT) and Full (home network or small enterprises). let us consider Full NATs first. Methodologies of NAT traversal are: UPnP - old and hardware oriented method NAT-PMP (later succeeded by PCP)- introduced by Apple, also hardware oriented(i.e: not all routers have it, and even if it had, it is turned off by default) UDP Punching - this is done by STUN which uses public server to discover NAT public IP & port TCP Punching - similar to UDP punching but more complicated Symmetrical NATs are a big is

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