Tech Notes

Your project can be on or off. Your project's priority can be changed. Your job can be changed. But the technology is always heading north!

Wednesday, June 10, 2015

Skip Hadoop mapper when condition is satisfied

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If conf is an instance of JobConf: conf.setMapRunnerClass(MyMapRunner.class); A sample of your MyMapRunner,  public class FindAn...
Tuesday, February 3, 2015

Awesome solutions for some super good problems in Cryptograph

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http://webstersprodigy.net/tag/aes/ Just some quotations from above website: One of the biggest reasons I think the class was so good wa...
Monday, December 15, 2014

Simple Java Book

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http://www.programcreek.com/wp-content/uploads/2013/01/SimpleJava1.pdf
Saturday, November 8, 2014

IndexMinPQ

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Index minimal priority queue combine the beauty of priority queue and functionality from array. It is a priority queue sorted by Key (Key ...
Monday, October 20, 2014

Yet the best explanation for Kerberos

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http://windowsitpro.com/security/kerberos-active-directory
Saturday, October 18, 2014

Find a duplicate in array

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Given an array of N elements in which each element is an integer between 1 and N-1, write an algorithm to find any duplicate. Your algorith...
Wednesday, October 15, 2014

Add Kerberos to Hadoop

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Environment: CentOS 6.5; HW 1.3; Install Kerberos: yum install krb5-server krb5-libs krb5-auth-dialog krb5-workstation Intialize KDC: ...
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