Apache Spark is a fast and general engine for large-scale data processing.
100 times faster than Hadoop.
Everyone knows SQL. But traditional databases are not good in hadling big amount of data. Nevertheless, SQL is a good DSL for data processing and it is much easier to understand Spark if you have similar query implemented in SQL.
This article shows how common SQL queries implemented in Spark.Read on →
Emacs org-mode use cases, for non-programmers.Read on →
Let's celebrate Pi day in clojure!Read on →
Pouring a bit light on
SecurityManager and its use cases.
Read on →
What is the first term in the Fibonacci sequence to contain 1000 digits?
Permalink: https://projecteuler.net/problem=25Read on →
A permutation is an ordered arrangement of objects. For example, 3124 is one possible permutation of the digits 1, 2, 3 and 4. If all of the permutations are listed numerically or alphabetically, we call it lexicographic order. The lexicographic permutations of 0, 1 and 2 are:
012 021 102 120 201 210
What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?
Permalink: http://projecteuler.net/problem=24Read on →
Recently, I've re-read awesome java book Effective Java by Joshua Bloch. The book contains 78 independent items, discussing various aspects of programming in java. Something like mini-design patterns with emphasis on their pros and cons.
Few notes from each item as a refresher.Read on →
Programming Sucks.Read on →
Clojure is a great language, and as every language, it has some unobvious and strange things, which seem confusing.
Some of such things are gathered here. Most of them encountered by stupidity, docs misunderstanding, clojure specifics and procrastination.Read on →