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Saturday, January 31, 2015

How to setup software raid mirroring for disks on xubuntu

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Over a course period of time, disk stop working in a computer is to be expected and if it does, then all the data is lost. Oh no, that's...
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Friday, January 30, 2015

Initial study to docker

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Docker making so much fuss lately and today we are going to look into Docker. Let's start something basic, what actually is a docker? A...
Sunday, January 18, 2015

how to improve apache cassandra 1.0.8 read speed

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This article is for improve reading speed for apache cassandra 1.0.8 . Because the reading improvement determined by many factors, we will i...
Saturday, January 17, 2015

Investigate into Apache Cassandra Memtable updateLiveRatio logging output

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Today, we are going to study apache cassandra 1.0.8 on memtable logging its statistics in the cassandra system.log. Example below WARN [Me...
Friday, January 16, 2015

operate casandra using jmx in terminal including changing pool size, compacting sstables and key cache

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If you operate apache cassandra cluster and if load per node goes huge (like nodetool info show 800GB) , compactions become a problem. It...
Sunday, January 4, 2015

Embed video into debian mediawiki

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Today, this article is a bit special and a short one, we will configured something interesting. We will embed video into mediawiki in debia...
Saturday, January 3, 2015

apache cassandra 1.0.8 IncompatibleClassChangeError vtable stub and AssertionError Added column does not sort as the last column

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Today we will spend sometime to look into two errors and see if it is really something to concern about. The erros are thrown when apache ca...