Big Data vs RDBMS

Two years back, i was preparing some MapReduce code to satisfy my curiosity towards algorithm and big data technologies like Apache Hadoop.
I knew this is something really required. At that time, trend for big data technologies was picking up and we started hearing about more on it. I was reading some article and facts that 90% of world total data was added in last two years, i am sure by this time it is more towards mid or late 90s.

Here is the trend of last few years of big data technologies and RDBMS. Of course, i can not compare it with Oracle or MS databases but trend is spiked up and it will continue like this.

Good time to invest in those technologies for developer like us.