Most of the Hadoop uses includes processing of large data. But in real time
applications , the data provided by user will be relatively small ,in which
its not advised to use Hadoop
On Tue, Feb 1, 2011 at 10:01 PM, Black, Michael (IS) <michael.bla...@ngc.com
> wrote:
> Try this rather small C++ program...it will more than likley be a LOT
> faster than anything you could do in hadoop. Hadoop is not the hammer for
> every nail. Too many people think that any "cluster" solution will
> automagically scale their problem...tain't true.
>
> I'd appreciate hearing your results with this.
>
> #include <iostream>
> #include <fstream>
> #include <string>
>
> using namespace std;
>
> int main(int argc, char *argv[])
> {
> if (argc < 2) {
> cerr << "Usage: " << argv[0] << " [filename]" << endl;
> return -1;
> }
> ifstream in(argv[1]);
> if (!in) {
> perror(argv[1]);
> return -1;
> }
> string str;
> in >> str;
> int n=0;
> while(!in.eof()) {
> ++n;
> //cout << str << endl;
> in >> str;
> }
> in.close();
> cout << n << " words" << endl;
> return 0;
> }
>
> Michael D. Black
> Senior Scientist
> NG Information Systems
> Advanced Analytics Directorate
>
>
>
> ________________________________________
> From: Igor Bubkin [igb...@gmail.com]
> Sent: Tuesday, February 01, 2011 2:19 AM
> To: common-iss...@hadoop.apache.org
> Cc: common-user@hadoop.apache.org
> Subject: EXTERNAL:How to speed up of Map/Reduce job?
>
> Hello everybody
>
> I have a problem. I installed Hadoop on 2-nodes cluster and run Wordcount
> example. It takes about 20 sec for processing of 1,5MB text file. We want
> to
> use Map/Reduce in real time (interactive: by user's requests). User can't
> wait for his request 20 sec. This is too long. Is it possible to reduce
> time
> of Map/Reduce job? Or may be I misunderstand something?
>
> BR,
> Igor Babkin, Mifors.com
