You provided the answer, JNI is a solution. Another one would be to use hadoop streaming if your program can read stdin and write into stdout with a good enough format.
A MR job is, in the end, plain java and does not impact how java can call external process.


On Mon, Dec 3, 2012 at 1:05 PM, Mohammad Tariq <> wrote:
Hello list,

          I have a tool (written in C) that performs some different types of operations and can be used as a command line utility. I had to write a similar tool, as we have moved towards Hadoop platform for most of the things. 

Till now I have taken this tool as reference  and written MR jobs corresponding to some the modules of this tool and they are working fine. But I am wasting a lot of time in this. So, I just wanted to ask if it is possible to call this tool through a MR job?? Somewhat like JNI kinda thing. (I hope it is, otherwise I have to write rest of things from scratch and we are running out of time).

Many thanks.

    Mohammad Tariq

Bertrand Dechoux