在Java程序中执行Pig命令

Question

I used to write PHP code to execute pig command, it worked well, Now I switch to Java but seems it won't work, here is my code:

String pigCommand = "pig -x local -p ouput=/tmp my_pig_script.pig";

Runtime r = Runtime.getRuntime();
Process p;
int exitVal;

try {
    p = r.exec(pigCommand);
    exitVal = p.waitFor();
    BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String line = null;

    while((line = br.readLine()) != null) {
        System.out.println(line);
    }
    br.close();

    System.out.println("exitVal: " + exitVal);
    System.out.println("Done");

If I run the that pig command in console directly, it works, if I replace that Pig command with other shell command say 'ping www.yahoo.com', and run the java Program, it works too. So what might be the problem? thanks

Answer 1

You should use PigServer to execute pig scripts from java programs. It is more foolproof and more portable.

Also see this answer: https://stackoverflow.com/a/11299259/373151