Example usage for org.apache.hadoop.util Shell execCommand

Introduction

In this page you can find the example usage for org.apache.hadoop.util Shell execCommand.

Prototype

public static String execCommand(Map<String, String> env, String... cmd) throws IOException 

Source Link

Document

Static method to execute a shell command.

Usage

From source file:cn.edu.buaa.act.petuumOnYarn.ApplicationMaster.java

License:Apache License

/**
 * Dump out contents of $CWD and the environment to stdout for debugging
 *//*from w ww .j ava 2  s.  c o  m*/
private void dumpOutDebugInfo() {

    LOG.info("Dump debug output");
    Map<String, String> envs = System.getenv();
    for (Map.Entry<String, String> env : envs.entrySet()) {
        LOG.info("System env: key=" + env.getKey() + ", val=" + env.getValue());
        System.out.println("System env: key=" + env.getKey() + ", val=" + env.getValue());
    }

    BufferedReader buf = null;
    try {
        String lines = Shell.execCommand("ls", "-al");
        buf = new BufferedReader(new StringReader(lines));
        String line = "";
        while ((line = buf.readLine()) != null) {
            LOG.info("System CWD content: " + line);
            System.out.println("System CWD content: " + line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        IOUtils.cleanup(LOG, buf);
    }
}

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