private static File detectHadoopConfigurationDirectory(
File command, File temporary, Map<String, String> envp) throws IOException {
assert command != null;
assert temporary != null;
assert envp != null;
prepareClasspath(temporary, ConfigurationDetecter.class);
File resultOutput = new File(temporary, PATH_SUBPROC_OUTPUT);
List<String> arguments = new ArrayList<String>();
arguments.add(command.getAbsolutePath());
arguments.add(ConfigurationDetecter.class.getName());
arguments.add(resultOutput.getAbsolutePath());
ProcessBuilder processBuilder = new ProcessBuilder(arguments);
processBuilder.environment().clear();
processBuilder.environment().putAll(envp);
processBuilder.environment().put(ENV_HADOOP_CLASSPATH, temporary.getPath());
Process process = processBuilder.start();
try {
Thread redirectOut = redirect(process.getInputStream(), System.out);
Thread redirectErr = redirect(process.getErrorStream(), System.err);
try {
int exit = process.waitFor();
redirectOut.join();
redirectErr.join();
if (exit != 0) {
throw new IOException(
MessageFormat.format(
"Failed to execute Hadoop command (exitcode={1}): {0}",
arguments, String.valueOf(exit)));
}
} catch (InterruptedException e) {
throw (IOException)
new InterruptedIOException(
MessageFormat.format(
"Failed to execute Hadoop command (interrupted): {0}", arguments))
.initCause(e);
}
} finally {
process.destroy();
}
if (resultOutput.isFile() == false) {
throw new IOException(
MessageFormat.format("Failed to restore Hadoop configuration path: {0}", resultOutput));
}
File path = ConfigurationDetecter.read(resultOutput);
return path;
}
