/**
* Executes launcher.
*
* @param configuration the Hadoop configuration for the application
* @param args the launcher arguments
* @return the exit status
*/
public static int exec(Configuration configuration, String... args) {
if (LOG.isDebugEnabled()) {
LOG.debug(
MessageFormat.format(
"Preparing application: {0}", //$NON-NLS-1$
Arrays.toString(args)));
}
configuration.setBoolean(KEY_LAUNCHER_USED, true);
LauncherOptions options;
try {
options = LauncherOptionsParser.parse(configuration, args);
} catch (Exception e) {
LOG.error(
MessageFormat.format("Exception occurred in launcher: {0}", Arrays.toString(args)), e);
return LAUNCH_ERROR;
}
try {
Configuration conf = options.getConfiguration();
conf.setClassLoader(options.getApplicationClassLoader());
Tool tool;
try {
tool = ReflectionUtils.newInstance(options.getApplicationClass(), conf);
} catch (Exception e) {
LOG.error(
MessageFormat.format(
"Exception occurred in launcher: {0}{1}",
options.getApplicationClass().getName(), options.getApplicationArguments()),
e);
return LAUNCH_ERROR;
}
try {
return launch(conf, tool, options.getApplicationArgumentArray());
} catch (Exception e) {
LOG.error(
MessageFormat.format(
"Exception occurred in launcher: {0}{1}",
options.getApplicationClass().getName(), options.getApplicationArguments()),
e);
return CLIENT_ERROR;
}
} finally {
disposeClassLoader(options.getApplicationClassLoader());
for (File file : options.getApplicationCacheDirectories()) {
if (delete(file) == false) {
LOG.warn(
MessageFormat.format("Failed to delete the application cache directory: {0}", file));
}
}
}
}
