/**
* Build the environment used for all exec calls.
*
* @return The environment variables.
*/
public Map<String, String> execEnv(Map<String, String> env) {
HashMap<String, String> res = new HashMap<String, String>();
for (String key : appConf.getStrings(AppConfig.EXEC_ENVS_NAME)) {
String val = System.getenv(key);
if (val != null) {
res.put(key, val);
}
}
if (env != null) res.putAll(env);
for (Map.Entry<String, String> envs : res.entrySet()) {
LOG.info("Env " + envs.getKey() + "=" + envs.getValue());
}
return res;
}
private ExecServiceImpl() {
avail = new Semaphore(appConf.getInt(AppConfig.EXEC_MAX_PROCS_NAME, 16));
}
private ExecBean auxRun(String program, List<String> args, Map<String, String> env)
throws NotAuthorizedException, ExecuteException, IOException {
DefaultExecutor executor = new DefaultExecutor();
executor.setExitValues(null);
// Setup stdout and stderr
int nbytes = appConf.getInt(AppConfig.EXEC_MAX_BYTES_NAME, -1);
ByteArrayOutputStream outStream = new MaxByteArrayOutputStream(nbytes);
ByteArrayOutputStream errStream = new MaxByteArrayOutputStream(nbytes);
executor.setStreamHandler(new PumpStreamHandler(outStream, errStream));
// Only run for N milliseconds
int timeout = appConf.getInt(AppConfig.EXEC_TIMEOUT_NAME, 0);
ExecuteWatchdog watchdog = new ExecuteWatchdog(timeout);
executor.setWatchdog(watchdog);
CommandLine cmd = makeCommandLine(program, args);
LOG.info("Running: " + cmd);
ExecBean res = new ExecBean();
if (Shell.WINDOWS) {
// The default executor is sometimes causing failure on windows. hcat
// command sometimes returns non zero exit status with it. It seems
// to hit some race conditions on windows.
env = execEnv(env);
String[] envVals = new String[env.size()];
int i = 0;
for (Entry<String, String> kv : env.entrySet()) {
envVals[i++] = kv.getKey() + "=" + kv.getValue();
LOG.info("Setting " + kv.getKey() + "=" + kv.getValue());
}
Process proc;
synchronized (WindowsProcessLaunchLock) {
// To workaround the race condition issue with child processes
// inheriting unintended handles during process launch that can
// lead to hangs on reading output and error streams, we
// serialize process creation. More info available at:
// http://support.microsoft.com/kb/315939
proc = Runtime.getRuntime().exec(cmd.toStrings(), envVals);
}
// consume stderr
StreamOutputWriter errorGobbler =
new StreamOutputWriter(proc.getErrorStream(), "ERROR", errStream);
// consume stdout
StreamOutputWriter outputGobbler =
new StreamOutputWriter(proc.getInputStream(), "OUTPUT", outStream);
// start collecting input streams
errorGobbler.start();
outputGobbler.start();
// execute
try {
res.exitcode = proc.waitFor();
} catch (InterruptedException e) {
throw new IOException(e);
}
// flush
errorGobbler.out.flush();
outputGobbler.out.flush();
} else {
res.exitcode = executor.execute(cmd, execEnv(env));
}
String enc = appConf.get(AppConfig.EXEC_ENCODING_NAME);
res.stdout = outStream.toString(enc);
res.stderr = errStream.toString(enc);
try {
watchdog.checkException();
} catch (Exception ex) {
LOG.error("Command: " + cmd + " failed. res=" + res, ex);
}
if (watchdog.killedProcess()) {
String msg =
" was terminated due to timeout("
+ timeout
+ "ms). See "
+ AppConfig.EXEC_TIMEOUT_NAME
+ " property";
LOG.warn("Command: " + cmd + msg + " res=" + res);
res.stderr += " Command " + msg;
}
if (res.exitcode != 0) {
LOG.info("Command: " + cmd + " failed. res=" + res);
}
return res;
}