@Override
public void truncateLogsAsUser(String user, List<Task> allAttempts) throws IOException {
Task firstTask = allAttempts.get(0);
String taskid = firstTask.getTaskID().toString();
LocalDirAllocator ldirAlloc = new LocalDirAllocator(JobConf.MAPRED_LOCAL_DIR_PROPERTY);
String taskRanFile = TaskTracker.TT_LOG_TMP_DIR + Path.SEPARATOR + taskid;
Configuration conf = getConf();
// write the serialized task information to a file to pass to the truncater
Path taskRanFilePath = ldirAlloc.getLocalPathForWrite(taskRanFile, conf);
LocalFileSystem lfs = FileSystem.getLocal(conf);
FSDataOutputStream out = lfs.create(taskRanFilePath);
out.writeInt(allAttempts.size());
for (Task t : allAttempts) {
out.writeBoolean(t.isMapTask());
t.write(out);
}
out.close();
lfs.setPermission(taskRanFilePath, FsPermission.createImmutable((short) 0755));
List<String> command = new ArrayList<String>();
File jvm = // use same jvm as parent
new File(new File(System.getProperty("java.home"), "bin"), "java");
command.add(jvm.toString());
command.add("-Djava.library.path=" + System.getProperty("java.library.path"));
command.add("-Dhadoop.log.dir=" + TaskLog.getBaseLogDir());
command.add("-Dhadoop.root.logger=INFO,console");
command.add("-classpath");
command.add(System.getProperty("java.class.path"));
// main of TaskLogsTruncater
command.add(TaskLogsTruncater.class.getName());
command.add(taskRanFilePath.toString());
String[] taskControllerCmd = new String[4 + command.size()];
taskControllerCmd[0] = taskControllerExe;
taskControllerCmd[1] = user;
taskControllerCmd[2] = localStorage.getDirsString();
taskControllerCmd[3] = Integer.toString(Commands.RUN_COMMAND_AS_USER.getValue());
int i = 4;
for (String cmdArg : command) {
taskControllerCmd[i++] = cmdArg;
}
if (LOG.isDebugEnabled()) {
for (String cmd : taskControllerCmd) {
LOG.debug("taskctrl command = " + cmd);
}
}
ShellCommandExecutor shExec = new ShellCommandExecutor(taskControllerCmd);
try {
shExec.execute();
} catch (Exception e) {
LOG.warn(
"Exit code from "
+ taskControllerExe.toString()
+ " is : "
+ shExec.getExitCode()
+ " for truncateLogs");
LOG.warn(
"Exception thrown by "
+ taskControllerExe.toString()
+ " : "
+ StringUtils.stringifyException(e));
LOG.info("Output from LinuxTaskController's " + taskControllerExe.toString() + " follows:");
logOutput(shExec.getOutput());
lfs.delete(taskRanFilePath, false);
throw new IOException(e);
}
lfs.delete(taskRanFilePath, false);
if (LOG.isDebugEnabled()) {
LOG.info("Output from LinuxTaskController's " + taskControllerExe.toString() + " follows:");
logOutput(shExec.getOutput());
}
}
