@Override
public final void run() {
String errorInfo = "Child Error";
try {
// before preparing the job localize
// all the archives
TaskAttemptID taskid = t.getTaskID();
final LocalDirAllocator lDirAlloc = new LocalDirAllocator("mapred.local.dir");
// simply get the location of the workDir and pass it to the child. The
// child will do the actual dir creation
final File workDir =
new File(
new Path(
localdirs[rand.nextInt(localdirs.length)],
TaskTracker.getTaskWorkDir(
t.getUser(),
taskid.getJobID().toString(),
taskid.toString(),
t.isTaskCleanupTask()))
.toString());
// Set up the child task's configuration. After this call, no localization
// of files should happen in the TaskTracker's process space. Any changes to
// the conf object after this will NOT be reflected to the child.
// setupChildTaskConfiguration(lDirAlloc);
if (!prepare()) {
return;
}
// Accumulates class paths for child.
List<String> classPaths = getClassPaths(conf, workDir, taskDistributedCacheManager);
long logSize = TaskLog.getTaskLogLength(conf);
// Build exec child JVM args.
Vector<String> vargs = getVMArgs(taskid, workDir, classPaths, logSize);
tracker.addToMemoryManager(t.getTaskID(), t.isMapTask(), conf);
// set memory limit using ulimit if feasible and necessary ...
String setup = getVMSetupCmd();
// Set up the redirection of the task's stdout and stderr streams
File[] logFiles = prepareLogFiles(taskid, t.isTaskCleanupTask());
File stdout = logFiles[0];
File stderr = logFiles[1];
tracker.getTaskTrackerInstrumentation().reportTaskLaunch(taskid, stdout, stderr);
Map<String, String> env = new HashMap<String, String>();
errorInfo = getVMEnvironment(errorInfo, workDir, conf, env, taskid, logSize);
// flatten the env as a set of export commands
List<String> setupCmds = new ArrayList<String>();
appendEnvExports(setupCmds, env);
setupCmds.add(setup);
launchJvmAndWait(setupCmds, vargs, stdout, stderr, logSize, workDir);
tracker.getTaskTrackerInstrumentation().reportTaskEnd(t.getTaskID());
if (exitCodeSet) {
if (!killed && exitCode != 0) {
if (exitCode == 65) {
tracker.getTaskTrackerInstrumentation().taskFailedPing(t.getTaskID());
}
throw new IOException("Task process exit with nonzero status of " + exitCode + ".");
}
}
} catch (FSError e) {
LOG.fatal("FSError", e);
try {
tracker.internalFsError(t.getTaskID(), e.getMessage());
} catch (IOException ie) {
LOG.fatal(t.getTaskID() + " reporting FSError", ie);
}
} catch (Throwable throwable) {
LOG.warn(t.getTaskID() + " : " + errorInfo, throwable);
Throwable causeThrowable = new Throwable(errorInfo, throwable);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
causeThrowable.printStackTrace(new PrintStream(baos));
try {
tracker.internalReportDiagnosticInfo(t.getTaskID(), baos.toString());
} catch (IOException e) {
LOG.warn(t.getTaskID() + " Reporting Diagnostics", e);
}
} finally {
// It is safe to call TaskTracker.TaskInProgress.reportTaskFinished with
// *false* since the task has either
// a) SUCCEEDED - which means commit has been done
// b) FAILED - which means we do not need to commit
tip.reportTaskFinished(false);
}
}
@Override
public final void run() {
String errorInfo = "Child Error";
try {
// before preparing the job localize
// all the archives
TaskAttemptID taskid = t.getTaskID();
final LocalDirAllocator lDirAlloc = new LocalDirAllocator("mapred.local.dir");
final File workDir = formWorkDir(lDirAlloc, taskid, t.isTaskCleanupTask(), conf);
// We don't create any symlinks yet, so presence/absence of workDir
// actually on the file system doesn't matter.
tip.getUGI()
.doAs(
new PrivilegedExceptionAction<Void>() {
public Void run() throws IOException {
taskDistributedCacheManager =
tracker
.getTrackerDistributedCacheManager()
.newTaskDistributedCacheManager(conf);
taskDistributedCacheManager.setup(
lDirAlloc,
workDir,
TaskTracker.getPrivateDistributedCacheDir(conf.getUser()),
TaskTracker.getPublicDistributedCacheDir());
return null;
}
});
// Set up the child task's configuration. After this call, no localization
// of files should happen in the TaskTracker's process space. Any changes to
// the conf object after this will NOT be reflected to the child.
setupChildTaskConfiguration(lDirAlloc);
if (!prepare()) {
return;
}
// Accumulates class paths for child.
List<String> classPaths = getClassPaths(conf, workDir, taskDistributedCacheManager);
long logSize = TaskLog.getTaskLogLength(conf);
// Build exec child JVM args.
Vector<String> vargs = getVMArgs(taskid, workDir, classPaths, logSize);
tracker.addToMemoryManager(t.getTaskID(), t.isMapTask(), conf);
// set memory limit using ulimit if feasible and necessary ...
List<String> setup = getVMSetupCmd();
// Set up the redirection of the task's stdout and stderr streams
File[] logFiles = prepareLogFiles(taskid, t.isTaskCleanupTask());
File stdout = logFiles[0];
File stderr = logFiles[1];
List<TaskTrackerInstrumentation> ttInstrumentations =
tracker.getTaskTrackerInstrumentations();
for (TaskTrackerInstrumentation inst : ttInstrumentations) {
inst.reportTaskLaunch(taskid, stdout, stderr);
}
Map<String, String> env = new HashMap<String, String>();
errorInfo = getVMEnvironment(errorInfo, workDir, conf, env, taskid, logSize);
launchJvmAndWait(setup, vargs, stdout, stderr, logSize, workDir, env);
for (TaskTrackerInstrumentation inst : ttInstrumentations) {
inst.reportTaskEnd(t.getTaskID());
}
if (exitCodeSet) {
if (!killed && exitCode != 0) {
if (exitCode == 65) {
for (TaskTrackerInstrumentation inst : ttInstrumentations) {
inst.taskFailedPing(t.getTaskID());
}
}
throw new IOException("Task process exit with nonzero status of " + exitCode + ".");
}
}
} catch (FSError e) {
LOG.fatal("FSError", e);
try {
tracker.internalFsError(t.getTaskID(), e.getMessage());
} catch (IOException ie) {
LOG.fatal(t.getTaskID() + " reporting FSError", ie);
}
} catch (Throwable throwable) {
LOG.warn(t.getTaskID() + " : " + errorInfo, throwable);
Throwable causeThrowable = new Throwable(errorInfo, throwable);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
causeThrowable.printStackTrace(new PrintStream(baos));
try {
tracker.internalReportDiagnosticInfo(t.getTaskID(), baos.toString());
} catch (IOException e) {
LOG.warn(t.getTaskID() + " Reporting Diagnostics", e);
}
} finally {
try {
if (taskDistributedCacheManager != null) {
taskDistributedCacheManager.release();
}
} catch (IOException ie) {
LOG.warn("Error releasing caches : Cache files might not have been cleaned up");
}
// It is safe to call TaskTracker.TaskInProgress.reportTaskFinished with
// *false* since the task has either
// a) SUCCEEDED - which means commit has been done
// b) FAILED - which means we do not need to commit
tip.reportTaskFinished(false);
}
}
