public override void Run()
{
try
{
TaskAttemptID reduceId = new TaskAttemptID(new TaskID(this.jobId, TaskType.Reduce
, this.taskId), 0);
LocalJobRunner.Log.Info("Starting task: " + reduceId);
ReduceTask reduce = new ReduceTask(this._enclosing.systemJobFile.ToString(), reduceId
, this.taskId, this._enclosing.mapIds.Count, 1);
reduce.SetUser(UserGroupInformation.GetCurrentUser().GetShortUserName());
LocalJobRunner.SetupChildMapredLocalDirs(reduce, this.localConf);
reduce.SetLocalMapFiles(this.mapOutputFiles);
if (!this._enclosing.IsInterrupted())
{
reduce.SetJobFile(this._enclosing.localJobFile.ToString());
this.localConf.SetUser(reduce.GetUser());
reduce.LocalizeConfiguration(this.localConf);
reduce.SetConf(this.localConf);
try
{
this._enclosing._enclosing.reduce_tasks.GetAndIncrement();
this._enclosing._enclosing.myMetrics.LaunchReduce(reduce.GetTaskID());
reduce.Run(this.localConf, this._enclosing);
this._enclosing._enclosing.myMetrics.CompleteReduce(reduce.GetTaskID());
}
finally
{
this._enclosing._enclosing.reduce_tasks.GetAndDecrement();
}
LocalJobRunner.Log.Info("Finishing task: " + reduceId);
}
else
{
throw new Exception();
}
}
catch (Exception t)
{
// store this to be rethrown in the initial thread context.
this.storedException = t;
}
}
/// <exception cref="Sharpen.RuntimeException"/>
/// <exception cref="System.IO.IOException"/>
private void RunSubtask(Task task, TaskType taskType, TaskAttemptId attemptID, int
numMapTasks, bool renameOutputs, IDictionary <TaskAttemptID, MapOutputFile> localMapFiles
)
{
TaskAttemptID classicAttemptID = TypeConverter.FromYarn(attemptID);
try
{
JobConf conf = new JobConf(this._enclosing.GetConfig());
conf.Set(JobContext.TaskId, task.GetTaskID().ToString());
conf.Set(JobContext.TaskAttemptId, classicAttemptID.ToString());
conf.SetBoolean(JobContext.TaskIsmap, (taskType == TaskType.Map));
conf.SetInt(JobContext.TaskPartition, task.GetPartition());
conf.Set(JobContext.Id, task.GetJobID().ToString());
// Use the AM's local dir env to generate the intermediate step
// output files
string[] localSysDirs = StringUtils.GetTrimmedStrings(Runtime.Getenv(ApplicationConstants.Environment
.LocalDirs.ToString()));
conf.SetStrings(MRConfig.LocalDir, localSysDirs);
LocalContainerLauncher.Log.Info(MRConfig.LocalDir + " for uber task: " + conf.Get
(MRConfig.LocalDir));
// mark this as an uberized subtask so it can set task counter
// (longer-term/FIXME: could redefine as job counter and send
// "JobCounterEvent" to JobImpl on [successful] completion of subtask;
// will need new Job state-machine transition and JobImpl jobCounters
// map to handle)
conf.SetBoolean("mapreduce.task.uberized", true);
// Check and handle Encrypted spill key
task.SetEncryptedSpillKey(this._enclosing.encryptedSpillKey);
YarnChild.SetEncryptedSpillKeyIfRequired(task);
// META-FIXME: do we want the extra sanity-checking (doneWithMaps,
// etc.), or just assume/hope the state machine(s) and uber-AM work
// as expected?
if (taskType == TaskType.Map)
{
if (this.doneWithMaps)
{
LocalContainerLauncher.Log.Error("CONTAINER_REMOTE_LAUNCH contains a map task ("
+ attemptID + "), but should be finished with maps");
throw new RuntimeException();
}
MapTask map = (MapTask)task;
map.SetConf(conf);
map.Run(conf, this._enclosing.umbilical);
if (renameOutputs)
{
MapOutputFile renamed = LocalContainerLauncher.RenameMapOutputForReduce(conf, attemptID
, map.GetMapOutputFile());
localMapFiles[classicAttemptID] = renamed;
}
this.Relocalize();
if (++this.finishedSubMaps == numMapTasks)
{
this.doneWithMaps = true;
}
}
else
{
/* TaskType.REDUCE */
if (!this.doneWithMaps)
{
// check if event-queue empty? whole idea of counting maps vs.
// checking event queue is a tad wacky...but could enforce ordering
// (assuming no "lost events") at LocalMRAppMaster [CURRENT BUG(?):
// doesn't send reduce event until maps all done]
LocalContainerLauncher.Log.Error("CONTAINER_REMOTE_LAUNCH contains a reduce task ("
+ attemptID + "), but not yet finished with maps");
throw new RuntimeException();
}
// a.k.a. "mapreduce.jobtracker.address" in LocalJobRunner:
// set framework name to local to make task local
conf.Set(MRConfig.FrameworkName, MRConfig.LocalFrameworkName);
conf.Set(MRConfig.MasterAddress, "local");
// bypass shuffle
ReduceTask reduce = (ReduceTask)task;
reduce.SetLocalMapFiles(localMapFiles);
reduce.SetConf(conf);
reduce.Run(conf, this._enclosing.umbilical);
this.Relocalize();
}
}
catch (FSError e)
{
LocalContainerLauncher.Log.Fatal("FSError from child", e);
// umbilical: MRAppMaster creates (taskAttemptListener), passes to us
if (!ShutdownHookManager.Get().IsShutdownInProgress())
{
this._enclosing.umbilical.FsError(classicAttemptID, e.Message);
}
throw new RuntimeException();
}
catch (Exception exception)
{
LocalContainerLauncher.Log.Warn("Exception running local (uberized) 'child' : " +
StringUtils.StringifyException(exception));
try
{
if (task != null)
{
// do cleanup for the task
task.TaskCleanup(this._enclosing.umbilical);
}
}
catch (Exception e)
{
LocalContainerLauncher.Log.Info("Exception cleaning up: " + StringUtils.StringifyException
(e));
}
// Report back any failures, for diagnostic purposes
this._enclosing.umbilical.ReportDiagnosticInfo(classicAttemptID, StringUtils.StringifyException
(exception));
throw new RuntimeException();
}
catch (Exception throwable)
{
LocalContainerLauncher.Log.Fatal("Error running local (uberized) 'child' : " + StringUtils
.StringifyException(throwable));
if (!ShutdownHookManager.Get().IsShutdownInProgress())
{
Exception tCause = throwable.InnerException;
string cause = (tCause == null) ? throwable.Message : StringUtils.StringifyException
(tCause);
this._enclosing.umbilical.FatalError(classicAttemptID, cause);
}
throw new RuntimeException();
}
}
