/// <summary>Run the map task.</summary>
/// <param name="input">the set of inputs</param>
/// <param name="output">the object to collect the outputs of the map</param>
/// <param name="reporter">the object to update with status</param>
/// <exception cref="System.IO.IOException"/>
public override void Run(RecordReader <K1, V1> input, OutputCollector <K2, V2> output
, Reporter reporter)
{
Application <K1, V1, K2, V2> application = null;
try
{
RecordReader <FloatWritable, NullWritable> fakeInput = (!Submitter.GetIsJavaRecordReader
(job) && !Submitter.GetIsJavaMapper(job)) ? (RecordReader <FloatWritable, NullWritable
>)input : null;
application = new Application <K1, V1, K2, V2>(job, fakeInput, output, reporter, (
Type)job.GetOutputKeyClass(), (Type)job.GetOutputValueClass());
}
catch (Exception ie)
{
throw new RuntimeException("interrupted", ie);
}
DownwardProtocol <K1, V1> downlink = application.GetDownlink();
bool isJavaInput = Submitter.GetIsJavaRecordReader(job);
downlink.RunMap(reporter.GetInputSplit(), job.GetNumReduceTasks(), isJavaInput);
bool skipping = job.GetBoolean(MRJobConfig.SkipRecords, false);
try
{
if (isJavaInput)
{
// allocate key & value instances that are re-used for all entries
K1 key = input.CreateKey();
V1 value = input.CreateValue();
downlink.SetInputTypes(key.GetType().FullName, value.GetType().FullName);
while (input.Next(key, value))
{
// map pair to output
downlink.MapItem(key, value);
if (skipping)
{
//flush the streams on every record input if running in skip mode
//so that we don't buffer other records surrounding a bad record.
downlink.Flush();
}
}
downlink.EndOfInput();
}
application.WaitForFinish();
}
catch (Exception t)
{
application.Abort(t);
}
finally
{
application.Cleanup();
}
}
/// <exception cref="System.IO.IOException"/>
private void StartApplication(OutputCollector <K3, V3> output, Reporter reporter)
{
if (application == null)
{
try
{
Log.Info("starting application");
application = new Application <K2, V2, K3, V3>(job, null, output, reporter, (Type)
job.GetOutputKeyClass(), (Type)job.GetOutputValueClass());
downlink = application.GetDownlink();
}
catch (Exception ie)
{
throw new RuntimeException("interrupted", ie);
}
int reduce = 0;
downlink.RunReduce(reduce, Submitter.GetIsJavaRecordWriter(job));
}
}
/// <summary>Start the child process to handle the task for us.</summary>
/// <param name="conf">the task's configuration</param>
/// <param name="recordReader">the fake record reader to update progress with</param>
/// <param name="output">the collector to send output to</param>
/// <param name="reporter">the reporter for the task</param>
/// <param name="outputKeyClass">the class of the output keys</param>
/// <param name="outputValueClass">the class of the output values</param>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
internal Application(JobConf conf, RecordReader <FloatWritable, NullWritable> recordReader
, OutputCollector <K2, V2> output, Reporter reporter, Type outputKeyClass, Type outputValueClass
)
{
serverSocket = Sharpen.Extensions.CreateServerSocket(0);
IDictionary <string, string> env = new Dictionary <string, string>();
// add TMPDIR environment variable with the value of java.io.tmpdir
env["TMPDIR"] = Runtime.GetProperty("java.io.tmpdir");
env[Submitter.Port] = Sharpen.Extensions.ToString(serverSocket.GetLocalPort());
//Add token to the environment if security is enabled
Org.Apache.Hadoop.Security.Token.Token <JobTokenIdentifier> jobToken = TokenCache.
GetJobToken(conf.GetCredentials());
// This password is used as shared secret key between this application and
// child pipes process
byte[] password = jobToken.GetPassword();
string localPasswordFile = new FilePath(".") + Path.Separator + "jobTokenPassword";
WritePasswordToLocalFile(localPasswordFile, password, conf);
env["hadoop.pipes.shared.secret.location"] = localPasswordFile;
IList <string> cmd = new AList <string>();
string interpretor = conf.Get(Submitter.Interpretor);
if (interpretor != null)
{
cmd.AddItem(interpretor);
}
string executable = DistributedCache.GetLocalCacheFiles(conf)[0].ToString();
if (!FileUtil.CanExecute(new FilePath(executable)))
{
// LinuxTaskController sets +x permissions on all distcache files already.
// In case of DefaultTaskController, set permissions here.
FileUtil.Chmod(executable, "u+x");
}
cmd.AddItem(executable);
// wrap the command in a stdout/stderr capture
// we are starting map/reduce task of the pipes job. this is not a cleanup
// attempt.
TaskAttemptID taskid = ((TaskAttemptID)TaskAttemptID.ForName(conf.Get(MRJobConfig
.TaskAttemptId)));
FilePath stdout = TaskLog.GetTaskLogFile(taskid, false, TaskLog.LogName.Stdout);
FilePath stderr = TaskLog.GetTaskLogFile(taskid, false, TaskLog.LogName.Stderr);
long logLength = TaskLog.GetTaskLogLength(conf);
cmd = TaskLog.CaptureOutAndError(null, cmd, stdout, stderr, logLength, false);
process = RunClient(cmd, env);
clientSocket = serverSocket.Accept();
string challenge = GetSecurityChallenge();
string digestToSend = CreateDigest(password, challenge);
string digestExpected = CreateDigest(password, digestToSend);
handler = new OutputHandler <K2, V2>(output, reporter, recordReader, digestExpected
);
K2 outputKey = (K2)ReflectionUtils.NewInstance(outputKeyClass, conf);
V2 outputValue = (V2)ReflectionUtils.NewInstance(outputValueClass, conf);
downlink = new BinaryProtocol <K1, V1, K2, V2>(clientSocket, handler, outputKey, outputValue
, conf);
downlink.Authenticate(digestToSend, challenge);
WaitForAuthentication();
Log.Debug("Authentication succeeded");
downlink.Start();
downlink.SetJobConf(conf);
}
public BinaryProtocol(Stream down, DownwardProtocol handler, Stream up)
{
this.down = down;
this.uplink = new BinaryUpwardProtocol(up);
this.handler = handler;
}