public virtual void RegisterPendingTask(Task task, WrappedJvmID jvmID)
{
// Create the mapping so that it is easy to look up
// when the jvm comes back to ask for Task.
// A JVM not present in this map is an illegal task/JVM.
jvmIDToActiveAttemptMap[jvmID] = task;
}
public virtual void RegisterLaunchedTask(TaskAttemptId attemptID, WrappedJvmID jvmId
)
{
// The AM considers the task to be launched (Has asked the NM to launch it)
// The JVM will only be given a task after this registartion.
launchedJVMs.AddItem(jvmId);
taskHeartbeatHandler.Register(attemptID);
}
public virtual void Unregister(TaskAttemptId attemptID, WrappedJvmID jvmID)
{
// Unregistration also comes from the same TaskAttempt which does the
// registration. Events are ordered at TaskAttempt, so unregistration will
// always come after registration.
// Remove from launchedJVMs before jvmIDToActiveAttemptMap to avoid
// synchronization issue with getTask(). getTask should be checking
// jvmIDToActiveAttemptMap before it checks launchedJVMs.
// remove the mappings if not already removed
launchedJVMs.Remove(jvmID);
Sharpen.Collections.Remove(jvmIDToActiveAttemptMap, jvmID);
//unregister this attempt
taskHeartbeatHandler.Unregister(attemptID);
}
/// <exception cref="System.IO.IOException"/>
public virtual JvmTask GetTask(JvmContext context)
{
// A rough imitation of code from TaskTracker.
JVMId jvmId = context.jvmId;
Log.Info("JVM with ID : " + jvmId + " asked for a task");
JvmTask jvmTask = null;
// TODO: Is it an authorized container to get a task? Otherwise return null.
// TODO: Child.java's firstTaskID isn't really firstTaskID. Ask for update
// to jobId and task-type.
WrappedJvmID wJvmID = new WrappedJvmID(jvmId.GetJobId(), jvmId.isMap, jvmId.GetId
());
// Try to look up the task. We remove it directly as we don't give
// multiple tasks to a JVM
if (!jvmIDToActiveAttemptMap.Contains(wJvmID))
{
Log.Info("JVM with ID: " + jvmId + " is invalid and will be killed.");
jvmTask = TaskForInvalidJvm;
}
else
{
if (!launchedJVMs.Contains(wJvmID))
{
jvmTask = null;
Log.Info("JVM with ID: " + jvmId + " asking for task before AM launch registered. Given null task"
);
}
else
{
// remove the task as it is no more needed and free up the memory.
// Also we have already told the JVM to process a task, so it is no
// longer pending, and further request should ask it to exit.
Task task = Sharpen.Collections.Remove(jvmIDToActiveAttemptMap, wJvmID);
launchedJVMs.Remove(wJvmID);
Log.Info("JVM with ID: " + jvmId + " given task: " + task.GetTaskID());
task.SetEncryptedSpillKey(encryptedSpillKey);
jvmTask = new JvmTask(task, false);
}
}
return(jvmTask);
}
/// <exception cref="System.IO.IOException"/>
public virtual void TestGetTask()
{
AppContext appCtx = Org.Mockito.Mockito.Mock <AppContext>();
JobTokenSecretManager secret = Org.Mockito.Mockito.Mock <JobTokenSecretManager>();
RMHeartbeatHandler rmHeartbeatHandler = Org.Mockito.Mockito.Mock <RMHeartbeatHandler
>();
TaskHeartbeatHandler hbHandler = Org.Mockito.Mockito.Mock <TaskHeartbeatHandler>();
TestTaskAttemptListenerImpl.MockTaskAttemptListenerImpl listener = new TestTaskAttemptListenerImpl.MockTaskAttemptListenerImpl
(appCtx, secret, rmHeartbeatHandler, hbHandler);
Configuration conf = new Configuration();
listener.Init(conf);
listener.Start();
JVMId id = new JVMId("foo", 1, true, 1);
WrappedJvmID wid = new WrappedJvmID(id.GetJobId(), id.isMap, id.GetId());
// Verify ask before registration.
//The JVM ID has not been registered yet so we should kill it.
JvmContext context = new JvmContext();
context.jvmId = id;
JvmTask result = listener.GetTask(context);
NUnit.Framework.Assert.IsNotNull(result);
NUnit.Framework.Assert.IsTrue(result.shouldDie);
// Verify ask after registration but before launch.
// Don't kill, should be null.
TaskAttemptId attemptID = Org.Mockito.Mockito.Mock <TaskAttemptId>();
Task task = Org.Mockito.Mockito.Mock <Task>();
//Now put a task with the ID
listener.RegisterPendingTask(task, wid);
result = listener.GetTask(context);
NUnit.Framework.Assert.IsNull(result);
// Unregister for more testing.
listener.Unregister(attemptID, wid);
// Verify ask after registration and launch
//Now put a task with the ID
listener.RegisterPendingTask(task, wid);
listener.RegisterLaunchedTask(attemptID, wid);
Org.Mockito.Mockito.Verify(hbHandler).Register(attemptID);
result = listener.GetTask(context);
NUnit.Framework.Assert.IsNotNull(result);
NUnit.Framework.Assert.IsFalse(result.shouldDie);
// Don't unregister yet for more testing.
//Verify that if we call it again a second time we are told to die.
result = listener.GetTask(context);
NUnit.Framework.Assert.IsNotNull(result);
NUnit.Framework.Assert.IsTrue(result.shouldDie);
listener.Unregister(attemptID, wid);
// Verify after unregistration.
result = listener.GetTask(context);
NUnit.Framework.Assert.IsNotNull(result);
NUnit.Framework.Assert.IsTrue(result.shouldDie);
listener.Stop();
// test JVMID
JVMId jvmid = JVMId.ForName("jvm_001_002_m_004");
NUnit.Framework.Assert.IsNotNull(jvmid);
try
{
JVMId.ForName("jvm_001_002_m_004_006");
Assert.Fail();
}
catch (ArgumentException e)
{
NUnit.Framework.Assert.AreEqual(e.Message, "TaskId string : jvm_001_002_m_004_006 is not properly formed"
);
}
}