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);
}
