io.prestosql.execution

Interface TaskManager

All Known Implementing Classes:

SqlTaskManager

public interface TaskManager

Method Summary

Modifier and Type	Method and Description
TaskInfo	abortTask(TaskId taskId) Aborts a task.
TaskInfo	abortTaskResults(TaskId taskId, OutputBuffers.OutputBufferId bufferId) Aborts a result buffer for a task.
void	acknowledgeTaskResults(TaskId taskId, OutputBuffers.OutputBufferId bufferId, long sequenceId) Acknowledges previously received results.
void	addStateChangeListener(TaskId taskId, StateMachine.StateChangeListener<TaskState> stateChangeListener) Adds a state change listener to the specified task.
TaskInfo	cancelTask(TaskId taskId) Cancels a task.
List<TaskInfo>	getAllTaskInfo() Gets all of the currently tracked tasks.
TaskInfo	getTaskInfo(TaskId taskId) Gets the info for the specified task.
com.google.common.util.concurrent.ListenableFuture<TaskInfo>	getTaskInfo(TaskId taskId, TaskState currentState) Gets future info for the task after the state changes from current state.
String	getTaskInstanceId(TaskId taskId) Gets the unique instance id of a task.
com.google.common.util.concurrent.ListenableFuture<BufferResult>	getTaskResults(TaskId taskId, OutputBuffers.OutputBufferId bufferId, long startingSequenceId, io.airlift.units.DataSize maxSize) Gets results from a task either immediately or in the future.
TaskStatus	getTaskStatus(TaskId taskId) Gets the status for the specified task.
com.google.common.util.concurrent.ListenableFuture<TaskStatus>	getTaskStatus(TaskId taskId, TaskState currentState) Gets future status for the task after the state changes from current state.
void	updateMemoryPoolAssignments(MemoryPoolAssignmentsRequest assignments)
TaskInfo	updateTask(Session session, TaskId taskId, Optional<PlanFragment> fragment, List<TaskSource> sources, OutputBuffers outputBuffers, OptionalInt totalPartitions) Updates the task plan, sources and output buffers.

Method Detail

getAllTaskInfo

List<TaskInfo> getAllTaskInfo()

Gets all of the currently tracked tasks. This will included uninitialized, running, and completed tasks.

getTaskInfo

TaskInfo getTaskInfo(TaskId taskId)

Gets the info for the specified task. If the task has not been created yet, an uninitialized task is created and the info is returned.

NOTE: this design assumes that only tasks that will eventually exist are queried.

getTaskStatus

TaskStatus getTaskStatus(TaskId taskId)

Gets the status for the specified task.

getTaskInfo

com.google.common.util.concurrent.ListenableFuture<TaskInfo> getTaskInfo(TaskId taskId,
                                                                         TaskState currentState)

Gets future info for the task after the state changes from current state. If the task has not been created yet, an uninitialized task is created and the future is returned. If the task is already in a final state, the info is returned immediately.

NOTE: this design assumes that only tasks that will eventually exist are queried.

getTaskInstanceId

String getTaskInstanceId(TaskId taskId)

Gets the unique instance id of a task. This can be used to detect a task that was destroyed and recreated.

getTaskStatus

com.google.common.util.concurrent.ListenableFuture<TaskStatus> getTaskStatus(TaskId taskId,
                                                                             TaskState currentState)

Gets future status for the task after the state changes from current state. If the task has not been created yet, an uninitialized task is created and the future is returned. If the task is already in a final state, the status is returned immediately.

NOTE: this design assumes that only tasks that will eventually exist are queried.

updateMemoryPoolAssignments

void updateMemoryPoolAssignments(MemoryPoolAssignmentsRequest assignments)

updateTask

TaskInfo updateTask(Session session,
                    TaskId taskId,
                    Optional<PlanFragment> fragment,
                    List<TaskSource> sources,
                    OutputBuffers outputBuffers,
                    OptionalInt totalPartitions)

Updates the task plan, sources and output buffers. If the task does not already exist, is is created and then updated.

cancelTask

TaskInfo cancelTask(TaskId taskId)

Cancels a task. If the task does not already exist, is is created and then canceled.

abortTask

TaskInfo abortTask(TaskId taskId)

Aborts a task. If the task does not already exist, is is created and then aborted.

getTaskResults

com.google.common.util.concurrent.ListenableFuture<BufferResult> getTaskResults(TaskId taskId,
                                                                                OutputBuffers.OutputBufferId bufferId,
                                                                                long startingSequenceId,
                                                                                io.airlift.units.DataSize maxSize)

Gets results from a task either immediately or in the future. If the task or buffer has not been created yet, an uninitialized task is created and a future is returned.

NOTE: this design assumes that only tasks and buffers that will eventually exist are queried.

acknowledgeTaskResults

void acknowledgeTaskResults(TaskId taskId,
                            OutputBuffers.OutputBufferId bufferId,
                            long sequenceId)

Acknowledges previously received results.

abortTaskResults

TaskInfo abortTaskResults(TaskId taskId,
                          OutputBuffers.OutputBufferId bufferId)

Aborts a result buffer for a task. If the task or buffer has not been created yet, an uninitialized task is created and a the buffer is aborted.

NOTE: this design assumes that only tasks and buffers that will eventually exist are queried.

addStateChangeListener

void addStateChangeListener(TaskId taskId,
                            StateMachine.StateChangeListener<TaskState> stateChangeListener)

Adds a state change listener to the specified task. Listener is always notified asynchronously using a dedicated notification thread pool so, care should be taken to avoid leaking this when adding a listener in a constructor. Additionally, it is possible notifications are observed out of order due to the asynchronous execution.