org.apache.mesos

Interface SchedulerDriver

All Known Implementing Classes:

MesosSchedulerDriver

public interface SchedulerDriver

Abstract interface for connecting a scheduler to Mesos. This interface is used both to manage the scheduler's lifecycle (start it, stop it, or wait for it to finish) and to interact with Mesos (e.g., launch tasks, kill tasks, etc.).

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.mesos.Protos.Status	abort() Aborts the driver so that no more callbacks can be made to the scheduler.
org.apache.mesos.Protos.Status	declineOffer(org.apache.mesos.Protos.OfferID offerId) Declines an offer in its entirety.
org.apache.mesos.Protos.Status	declineOffer(org.apache.mesos.Protos.OfferID offerId, org.apache.mesos.Protos.Filters filters) Declines an offer in its entirety and applies the specified filters on the resources (see mesos.proto for a description of Filters).
org.apache.mesos.Protos.Status	join() Waits for the driver to be stopped or aborted, possibly blocking the current thread indefinitely.
org.apache.mesos.Protos.Status	killTask(org.apache.mesos.Protos.TaskID taskId) Kills the specified task.
org.apache.mesos.Protos.Status	launchTasks(Collection<org.apache.mesos.Protos.OfferID> offerIds, Collection<org.apache.mesos.Protos.TaskInfo> tasks) Launches the given set of tasks.
org.apache.mesos.Protos.Status	launchTasks(Collection<org.apache.mesos.Protos.OfferID> offerIds, Collection<org.apache.mesos.Protos.TaskInfo> tasks, org.apache.mesos.Protos.Filters filters) Launches the given set of tasks on a set of offers.
org.apache.mesos.Protos.Status	launchTasks(org.apache.mesos.Protos.OfferID offerId, Collection<org.apache.mesos.Protos.TaskInfo> tasks) Deprecated. Use launchTasks(Collection, Collection) instead.
org.apache.mesos.Protos.Status	launchTasks(org.apache.mesos.Protos.OfferID offerId, Collection<org.apache.mesos.Protos.TaskInfo> tasks, org.apache.mesos.Protos.Filters filters) Deprecated. Use #launchTasks(Collection, Collection, Filters) instead.
org.apache.mesos.Protos.Status	reconcileTasks(Collection<org.apache.mesos.Protos.TaskStatus> statuses) Allows the framework to query the status for non-terminal tasks.
org.apache.mesos.Protos.Status	requestResources(Collection<org.apache.mesos.Protos.Request> requests) Requests resources from Mesos (see mesos.proto for a description of Request and how, for example, to request resources from specific slaves).
org.apache.mesos.Protos.Status	reviveOffers() Removes all filters, previously set by the framework (via launchTasks(java.util.Collection<org.apache.mesos.Protos.OfferID>, java.util.Collection<org.apache.mesos.Protos.TaskInfo>, org.apache.mesos.Protos.Filters)).
org.apache.mesos.Protos.Status	run() Starts and immediately joins (i.e., blocks on) the driver.
org.apache.mesos.Protos.Status	sendFrameworkMessage(org.apache.mesos.Protos.ExecutorID executorId, org.apache.mesos.Protos.SlaveID slaveId, byte[] data) Sends a message from the framework to one of its executors.
org.apache.mesos.Protos.Status	start() Starts the scheduler driver.
org.apache.mesos.Protos.Status	stop() Stops the scheduler driver assuming no failover.
org.apache.mesos.Protos.Status	stop(boolean failover) Stops the scheduler driver.

Method Detail

start

org.apache.mesos.Protos.Status start()

Starts the scheduler driver. This needs to be called before any other driver calls are made.

Returns:

The state of the driver after the call.

See Also:

Protos.Status

stop

org.apache.mesos.Protos.Status stop(boolean failover)

Stops the scheduler driver. If the 'failover' flag is set to false then it is expected that this framework will never reconnect to Mesos. So Mesos will unregister the framework and shutdown all its tasks and executors. If 'failover' is true, all executors and tasks will remain running (for some framework specific failover timeout) allowing the scheduler to reconnect (possibly in the same process, or from a different process, for example, on a different machine).

Parameters:

failover - Whether framework failover is expected.

Returns:

The state of the driver after the call.

See Also:

Protos.Status

stop

org.apache.mesos.Protos.Status stop()

Stops the scheduler driver assuming no failover. This will cause Mesos to unregister the framework and shutdown all its tasks and executors. Please see stop(boolean) for more details.

Returns:

The state of the driver after the call.

abort

org.apache.mesos.Protos.Status abort()

Aborts the driver so that no more callbacks can be made to the scheduler. The semantics of abort and stop have deliberately been separated so that code can detect an aborted driver (i.e., via the return status of join(), see below), and instantiate and start another driver if desired (from within the same process).

Returns:

The state of the driver after the call.

join

org.apache.mesos.Protos.Status join()

Waits for the driver to be stopped or aborted, possibly blocking the current thread indefinitely. The return status of this function can be used to determine if the driver was aborted (see mesos.proto for a description of Status).

Returns:

The state of the driver after the call.

run

org.apache.mesos.Protos.Status run()

Starts and immediately joins (i.e., blocks on) the driver.

Returns:

The state of the driver after the call.

requestResources

org.apache.mesos.Protos.Status requestResources(Collection<org.apache.mesos.Protos.Request> requests)

Requests resources from Mesos (see mesos.proto for a description of Request and how, for example, to request resources from specific slaves). Any resources available are offered to the framework via Scheduler.resourceOffers(org.apache.mesos.SchedulerDriver, java.util.List<org.apache.mesos.Protos.Offer>) callback, asynchronously.

Parameters:

requests - The resource requests.

Returns:

The state of the driver after the call.

See Also:

Protos.Request, Protos.Status

launchTasks

org.apache.mesos.Protos.Status launchTasks(Collection<org.apache.mesos.Protos.OfferID> offerIds,
                                         Collection<org.apache.mesos.Protos.TaskInfo> tasks,
                                         org.apache.mesos.Protos.Filters filters)

Launches the given set of tasks on a set of offers. Resources from offers are aggregated when more then one is provided. Note that all offers must belong to same slave. Any resources remaining (i.e., not used by the tasks or their executors) will be considered declined. The specified filters are applied on all unused resources (see mesos.proto for a description of Filters). Invoking this function with an empty collection of tasks declines offers in their entirety (see declineOffer(org.apache.mesos.Protos.OfferID, org.apache.mesos.Protos.Filters)).

Parameters:

offerIds - The collection of offer IDs.

tasks - The collection of tasks to be launched.

filters - The filters to set for any remaining resources.

Returns:

The state of the driver after the call.

See Also:

Protos.OfferID, Protos.TaskInfo, Protos.Filters, Protos.Status

launchTasks

org.apache.mesos.Protos.Status launchTasks(Collection<org.apache.mesos.Protos.OfferID> offerIds,
                                         Collection<org.apache.mesos.Protos.TaskInfo> tasks)

Launches the given set of tasks. See above for details.

Parameters:

offerIds - The collection of offer IDs.

tasks - The collection of tasks to be launched.

Returns:

The state of the driver after the call.

launchTasks

org.apache.mesos.Protos.Status launchTasks(org.apache.mesos.Protos.OfferID offerId,
                                         Collection<org.apache.mesos.Protos.TaskInfo> tasks,
                                         org.apache.mesos.Protos.Filters filters)

Deprecated. Use #launchTasks(Collection, Collection, Filters) instead.

Parameters:

offerId - The offer ID.

tasks - The collection of tasks to be launched.

filters - The filters to set for any remaining resources.

Returns:

The state of the driver after the call.

launchTasks

org.apache.mesos.Protos.Status launchTasks(org.apache.mesos.Protos.OfferID offerId,
                                         Collection<org.apache.mesos.Protos.TaskInfo> tasks)

Deprecated. Use launchTasks(Collection, Collection) instead.

Parameters:

offerId - The offer ID.

tasks - The collection of tasks to be launched.

Returns:

The state of the driver after the call.

killTask

org.apache.mesos.Protos.Status killTask(org.apache.mesos.Protos.TaskID taskId)

Kills the specified task. Note that attempting to kill a task is currently not reliable. If, for example, a scheduler fails over while it was attempting to kill a task it will need to retry in the future Likewise, if unregistered / disconnected, the request will be dropped (these semantics may be changed in the future).

Parameters:

taskId - The ID of the task to be killed.

Returns:

The state of the driver after the call.

declineOffer

org.apache.mesos.Protos.Status declineOffer(org.apache.mesos.Protos.OfferID offerId,
                                          org.apache.mesos.Protos.Filters filters)

Declines an offer in its entirety and applies the specified filters on the resources (see mesos.proto for a description of Filters). Note that this can be done at any time, it is not necessary to do this within the Scheduler.resourceOffers(org.apache.mesos.SchedulerDriver, java.util.List<org.apache.mesos.Protos.Offer>) callback.

Parameters:

offerId - The ID of the offer to be declined.

filters - The filters to set for any remaining resources.

Returns:

The state of the driver after the call.

See Also:

Protos.OfferID, Protos.Filters, Protos.Status

declineOffer

org.apache.mesos.Protos.Status declineOffer(org.apache.mesos.Protos.OfferID offerId)

Declines an offer in its entirety. See above for details.

Parameters:

offerId - The ID of the offer to be declined.

Returns:

The state of the driver after the call.

See Also:

Protos.OfferID, Protos.Status

reviveOffers

org.apache.mesos.Protos.Status reviveOffers()

Removes all filters, previously set by the framework (via launchTasks(java.util.Collection<org.apache.mesos.Protos.OfferID>, java.util.Collection<org.apache.mesos.Protos.TaskInfo>, org.apache.mesos.Protos.Filters)). This enables the framework to receive offers from those filtered slaves.

Returns:

The state of the driver after the call.

See Also:

Protos.Status

sendFrameworkMessage

org.apache.mesos.Protos.Status sendFrameworkMessage(org.apache.mesos.Protos.ExecutorID executorId,
                                                  org.apache.mesos.Protos.SlaveID slaveId,
                                                  byte[] data)

Sends a message from the framework to one of its executors. These messages are best effort; do not expect a framework message to be retransmitted in any reliable fashion.

Parameters:

executorId - The ID of the executor to send the message to.

slaveId - The ID of the slave that is running the executor.

data - The message.

Returns:

The state of the driver after the call.

See Also:

Protos.ExecutorID, Protos.SlaveID

reconcileTasks

org.apache.mesos.Protos.Status reconcileTasks(Collection<org.apache.mesos.Protos.TaskStatus> statuses)

Allows the framework to query the status for non-terminal tasks. This causes the master to send back the latest task status for each task in 'statuses', if possible. Tasks that are no longer known will result in a TASK_LOST update. If statuses is empty, then the master will send the latest status for each task currently known.

Parameters:

statuses - The collection of non-terminal TaskStatuses to reconcile.

Returns:

The state of the driver after the call.

See Also:

Protos.TaskStatus, Protos.SlaveID