org.apache.spark.scheduler

Interface SchedulerBackend

public interface SchedulerBackend

A backend interface for scheduling systems that allows plugging in different ones under TaskSchedulerImpl. We assume a Mesos-like model where the application gets resource offers as machines become available and can launch tasks on them.

Method Summary

Modifier and Type	Method and Description
String	appId()
scala.Option<String>	applicationAttemptId() Get the attempt ID for this run, if the cluster manager supports multiple attempts.
String	applicationId() Get an application ID associated with the job.
int	defaultParallelism()
scala.Option<scala.collection.immutable.Map<String,String>>	getDriverLogUrls() Get the URLs for the driver logs.
boolean	isReady()
void	killTask(long taskId, String executorId, boolean interruptThread, String reason) Requests that an executor kills a running task.
int	maxNumConcurrentTasks() Get the max number of tasks that can be concurrent launched currently.
void	reviveOffers()
void	start()
void	stop()

Method Detail

appId

String appId()

applicationAttemptId

scala.Option<String> applicationAttemptId()

Get the attempt ID for this run, if the cluster manager supports multiple attempts. Applications run in client mode will not have attempt IDs.

Returns:

The application attempt id, if available.

applicationId

String applicationId()

Get an application ID associated with the job.

Returns:

An application ID

defaultParallelism

int defaultParallelism()

getDriverLogUrls

scala.Option<scala.collection.immutable.Map<String,String>> getDriverLogUrls()

Get the URLs for the driver logs. These URLs are used to display the links in the UI Executors tab for the driver.

Returns:

Map containing the log names and their respective URLs

isReady

boolean isReady()

killTask

void killTask(long taskId,
              String executorId,
              boolean interruptThread,
              String reason)

Requests that an executor kills a running task.

Parameters:

taskId - Id of the task.

executorId - Id of the executor the task is running on.

interruptThread - Whether the executor should interrupt the task thread.

reason - The reason for the task kill.

maxNumConcurrentTasks

int maxNumConcurrentTasks()

Get the max number of tasks that can be concurrent launched currently. Note that please don't cache the value returned by this method, because the number can change due to add/remove executors.

Returns:

The max number of tasks that can be concurrent launched currently.

reviveOffers

void reviveOffers()

start

void start()

stop

void stop()