io.druid.indexing.common.task

Class CompactionTask

java.lang.Object

io.druid.indexing.common.task.AbstractTask

io.druid.indexing.common.task.CompactionTask

All Implemented Interfaces:

Task

public class CompactionTask
extends AbstractTask

Constructor Summary

Constructors

Constructor and Description
CompactionTask(String id, TaskResource taskResource, String dataSource, org.joda.time.Interval interval, List<DataSegment> segments, DimensionsSpec dimensionsSpec, IndexTask.IndexTuningConfig tuningConfig, Map<String,Object> context, com.fasterxml.jackson.databind.ObjectMapper jsonMapper)

Method Summary

Modifier and Type	Method and Description
DimensionsSpec	getDimensionsSpec()
org.joda.time.Interval	getInterval()
int	getPriority() Returns task priority.
List<DataSegment>	getSegments()
IndexTask.IndexTuningConfig	getTuningConfig()
String	getType() Returns a descriptive label for this task type.
boolean	isReady(TaskActionClient taskActionClient) Execute preflight actions for a task.
TaskStatus	run(TaskToolbox toolbox) Execute a task.

Methods inherited from class io.druid.indexing.common.task.AbstractTask

canRestore, equals, getClasspathPrefix, getContext, getDataSource, getGroupId, getId, getNodeType, getQueryRunner, getTaskResource, hashCode, stopGracefully, success, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface io.druid.indexing.common.task.Task

getContextValue, getContextValue

Constructor Detail

CompactionTask

public CompactionTask(String id,
                      TaskResource taskResource,
                      String dataSource,
                      @Nullable
                      org.joda.time.Interval interval,
                      @Nullable
                      List<DataSegment> segments,
                      @Nullable
                      DimensionsSpec dimensionsSpec,
                      @Nullable
                      IndexTask.IndexTuningConfig tuningConfig,
                      @Nullable
                      Map<String,Object> context,
                      com.fasterxml.jackson.databind.ObjectMapper jsonMapper)

Method Detail

getInterval

public org.joda.time.Interval getInterval()

getSegments

public List<DataSegment> getSegments()

getDimensionsSpec

public DimensionsSpec getDimensionsSpec()

getTuningConfig

public IndexTask.IndexTuningConfig getTuningConfig()

getType

public String getType()

Description copied from interface: Task

Returns a descriptive label for this task type. Used for metrics emission and logging.

Returns:

task type label

getPriority

public int getPriority()

Description copied from interface: Task

Returns task priority. The task priority is currently used only for prioritized locking, but, in the future, it can be used for task scheduling, cluster resource management, etc.

Returns:

task priority

See Also:

for default task priorities

isReady

public boolean isReady(TaskActionClient taskActionClient)
                throws Exception

Description copied from interface: Task

Execute preflight actions for a task. This can be used to acquire locks, check preconditions, and so on. The actions must be idempotent, since this method may be executed multiple times. This typically runs on the coordinator. If this method throws an exception, the task should be considered a failure.

This method must be idempotent, as it may be run multiple times per task.

Parameters:

taskActionClient - action client for this task (not the full toolbox)

Returns:

true if ready, false if not ready yet

Throws:

Exception - if the task should be considered a failure

run

public TaskStatus run(TaskToolbox toolbox)
               throws Exception

Description copied from interface: Task

Execute a task. This typically runs on a worker as determined by a TaskRunner, and will be run while holding a lock on our dataSource and implicit lock interval (if any). If this method throws an exception, the task should be considered a failure.

Parameters:

toolbox - Toolbox for this task

Returns:

Some kind of finished status (isRunnable must be false).

Throws:

Exception - if this task failed