alluxio.master.lineage.checkpoint

Class CheckpointLatestPlanner

java.lang.Object

alluxio.master.lineage.checkpoint.CheckpointLatestPlanner

All Implemented Interfaces:

CheckpointPlanner

@ThreadSafe
public final class CheckpointLatestPlanner
extends Object
implements CheckpointPlanner

This class tries to checkpoint the latest created lineage that is ready for persistence. This class serves as an example to implement a planner.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.master.lineage.checkpoint.CheckpointPlanner

CheckpointPlanner.Factory

Constructor Summary

Constructors

Constructor and Description
CheckpointLatestPlanner(LineageStoreView lineageStoreView, FileSystemMasterView fileSystemMasterView) Creates a new instance of CheckpointLatestPlanner, which does not use the lineage store view.

Method Summary

Modifier and Type	Method and Description
CheckpointPlan	generatePlan(LineageStoreView store, FileSystemMasterView fileSystemMasterView) Generates a plan to decide what lineages to checkpoint.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CheckpointLatestPlanner

public CheckpointLatestPlanner(LineageStoreView lineageStoreView,
                               FileSystemMasterView fileSystemMasterView)

Creates a new instance of CheckpointLatestPlanner, which does not use the lineage store view.

Parameters:

lineageStoreView - a view of a lineage store

fileSystemMasterView - a view of the file system master

Method Detail

generatePlan

public CheckpointPlan generatePlan(LineageStoreView store,
                                   FileSystemMasterView fileSystemMasterView)

Description copied from interface: CheckpointPlanner

Generates a plan to decide what lineages to checkpoint.

This method returns null if the planner fails to propose a feasible plan to find the lineages to checkpoint. If the checkpoint plan has no lineages, it indicates that the planner has no actions to take and the requirement is already met.

Specified by:

generatePlan in interface CheckpointPlanner

Parameters:

store - a readonly view of the lineage store

fileSystemMasterView - a readonly view of the file system master

Returns:

a plan (possibly empty) to checkpoint the lineages, or null if no plan is feasible