Package org.apache.hadoop.ozone.container.common.interfaces

Class ContainerDeletionChoosingPolicyTemplate

java.lang.Object

org.apache.hadoop.ozone.container.common.interfaces.ContainerDeletionChoosingPolicyTemplate

All Implemented Interfaces:

ContainerDeletionChoosingPolicy

Direct Known Subclasses:

RandomContainerDeletionChoosingPolicy, TopNOrderedContainerDeletionChoosingPolicy

public abstract class ContainerDeletionChoosingPolicyTemplate
extends Object
implements ContainerDeletionChoosingPolicy

Abstract class that serves as the template for deletion choosing policy.

Constructor Summary

Constructors

Constructor	Description
ContainerDeletionChoosingPolicyTemplate()

Method Summary

Modifier and Type	Method	Description
final List<BlockDeletingService.ContainerBlockInfo>	chooseContainerForBlockDeletion(int blockCount, Map<Long,ContainerData> candidateContainers)	Chooses desired containers for block deletion.
protected abstract void	orderByDescendingPriority(List<ContainerData> candidateContainers)	Abstract step for ordering the container data to be deleted.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.ozone.container.common.interfaces.ContainerDeletionChoosingPolicy

isValidContainerType

Constructor Details

ContainerDeletionChoosingPolicyTemplate

public ContainerDeletionChoosingPolicyTemplate()

Method Details

chooseContainerForBlockDeletion

public final List<BlockDeletingService.ContainerBlockInfo> chooseContainerForBlockDeletion(int blockCount,
 Map<Long,ContainerData> candidateContainers)
                                                                                    throws org.apache.hadoop.hdds.scm.container.common.helpers.StorageContainerException

Description copied from interface: ContainerDeletionChoosingPolicy

Chooses desired containers for block deletion.

Specified by:

chooseContainerForBlockDeletion in interface ContainerDeletionChoosingPolicy

Parameters:

blockCount - how many to return

candidateContainers - candidate containers collection

Returns:

container data list

Throws:

org.apache.hadoop.hdds.scm.container.common.helpers.StorageContainerException

orderByDescendingPriority

protected abstract void orderByDescendingPriority(List<ContainerData> candidateContainers)

Abstract step for ordering the container data to be deleted. Subclass need to implement the concrete ordering implementation in descending order (more prioritized -> less prioritized)

Parameters:

candidateContainers - candidate containers to be ordered