org.apache.hadoop.hbase.master.normalizer

类 SimpleRegionNormalizer

java.lang.Object

org.apache.hadoop.hbase.master.normalizer.SimpleRegionNormalizer

所有已实现的接口:

RegionNormalizer

@InterfaceAudience.Private
public class SimpleRegionNormalizer
extends Object
implements RegionNormalizer

Simple implementation of region normalizer. Logic in use:

1. Get all regions of a given table
2. Get avg size S of each region (by total size of store files reported in RegionMetrics)
3. Seek every single region one by one. If a region R0 is bigger than S * 2, it is kindly requested to split. Thereon evaluate the next region R1
4. Otherwise, if R0 + R1 is smaller than S, R0 and R1 are kindly requested to merge. Thereon evaluate the next region R2
5. Otherwise, R1 is evaluated

Region sizes are coarse and approximate on the order of megabytes. Additionally, "empty" regions (less than 1MB, with the previous note) are not merged away. This is by design to prevent normalization from undoing the pre-splitting of a table.

构造器概要

构造器

构造器和说明
SimpleRegionNormalizer()

方法概要

限定符和类型	方法和说明
List<NormalizationPlan>	computePlanForTable(TableName table) Computes next most "urgent" normalization action on the table.
long	getSkippedCount(NormalizationPlan.PlanType type)
void	planSkipped(RegionInfo hri, NormalizationPlan.PlanType type) Notification for the case where plan couldn't be executed due to constraint violation, such as namespace quota
void	setMasterRpcServices(MasterRpcServices masterRpcServices) Set the master RPC service.
void	setMasterServices(MasterServices masterServices) Set the master service.

从类继承的方法 java.lang.Object

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

构造器详细资料

SimpleRegionNormalizer

public SimpleRegionNormalizer()

方法详细资料

setMasterServices

public void setMasterServices(MasterServices masterServices)

Set the master service.

指定者:

setMasterServices 在接口中 RegionNormalizer

参数:

masterServices - inject instance of MasterServices

setMasterRpcServices

public void setMasterRpcServices(MasterRpcServices masterRpcServices)

从接口复制的说明: RegionNormalizer

Set the master RPC service. Must be called before first call to RegionNormalizer.computePlanForTable(TableName).

指定者:

setMasterRpcServices 在接口中 RegionNormalizer

参数:

masterRpcServices - master RPC services to use

planSkipped

public void planSkipped(RegionInfo hri,
                        NormalizationPlan.PlanType type)

从接口复制的说明: RegionNormalizer

Notification for the case where plan couldn't be executed due to constraint violation, such as namespace quota

指定者:

planSkipped 在接口中 RegionNormalizer

参数:

hri - the region which is involved in the plan

type - type of plan

getSkippedCount

public long getSkippedCount(NormalizationPlan.PlanType type)

指定者:

getSkippedCount 在接口中 RegionNormalizer

参数:

type - type of plan for which skipped count is to be returned

返回:

the count of plans of specified type which were skipped

computePlanForTable

public List<NormalizationPlan> computePlanForTable(TableName table)
                                            throws HBaseIOException

Computes next most "urgent" normalization action on the table. Action may be either a split, or a merge, or no action.

指定者:

computePlanForTable 在接口中 RegionNormalizer

参数:

table - table to normalize

返回:

normalization plan to execute

抛出:

HBaseIOException