SimpleRegionNormalizer (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.master.normalizer.SimpleRegionNormalizer

All Implemented Interfaces:

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 RegionLoad)
3. If biggest region is bigger than S * 2, it is kindly requested to split, and normalization stops
4. Otherwise, two smallest region R1 and its smallest neighbor R2 are kindly requested to merge, if R1 + R1 < S, and normalization stops
5. Otherwise, no action is performed
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.

Constructor Summary

Constructors
Constructor and Description

SimpleRegionNormalizer()

Method Summary

Methods
Modifier and Type	Method and Description
`List<NormalizationPlan>`	`computePlanForTable(TableName table)` Computes next most "urgent" normalization action on the table.
`void`	`setMasterRpcServices(MasterRpcServices masterRpcServices)` Set the master RPC service.
`void`	`setMasterServices(MasterServices masterServices)` Set the master service.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SimpleRegionNormalizer
```
public SimpleRegionNormalizer()
```
- Method Detail
  - setMasterServices
```
public void setMasterServices(MasterServices masterServices)
```
    Set the master service.
    
    Specified by:
    
    setMasterServices in interface RegionNormalizer
    
    Parameters:
    masterServices - inject instance of MasterServices
  - setMasterRpcServices
```
public void setMasterRpcServices(MasterRpcServices masterRpcServices)
```
    Description copied from interface: RegionNormalizer
    
    Set the master RPC service. Must be called before first call to RegionNormalizer.computePlanForTable(TableName).
    
    Specified by:
    
    setMasterRpcServices in interface RegionNormalizer
    
    Parameters:
    masterRpcServices - master RPC services to use
  - 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.
    
    Specified by:
    
    computePlanForTable in interface RegionNormalizer
    
    Parameters:
    table - table to normalize
    
    Returns:
    normalization plan to execute
    
    Throws:
    
    HBaseIOException

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