SimpleRegionNormalizer (Apache HBase 1.2.12 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.

Field Summary

Fields
Modifier and Type	Field and Description
`private static org.apache.commons.logging.Log`	`LOG`
`private MasterServices`	`masterServices`
`private static int`	`MIN_REGION_COUNT`
`private Comparator<NormalizationPlan>`	`planComparator`

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.
`private long`	`getRegionSize(HRegionInfo hri)`
`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

- Field Detail
  - LOG
```
private static final org.apache.commons.logging.Log LOG
```
  - MIN_REGION_COUNT
```
private static final int MIN_REGION_COUNT
```
    See Also:
    Constant Field Values
  - masterServices
```
private MasterServices masterServices
```
  - planComparator
```
private Comparator<NormalizationPlan> planComparator
```
- 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
  - 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
  - getRegionSize
```
private long getRegionSize(HRegionInfo hri)
```

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