SimpleRegionNormalizer (Apache HBase 1.7.2 API)

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

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, RegionNormalizer
```
@InterfaceAudience.LimitedPrivate(value="Configuration")
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 the regions in the table (by total size of store files reported in RegionMetrics)
3. For each region R0, if R0 is bigger than S * 2, it is kindly requested to split.
4. Otherwise, for the next region in the chain R1, if R0 + R1 is smaller then S, R0 and R1 are kindly requested to merge.
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()

Constructors
Constructor and Description
`SimpleRegionNormalizer()`

Method Summary

Methods
Modifier and Type	Method and Description
`List<NormalizationPlan>`	`computePlansForTable(TableName table)` Computes next most "urgent" normalization action on the table.
`org.apache.hadoop.conf.Configuration`	`getConf()`
`int`	`getMergeMinRegionAge()` Return this instance's configured value for `MERGE_MIN_REGION_AGE_DAYS_KEY`.
`int`	`getMergeMinRegionSizeMb()` Return this instance's configured value for `MERGE_MIN_REGION_SIZE_MB_KEY`.
`int`	`getMinRegionCount()` Return this instance's configured value for `MIN_REGION_COUNT_KEY`.
`boolean`	`isMergeEnabled()` Return configured value for MasterSwitchType.MERGE.
`boolean`	`isSplitEnabled()` Return configured value for MasterSwitchType.SPLIT.
`void`	`setConf(org.apache.hadoop.conf.Configuration conf)`
`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
  - setMasterRpcServices
```
public void setMasterRpcServices(MasterRpcServices masterRpcServices)
```
    Description copied from interface: RegionNormalizer
    
    Set the master RPC service. Must be called before first call to RegionNormalizer.computePlansForTable(TableName).
    
    Specified by:
    
    setMasterRpcServices in interface RegionNormalizer
    
    Parameters:
    masterRpcServices - master RPC services to use
  - getConf
```
public org.apache.hadoop.conf.Configuration getConf()
```
    Specified by:
    
    getConf in interface org.apache.hadoop.conf.Configurable
  - setConf
```
public void setConf(org.apache.hadoop.conf.Configuration conf)
```
    Specified by:
    
    setConf in interface org.apache.hadoop.conf.Configurable
  - isSplitEnabled
```
public boolean isSplitEnabled()
```
    Return configured value for MasterSwitchType.SPLIT.
  - isMergeEnabled
```
public boolean isMergeEnabled()
```
    Return configured value for MasterSwitchType.MERGE.
  - getMinRegionCount
```
public int getMinRegionCount()
```
    Return this instance's configured value for MIN_REGION_COUNT_KEY.
  - getMergeMinRegionAge
```
public int getMergeMinRegionAge()
```
    Return this instance's configured value for MERGE_MIN_REGION_AGE_DAYS_KEY.
  - getMergeMinRegionSizeMb
```
public int getMergeMinRegionSizeMb()
```
    Return this instance's configured value for MERGE_MIN_REGION_SIZE_MB_KEY.
  - setMasterServices
```
public void setMasterServices(MasterServices masterServices)
```
    Set the master service.
    
    Specified by:
    
    setMasterServices in interface RegionNormalizer
    
    Parameters:
    masterServices - inject instance of MasterServices
  - computePlansForTable
```
public List<NormalizationPlan> computePlansForTable(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:
    
    computePlansForTable in interface RegionNormalizer
    
    Parameters:
    table - table to normalize
    
    Returns:
    normalization plan to execute
    
    Throws:
    
    HBaseIOException

Class SimpleRegionNormalizer

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

SimpleRegionNormalizer

Method Detail

setMasterRpcServices

getConf

setConf

isSplitEnabled

isMergeEnabled

getMinRegionCount

getMergeMinRegionAge

getMergeMinRegionSizeMb

setMasterServices

computePlansForTable