FSRegionScanner (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.util.FSRegionScanner

All Implemented Interfaces:

Runnable
```
@InterfaceAudience.Private
 class FSRegionScanner
extends Object
implements Runnable
```
Thread that walks over the filesystem, and computes the mappings BestHost> and Map>

Field Summary

Fields
Modifier and Type	Field and Description
`private org.apache.hadoop.fs.FileSystem`	`fs` The file system used
`private static org.apache.commons.logging.Log`	`LOG`
`private Map<String,Map<String,Float>>`	`regionDegreeLocalityMapping` Maps region encoded names to maps of hostnames to fractional locality of that region on that host.
`private org.apache.hadoop.fs.Path`	`regionPath`
`private Map<String,String>`	`regionToBestLocalityRSMapping` Maps each region to the RS with highest locality for that region.

Constructor Summary

Constructors
Constructor and Description
`FSRegionScanner(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path regionPath, Map<String,String> regionToBestLocalityRSMapping, Map<String,Map<String,Float>> regionDegreeLocalityMapping)`

Method Summary

Methods
Modifier and Type Method and Description

void run()
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods
Modifier and Type	Method and Description
`void`	`run()`

Field Detail

LOG

private static final org.apache.commons.logging.Log LOG

regionPath

private org.apache.hadoop.fs.Path regionPath

fs

private org.apache.hadoop.fs.FileSystem fs

The file system used

regionToBestLocalityRSMapping
```
private Map<String,String> regionToBestLocalityRSMapping
```
Maps each region to the RS with highest locality for that region.

regionDegreeLocalityMapping
```
private Map<String,Map<String,Float>> regionDegreeLocalityMapping
```
Maps region encoded names to maps of hostnames to fractional locality of that region on that host.

Constructor Detail

FSRegionScanner

FSRegionScanner(org.apache.hadoop.fs.FileSystem fs,
               org.apache.hadoop.fs.Path regionPath,
               Map<String,String> regionToBestLocalityRSMapping,
               Map<String,Map<String,Float>> regionDegreeLocalityMapping)

Method Detail
- run
```
public void run()
```
  Specified by:
  
  run in interface Runnable

Class FSRegionScanner

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

regionPath

fs

regionToBestLocalityRSMapping

regionDegreeLocalityMapping

Constructor Detail

FSRegionScanner

Method Detail

run