org.apache.hadoop.hbase.util

Class FSRegionScanner

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 Region -> BestHost and Region -> Map<HostName, fractional-locality-of-region>

Field Summary

Fields

Modifier and Type	Field and Description
private org.apache.hadoop.fs.FileSystem	fs The file system used
private static org.slf4j.Logger	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

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

regionPath

private org.apache.hadoop.fs.Path regionPath

fs

private org.apache.hadoop.fs.FileSystem fs

The file system used

regionToBestLocalityRSMapping

private final 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