HDFSBlocksDistribution (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.HDFSBlocksDistribution

```
@InterfaceAudience.Private
public class HDFSBlocksDistribution
extends Object
```
Data structure to describe the distribution of HDFS blocks among hosts. Adding erroneous data will be ignored silently.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class HDFSBlocksDistribution.HostAndWeight
Stores the hostname and weight for that hostname.

Nested Classes
Modifier and Type	Class and Description
`static class`	`HDFSBlocksDistribution.HostAndWeight` Stores the hostname and weight for that hostname.

Field Summary

Fields
Modifier and Type Field and Description

private Map<String,HDFSBlocksDistribution.HostAndWeight> hostAndWeights

private long uniqueBlocksTotalWeight

Fields
Modifier and Type	Field and Description
`private Map<String,HDFSBlocksDistribution.HostAndWeight>`	`hostAndWeights`
`private long`	`uniqueBlocksTotalWeight`

Constructor Summary

Constructors
Constructor and Description

HDFSBlocksDistribution()
Constructor

Constructors
Constructor and Description
`HDFSBlocksDistribution()` Constructor

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(HDFSBlocksDistribution otherBlocksDistribution)` This will add the distribution from input to this object
`private void`	`addHostAndBlockWeight(String host, long weight)` add some weight to a specific host
`void`	`addHostsAndBlockWeight(String[] hosts, long weight)` add some weight to a list of hosts, update the value of unique block weight
`private void`	`addUniqueWeight(long weight)` add some weight to the total unique weight
`float`	`getBlockLocalityIndex(String host)` return the locality index of a given host
`Map<String,HDFSBlocksDistribution.HostAndWeight>`	`getHostAndWeights()`
`List<String>`	`getTopHosts()` return the sorted list of hosts in terms of their weights
`HDFSBlocksDistribution.HostAndWeight[]`	`getTopHostsWithWeights()` return the sorted list of hosts in terms of their weights
`long`	`getUniqueBlocksTotalWeight()`
`long`	`getWeight(String host)` return the weight for a specific host, that will be the total bytes of all blocks on the host
`String`	`toString()`

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

- Field Detail
  - hostAndWeights
```
private Map<String,HDFSBlocksDistribution.HostAndWeight> hostAndWeights
```
  - uniqueBlocksTotalWeight
```
private long uniqueBlocksTotalWeight
```
- Constructor Detail
  - HDFSBlocksDistribution
```
public HDFSBlocksDistribution()
```
    Constructor
- Method Detail
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
    
    See Also:
    Object.toString()
  - addHostsAndBlockWeight
```
public void addHostsAndBlockWeight(String[] hosts,
                          long weight)
```
    add some weight to a list of hosts, update the value of unique block weight
    
    Parameters:
    hosts - the list of the host
    weight - the weight
  - addUniqueWeight
```
private void addUniqueWeight(long weight)
```
    add some weight to the total unique weight
    
    Parameters:
    weight - the weight
  - addHostAndBlockWeight
```
private void addHostAndBlockWeight(String host,
                         long weight)
```
    add some weight to a specific host
    
    Parameters:
    host - the host name
    weight - the weight
  - getHostAndWeights
```
public Map<String,HDFSBlocksDistribution.HostAndWeight> getHostAndWeights()
```
    Returns:
    the hosts and their weights
  - getWeight
```
public long getWeight(String host)
```
    return the weight for a specific host, that will be the total bytes of all blocks on the host
    
    Parameters:
    host - the host name
    
    Returns:
    the weight of the given host
  - getUniqueBlocksTotalWeight
```
public long getUniqueBlocksTotalWeight()
```
    Returns:
    the sum of all unique blocks' weight
  - getBlockLocalityIndex
```
public float getBlockLocalityIndex(String host)
```
    return the locality index of a given host
    
    Parameters:
    host - the host name
    
    Returns:
    the locality index of the given host
  - add
```
public void add(HDFSBlocksDistribution otherBlocksDistribution)
```
    This will add the distribution from input to this object
    
    Parameters:
    otherBlocksDistribution - the other hdfs blocks distribution
  - getTopHosts
```
public List<String> getTopHosts()
```
    return the sorted list of hosts in terms of their weights
  - getTopHostsWithWeights
```
public HDFSBlocksDistribution.HostAndWeight[] getTopHostsWithWeights()
```
    return the sorted list of hosts in terms of their weights

Class HDFSBlocksDistribution

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

hostAndWeights

uniqueBlocksTotalWeight

Constructor Detail

HDFSBlocksDistribution

Method Detail

toString

addHostsAndBlockWeight

addUniqueWeight

addHostAndBlockWeight

getHostAndWeights

getWeight

getUniqueBlocksTotalWeight

getBlockLocalityIndex

add

getTopHosts

getTopHostsWithWeights