SnapshotOfRegionAssignmentFromMeta (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.master.SnapshotOfRegionAssignmentFromMeta

```
@InterfaceAudience.Private
public class SnapshotOfRegionAssignmentFromMeta
extends Object
```
Used internally for reading meta and constructing datastructures that are then queried, for things like regions to regionservers, table to regions, etc. It also records the favored nodes mapping for regions.

Field Summary

Fields
Modifier and Type	Field and Description
`private Connection`	`connection`
`private Set<TableName>`	`disabledTables`
`private boolean`	`excludeOfflinedSplitParents`
`private FavoredNodesPlan`	`existingAssignmentPlan` the existing assignment plan in the hbase:meta region
`private static org.apache.commons.logging.Log`	`LOG`
`private Map<String,HRegionInfo>`	`regionNameToRegionInfoMap` the region name to region info map
`private Map<ServerName,List<HRegionInfo>>`	`regionServerToRegionMap` the regionServer to region map
`private Map<HRegionInfo,ServerName>`	`regionToRegionServerMap` the region to region server map
`private Map<TableName,List<HRegionInfo>>`	`tableToRegionMap` the table name to region map

Constructor Summary

Constructors
Constructor and Description
`SnapshotOfRegionAssignmentFromMeta(Connection connection)`
`SnapshotOfRegionAssignmentFromMeta(Connection connection, Set<TableName> disabledTables, boolean excludeOfflinedSplitParents)`

Method Summary

Methods
Modifier and Type	Method and Description
`private void`	`addAssignment(HRegionInfo regionInfo, ServerName server)`
`private void`	`addRegion(HRegionInfo regionInfo)`
`FavoredNodesPlan`	`getExistingAssignmentPlan()` Get the favored nodes plan
`Map<String,HRegionInfo>`	`getRegionNameToRegionInfoMap()` Get the regioninfo for a region
`Map<ServerName,List<HRegionInfo>>`	`getRegionServerToRegionMap()` Get regionserver to region map
`Map<HRegionInfo,ServerName>`	`getRegionToRegionServerMap()` Get region to region server map
`Set<TableName>`	`getTableSet()` Get the table set
`Map<TableName,List<HRegionInfo>>`	`getTableToRegionMap()` Get regions for tables
`void`	`initialize()` Initialize the region assignment snapshot by scanning the hbase:meta table

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

connection
```
private final Connection connection
```

tableToRegionMap

private final Map<TableName,List<HRegionInfo>> tableToRegionMap

the table name to region map

regionToRegionServerMap

private Map<HRegionInfo,ServerName> regionToRegionServerMap

the region to region server map

regionNameToRegionInfoMap

private final Map<String,HRegionInfo> regionNameToRegionInfoMap

the region name to region info map

regionServerToRegionMap

private final Map<ServerName,List<HRegionInfo>> regionServerToRegionMap

the regionServer to region map

existingAssignmentPlan
```
private final FavoredNodesPlan existingAssignmentPlan
```
the existing assignment plan in the hbase:meta region

disabledTables

private final Set<TableName> disabledTables

excludeOfflinedSplitParents

private final boolean excludeOfflinedSplitParents

Constructor Detail

SnapshotOfRegionAssignmentFromMeta

public SnapshotOfRegionAssignmentFromMeta(Connection connection)

SnapshotOfRegionAssignmentFromMeta

public SnapshotOfRegionAssignmentFromMeta(Connection connection,
                                  Set<TableName> disabledTables,
                                  boolean excludeOfflinedSplitParents)

Method Detail
- initialize
```
public void initialize()
                throws IOException
```
  Initialize the region assignment snapshot by scanning the hbase:meta table
  
  Throws:
  
  IOException
- addRegion
```
private void addRegion(HRegionInfo regionInfo)
```
- addAssignment
```
private void addAssignment(HRegionInfo regionInfo,
                 ServerName server)
```
- getRegionNameToRegionInfoMap
```
public Map<String,HRegionInfo> getRegionNameToRegionInfoMap()
```
  Get the regioninfo for a region
  
  Returns:
  the regioninfo
- getTableToRegionMap
```
public Map<TableName,List<HRegionInfo>> getTableToRegionMap()
```
  Get regions for tables
  
  Returns:
  a mapping from table to regions
- getRegionToRegionServerMap
```
public Map<HRegionInfo,ServerName> getRegionToRegionServerMap()
```
  Get region to region server map
  
  Returns:
  region to region server map
- getRegionServerToRegionMap
```
public Map<ServerName,List<HRegionInfo>> getRegionServerToRegionMap()
```
  Get regionserver to region map
  
  Returns:
  regionserver to region map
- getExistingAssignmentPlan
```
public FavoredNodesPlan getExistingAssignmentPlan()
```
  Get the favored nodes plan
  
  Returns:
  the existing favored nodes plan
- getTableSet
```
public Set<TableName> getTableSet()
```
  Get the table set
  
  Returns:
  the table set

Class SnapshotOfRegionAssignmentFromMeta

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

connection

tableToRegionMap

regionToRegionServerMap

regionNameToRegionInfoMap

regionServerToRegionMap

existingAssignmentPlan

disabledTables

excludeOfflinedSplitParents

Constructor Detail

SnapshotOfRegionAssignmentFromMeta

SnapshotOfRegionAssignmentFromMeta

Method Detail

initialize

addRegion

addAssignment

getRegionNameToRegionInfoMap

getTableToRegionMap

getRegionToRegionServerMap

getRegionServerToRegionMap

getExistingAssignmentPlan

getTableSet