MetaCache (Apache HBase 1.4.11 API)

java.lang.Object
- org.apache.hadoop.hbase.client.MetaCache

@InterfaceAudience.Private
public class MetaCache
extends Object

A cache implementation for region locations from meta.

Constructor Summary

Constructors
Constructor and Description

MetaCache(MetricsConnection metrics)

Constructors
Constructor and Description
`MetaCache(MetricsConnection metrics)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`cacheLocation(TableName tableName, RegionLocations locations)` Put a newly discovered HRegionLocation into the cache.
`void`	`cacheLocation(TableName tableName, ServerName source, HRegionLocation location)` Put a newly discovered HRegionLocation into the cache.
`void`	`clearCache()` Delete all cached entries.
`void`	`clearCache(HRegionInfo hri)` Deletes the cached location of the region if necessary, based on some error from source.
`void`	`clearCache(HRegionLocation location)`
`void`	`clearCache(ServerName serverName)` Delete all cached entries of a server.
`void`	`clearCache(TableName tableName)` Delete all cached entries of a table.
`void`	`clearCache(TableName tableName, byte[] row)` Delete a cached location, no matter what it is.
`void`	`clearCache(TableName tableName, byte[] row, int replicaId)` Delete a cached location with specific replicaId.
`void`	`clearCache(TableName tableName, byte[] row, ServerName serverName)` Delete a cached location for a table, row and server
`RegionLocations`	`getCachedLocation(TableName tableName, byte[] row)` Search the cache for a location that fits our table and row key.
`int`	`getNumberOfCachedRegionLocations(TableName tableName)` Return the number of cached region for a table.
`boolean`	`isRegionCached(TableName tableName, byte[] row)` Check the region cache to see whether a region is cached yet or not.

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

- Constructor Detail
  - MetaCache
```
public MetaCache(MetricsConnection metrics)
```
- Method Detail
  - getCachedLocation
```
public RegionLocations getCachedLocation(TableName tableName,
                                byte[] row)
```
    Search the cache for a location that fits our table and row key. Return null if no suitable region is located.
    
    Returns:
    Null or region location found in cache.
  - cacheLocation
```
public void cacheLocation(TableName tableName,
                 ServerName source,
                 HRegionLocation location)
```
    Put a newly discovered HRegionLocation into the cache.
    
    Parameters:
    tableName - The table name.
    source - the source of the new location
    location - the new location
  - cacheLocation
```
public void cacheLocation(TableName tableName,
                 RegionLocations locations)
```
    Put a newly discovered HRegionLocation into the cache.
    
    Parameters:
    tableName - The table name.
    locations - the new locations
  - isRegionCached
```
public boolean isRegionCached(TableName tableName,
                     byte[] row)
```
    Check the region cache to see whether a region is cached yet or not.
    
    Parameters:
    tableName - tableName
    row - row
    
    Returns:
    Region cached or not.
  - getNumberOfCachedRegionLocations
```
public int getNumberOfCachedRegionLocations(TableName tableName)
```
    Return the number of cached region for a table. It will only be called from a unit test.
  - clearCache
```
public void clearCache()
```
    Delete all cached entries.
  - clearCache
```
public void clearCache(ServerName serverName)
```
    Delete all cached entries of a server.
  - clearCache
```
public void clearCache(TableName tableName)
```
    Delete all cached entries of a table.
  - clearCache
```
public void clearCache(TableName tableName,
              byte[] row)
```
    Delete a cached location, no matter what it is. Called when we were told to not use cache.
    
    Parameters:
    tableName - tableName
    row -
  - clearCache
```
public void clearCache(TableName tableName,
              byte[] row,
              int replicaId)
```
    Delete a cached location with specific replicaId.
    
    Parameters:
    tableName - tableName
    row - row key
    replicaId - region replica id
  - clearCache
```
public void clearCache(TableName tableName,
              byte[] row,
              ServerName serverName)
```
    Delete a cached location for a table, row and server
  - clearCache
```
public void clearCache(HRegionInfo hri)
```
    Deletes the cached location of the region if necessary, based on some error from source.
    
    Parameters:
    hri - The region in question.
  - clearCache
```
public void clearCache(HRegionLocation location)
```

Class MetaCache

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

MetaCache

Method Detail

getCachedLocation

cacheLocation

cacheLocation

isRegionCached

getNumberOfCachedRegionLocations

clearCache

clearCache

clearCache

clearCache

clearCache

clearCache

clearCache

clearCache