RegionReplicaUtil (Apache HBase 1.4.11 API)

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

Direct Known Subclasses:

ServerRegionReplicaUtil
```
@InterfaceAudience.Private
public class RegionReplicaUtil
extends Object
```
Utility methods which contain the logic for regions and replicas.

Field Summary

Fields
Modifier and Type	Field and Description
`protected static boolean`	`DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH`
`static String`	`REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY` Whether or not the secondary region will wait for observing a flush / region open event from the primary region via async wal replication before enabling read requests.

Constructor Summary

Constructors
Constructor and Description

RegionReplicaUtil()

Constructors
Constructor and Description
`RegionReplicaUtil()`

Method Summary

Methods
Modifier and Type	Method and Description
`static HRegionInfo`	`getRegionInfoForDefaultReplica(HRegionInfo regionInfo)` Returns the HRegionInfo for the default replicaId (0).
`static HRegionInfo`	`getRegionInfoForReplica(HRegionInfo regionInfo, int replicaId)` Returns the HRegionInfo for the given replicaId.
`static boolean`	`isDefaultReplica(HRegionInfo hri)`
`static boolean`	`isDefaultReplica(int replicaId)`
`static boolean`	`isReplicasForSameRegion(HRegionInfo regionInfoA, HRegionInfo regionInfoB)`
`static void`	`removeNonDefaultRegions(Collection<HRegionInfo> regions)` Removes the non-default replicas from the passed regions collection

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

- Field Detail
  - REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY
```
public static final String REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY
```
    Whether or not the secondary region will wait for observing a flush / region open event from the primary region via async wal replication before enabling read requests. Since replayed edits from async wal replication from primary is not persisted in WAL, the memstore of the secondary region might be non-empty at the time of close or crash. For ensuring seqId's not "going back in time" in the secondary region replica, this should be enabled. However, in some cases the above semantics might be ok for some application classes. See HBASE-11580 for more context.
    
    See Also:
    Constant Field Values
  - DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH
```
protected static final boolean DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH
```
    See Also:
    Constant Field Values
- Constructor Detail
  - RegionReplicaUtil
```
public RegionReplicaUtil()
```
- Method Detail
  - getRegionInfoForReplica
```
public static HRegionInfo getRegionInfoForReplica(HRegionInfo regionInfo,
                                  int replicaId)
```
    Returns the HRegionInfo for the given replicaId. HRegionInfo's correspond to a range of a table, but more than one "instance" of the same range can be deployed which are differentiated by the replicaId.
    
    Parameters:
    replicaId - the replicaId to use
    
    Returns:
    an HRegionInfo object corresponding to the same range (table, start and end key), but for the given replicaId.
  - getRegionInfoForDefaultReplica
```
public static HRegionInfo getRegionInfoForDefaultReplica(HRegionInfo regionInfo)
```
    Returns the HRegionInfo for the default replicaId (0). HRegionInfo's correspond to a range of a table, but more than one "instance" of the same range can be deployed which are differentiated by the replicaId.
    
    Returns:
    an HRegionInfo object corresponding to the same range (table, start and end key), but for the default replicaId.
  - isDefaultReplica
```
public static boolean isDefaultReplica(int replicaId)
```
    Returns:
    true if this replicaId corresponds to default replica for the region
  - isDefaultReplica
```
public static boolean isDefaultReplica(HRegionInfo hri)
```
    Returns:
    true if this region is a default replica for the region
  - removeNonDefaultRegions
```
public static void removeNonDefaultRegions(Collection<HRegionInfo> regions)
```
    Removes the non-default replicas from the passed regions collection
    
    Parameters:
    regions -
  - isReplicasForSameRegion
```
public static boolean isReplicasForSameRegion(HRegionInfo regionInfoA,
                              HRegionInfo regionInfoB)
```

Class RegionReplicaUtil

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH_CONF_KEY

DEFAULT_REGION_REPLICA_WAIT_FOR_PRIMARY_FLUSH

Constructor Detail

RegionReplicaUtil

Method Detail

getRegionInfoForReplica

getRegionInfoForDefaultReplica

isDefaultReplica

isDefaultReplica

removeNonDefaultRegions

isReplicasForSameRegion