org.apache.hadoop.hbase.master.assignment

Class RegionStateStore

java.lang.Object

org.apache.hadoop.hbase.master.assignment.RegionStateStore

@InterfaceAudience.Private
public class RegionStateStore
extends Object

Store Region State to hbase:meta table.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RegionStateStore.RegionStateVisitor

Field Summary

Fields

Modifier and Type	Field and Description
protected static char	META_REPLICA_ID_DELIMITER The delimiter for meta columns for replicaIds > 0

Constructor Summary

Constructors

Constructor and Description
RegionStateStore(MasterServices master, MasterRegion masterRegion)

Method Summary

Modifier and Type	Method and Description
void	deleteMergeQualifiers(RegionInfo mergeRegion) Deletes merge qualifiers for the specified merge region.
void	deleteRegion(RegionInfo regionInfo) Deletes the specified region.
void	deleteRegions(List<RegionInfo> regions) Deletes the specified regions.
List<RegionInfo>	getMergeRegions(RegionInfo region)
static RegionState.State	getRegionState(Result r, RegionInfo regionInfo) Pull the region state from a catalog table Result.
static byte[]	getStateColumn(int replicaId)
boolean	hasMergeRegions(RegionInfo region) Check whether the given region has any 'info:merge*' columns.
void	mergeRegions(RegionInfo child, RegionInfo[] parents, ServerName serverName, TableDescriptor htd)
void	overwriteRegions(List<RegionInfo> regionInfos, int regionReplication) Overwrites the specified regions from hbase:meta.
void	removeRegionReplicas(TableName tableName, int oldReplicaCount, int newReplicaCount)
void	splitRegion(RegionInfo parent, RegionInfo splitA, RegionInfo splitB, ServerName serverName, TableDescriptor htd) Splits the region into two in an atomic operation.
void	visitMeta(RegionStateStore.RegionStateVisitor visitor)
static void	visitMetaEntry(RegionStateStore.RegionStateVisitor visitor, Result result)
void	visitMetaForRegion(String regionEncodedName, RegionStateStore.RegionStateVisitor visitor) Queries META table for the passed region encoded name, delegating action upon results to the RegionStateVisitor passed as second parameter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

META_REPLICA_ID_DELIMITER

protected static final char META_REPLICA_ID_DELIMITER

The delimiter for meta columns for replicaIds > 0

See Also:

Constant Field Values

Constructor Detail

RegionStateStore

public RegionStateStore(MasterServices master,
                        MasterRegion masterRegion)

Method Detail

visitMeta

public void visitMeta(RegionStateStore.RegionStateVisitor visitor)
               throws IOException

Throws:

IOException

visitMetaForRegion

public void visitMetaForRegion(String regionEncodedName,
                               RegionStateStore.RegionStateVisitor visitor)
                        throws IOException

Queries META table for the passed region encoded name, delegating action upon results to the RegionStateVisitor passed as second parameter.

Parameters:

regionEncodedName - encoded name for the Region we want to query META for.

visitor - The RegionStateVisitor instance to react over the query results.

Throws:

IOException - If some error occurs while querying META or parsing results.

visitMetaEntry

public static void visitMetaEntry(RegionStateStore.RegionStateVisitor visitor,
                                  Result result)
                           throws IOException

Throws:

IOException

splitRegion

public void splitRegion(RegionInfo parent,
                        RegionInfo splitA,
                        RegionInfo splitB,
                        ServerName serverName,
                        TableDescriptor htd)
                 throws IOException

Splits the region into two in an atomic operation. Offlines the parent region with the information that it is split into two, and also adds the daughter regions. Does not add the location information to the daughter regions since they are not open yet.

Throws:

IOException

mergeRegions

public void mergeRegions(RegionInfo child,
                         RegionInfo[] parents,
                         ServerName serverName,
                         TableDescriptor htd)
                  throws IOException

Throws:

IOException

hasMergeRegions

public boolean hasMergeRegions(RegionInfo region)
                        throws IOException

Check whether the given region has any 'info:merge*' columns.

Throws:

IOException

getMergeRegions

public List<RegionInfo> getMergeRegions(RegionInfo region)
                                 throws IOException

Returns:

Return all regioninfos listed in the 'info:merge*' columns of the given region.

Throws:

IOException

deleteMergeQualifiers

public void deleteMergeQualifiers(RegionInfo mergeRegion)
                           throws IOException

Deletes merge qualifiers for the specified merge region.

Parameters:

connection - connection we're using

mergeRegion - the merged region

Throws:

IOException

deleteRegion

public void deleteRegion(RegionInfo regionInfo)
                  throws IOException

Deletes the specified region.

Throws:

IOException

deleteRegions

public void deleteRegions(List<RegionInfo> regions)
                   throws IOException

Deletes the specified regions.

Throws:

IOException

overwriteRegions

public void overwriteRegions(List<RegionInfo> regionInfos,
                             int regionReplication)
                      throws IOException

Overwrites the specified regions from hbase:meta. Deletes old rows for the given regions and adds new ones. Regions added back have state CLOSED.

Parameters:

connection - connection we're using

regionInfos - list of regions to be added to META

Throws:

IOException

removeRegionReplicas

public void removeRegionReplicas(TableName tableName,
                                 int oldReplicaCount,
                                 int newReplicaCount)
                          throws IOException

Throws:

IOException

getRegionState

public static RegionState.State getRegionState(Result r,
                                               RegionInfo regionInfo)

Pull the region state from a catalog table Result.

Returns:

the region state, or null if unknown.

getStateColumn

public static byte[] getStateColumn(int replicaId)