org.apache.hadoop.hbase.regionserver.wal

Class HLogKey

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.HLogKey

All Implemented Interfaces:

Comparable<HLogKey>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable<HLogKey>

@InterfaceAudience.Private
public class HLogKey
extends Object
implements org.apache.hadoop.io.WritableComparable<HLogKey>

A Key for an entry in the change log. The log intermingles edits to many tables and rows, so each log entry identifies the appropriate table and row. Within a table and row, they're also sorted.

Some Transactional edits (START, COMMIT, ABORT) will not have an associated row.

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor and Description
HLogKey()
HLogKey(byte[] encodedRegionName, TableName tablename, long logSeqNum, long now, List<UUID> clusterIds, long nonceGroup, long nonce) Create the log key for writing to somewhere.
HLogKey(byte[] encodedRegionName, TableName tablename, long logSeqNum, long now, UUID clusterId)

Method Summary

Methods

Modifier and Type	Method and Description
void	addClusterId(UUID clusterId) Marks that the cluster with the given clusterId has consumed the change
int	compareTo(HLogKey o)
boolean	equals(Object obj)
WALProtos.WALKey.Builder	getBuilder(WALCellCodec.ByteStringCompressor compressor)
List<UUID>	getClusterIds()
byte[]	getEncodedRegionName()
long	getLogSeqNum()
long	getNonce()
long	getNonceGroup()
UUID	getOriginatingClusterId()
NavigableMap<byte[],Integer>	getScopes()
TableName	getTablename()
long	getWriteTime()
int	hashCode()
protected void	init(byte[] encodedRegionName, TableName tablename, long logSeqNum, long now, List<UUID> clusterIds, long nonceGroup, long nonce)
void	readFields(DataInput in)
void	readFieldsFromPb(WALProtos.WALKey walKey, WALCellCodec.ByteStringUncompressor uncompressor)
void	readOlderScopes(NavigableMap<byte[],Integer> scopes)
void	setCompressionContext(org.apache.hadoop.hbase.regionserver.wal.CompressionContext compressionContext)
void	setScopes(NavigableMap<byte[],Integer> scopes)
String	toString()
Map<String,Object>	toStringMap() Produces a string map for this key.
void	write(DataOutput out) Deprecated.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

HLogKey

public HLogKey()

HLogKey

public HLogKey(byte[] encodedRegionName,
       TableName tablename,
       long logSeqNum,
       long now,
       UUID clusterId)

HLogKey

public HLogKey(byte[] encodedRegionName,
       TableName tablename,
       long logSeqNum,
       long now,
       List<UUID> clusterIds,
       long nonceGroup,
       long nonce)

Create the log key for writing to somewhere. We maintain the tablename mainly for debugging purposes. A regionName is always a sub-table object.

Parameters:

encodedRegionName - Encoded name of the region as returned by HRegionInfo#getEncodedNameAsBytes().

tablename - - name of table

logSeqNum - - log sequence number

now - Time at which this edit was written.

clusterIds - the clusters that have consumed the change(used in Replication)

Method Detail

init

protected void init(byte[] encodedRegionName,
        TableName tablename,
        long logSeqNum,
        long now,
        List<UUID> clusterIds,
        long nonceGroup,
        long nonce)

setCompressionContext

public void setCompressionContext(org.apache.hadoop.hbase.regionserver.wal.CompressionContext compressionContext)

Parameters:

compressionContext - Compression context to use

getEncodedRegionName

public byte[] getEncodedRegionName()

Returns:

encoded region name

getTablename

public TableName getTablename()

Returns:

table name

getLogSeqNum

public long getLogSeqNum()

Returns:

log sequence number

getWriteTime

public long getWriteTime()

Returns:

the write time

getScopes

public NavigableMap<byte[],Integer> getScopes()

getNonceGroup

public long getNonceGroup()

Returns:

The nonce group

getNonce

public long getNonce()

Returns:

The nonce

setScopes

public void setScopes(NavigableMap<byte[],Integer> scopes)

readOlderScopes

public void readOlderScopes(NavigableMap<byte[],Integer> scopes)

addClusterId

public void addClusterId(UUID clusterId)

Marks that the cluster with the given clusterId has consumed the change

getClusterIds

public List<UUID> getClusterIds()

Returns:

the set of cluster Ids that have consumed the change

getOriginatingClusterId

public UUID getOriginatingClusterId()

Returns:

the cluster id on which the change has originated. It there is no such cluster, it returns DEFAULT_CLUSTER_ID (cases where replication is not enabled)

toString

public String toString()

Overrides:

toString in class Object

toStringMap

public Map<String,Object> toStringMap()

Produces a string map for this key. Useful for programmatic use and manipulation of the data stored in an HLogKey, for example, printing as JSON.

Returns:

a Map containing data from this key

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(HLogKey o)

Specified by:

compareTo in interface Comparable<HLogKey>

write

@Deprecated
public void write(DataOutput out)
           throws IOException

Deprecated.

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

getBuilder

public WALProtos.WALKey.Builder getBuilder(WALCellCodec.ByteStringCompressor compressor)
                                    throws IOException

Throws:

IOException

readFieldsFromPb

public void readFieldsFromPb(WALProtos.WALKey walKey,
                    WALCellCodec.ByteStringUncompressor uncompressor)
                      throws IOException

Throws:

IOException