org.apache.hadoop.hbase

类 KeyValue.KeyOnlyKeyValue

java.lang.Object

org.apache.hadoop.hbase.KeyValue

org.apache.hadoop.hbase.KeyValue.KeyOnlyKeyValue

所有已实现的接口:

Cloneable, Cell, ExtendedCell, HeapSize, RawCell

封闭类:

KeyValue

public static class KeyValue.KeyOnlyKeyValue
extends KeyValue

A simple form of KeyValue that creates a keyvalue with only the key part of the byte[] Mainly used in places where we need to compare two cells. Avoids copying of bytes In places like block index keys, we need to compare the key byte[] with a cell. Hence create a Keyvalue(aka Cell) that would help in comparing as two cells

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.hbase.KeyValue

KeyValue.KeyOnlyKeyValue, KeyValue.KVComparator, KeyValue.MetaComparator, KeyValue.SamePrefixComparator<T>, KeyValue.Type

字段概要

从类继承的字段 org.apache.hadoop.hbase.KeyValue

bytes, COLUMN_FAMILY_DELIM_ARRAY, COLUMN_FAMILY_DELIMITER, COMPARATOR, FAMILY_LENGTH_SIZE, FIXED_OVERHEAD, KEY_INFRASTRUCTURE_SIZE, KEY_LENGTH_SIZE, KEYVALUE_INFRASTRUCTURE_SIZE, KEYVALUE_WITH_TAGS_INFRASTRUCTURE_SIZE, length, LOWESTKEY, META_COMPARATOR, offset, ROW_KEY_OFFSET, ROW_LENGTH_SIZE, ROW_OFFSET, TAGS_LENGTH_SIZE, TIMESTAMP_SIZE, TIMESTAMP_TYPE_SIZE, TYPE_SIZE

从接口继承的字段 org.apache.hadoop.hbase.ExtendedCell

CELL_NOT_BASED_ON_CHUNK

从接口继承的字段 org.apache.hadoop.hbase.RawCell

MAX_TAGS_LENGTH

构造器概要

构造器

构造器和说明
KeyOnlyKeyValue()
KeyOnlyKeyValue(byte[] b)
KeyOnlyKeyValue(byte[] b, int offset, int length)

方法概要

限定符和类型	方法和说明
void	clear()
boolean	equals(Object other) Needed doing 'contains' on List.
byte[]	getFamilyArray() Contiguous bytes composed of legal HDFS filename characters which may start at any index in the containing array.
byte	getFamilyLength()
int	getFamilyOffset()
byte[]	getKey() Do not use unless you have to.
int	getKeyLength()
int	getKeyOffset()
byte[]	getQualifierArray() Contiguous raw bytes that may start at any index in the containing array.
int	getQualifierLength()
int	getQualifierOffset()
byte[]	getRowArray() Contiguous raw bytes that may start at any index in the containing array.
short	getRowLength()
int	getRowOffset()
byte[]	getTagsArray() Contiguous raw bytes representing tags that may start at any index in the containing array.
int	getTagsLength() This returns the total length of the tag bytes
int	getTagsOffset() This returns the offset where the tag actually starts.
long	getTimestamp()
int	getTimestampOffset()
byte	getTypeByte()
byte[]	getValueArray() Contiguous raw bytes that may start at any index in the containing array.
int	getValueLength()
int	getValueOffset()
int	hashCode() In line with KeyValue.equals(Object), only uses the key portion, not the value.
long	heapSize() HeapSize implementation We do not count the bytes in the rowCache because it should be empty for a KeyValue in the MemStore.
void	set(KeyValue.KeyOnlyKeyValue keyOnlyKeyValue)
void	setKey(byte[] key, int offset, int length) A setter that helps to avoid object creation every time and whenever there is a need to create new KeyOnlyKeyValue.
String	toString()
int	write(OutputStream out, boolean withTags) Write this cell to an OutputStream in a KeyValue format.

从类继承的方法 org.apache.hadoop.hbase.KeyValue

clone, create, create, createKeyOnly, deepClone, getBuffer, getDelimiter, getDelimiterInReverse, getFamilyLength, getKeyDataStructureSize, getKeyString, getKeyValueDataStructureSize, getKeyValueDataStructureSize, getKeyValueDataStructureSize, getLength, getOffset, getSequenceId, getSerializedSize, humanReadableTimestamp, isLatestTimestamp, keyToString, keyToString, oswrite, setSequenceId, setTimestamp, setTimestamp, shallowCopy, toStringMap, updateLatestStamp, write, write, writeByteArray

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.hbase.ExtendedCell

getChunkId, getSerializedSize

从接口继承的方法 org.apache.hadoop.hbase.RawCell

checkForTagsLength, cloneTags, getTag, getTags

从接口继承的方法 org.apache.hadoop.hbase.Cell

getType

构造器详细资料

KeyOnlyKeyValue

public KeyOnlyKeyValue()

KeyOnlyKeyValue

public KeyOnlyKeyValue(byte[] b)

KeyOnlyKeyValue

public KeyOnlyKeyValue(byte[] b,
                       int offset,
                       int length)

方法详细资料

set

public void set(KeyValue.KeyOnlyKeyValue keyOnlyKeyValue)

clear

public void clear()

getKeyOffset

public int getKeyOffset()

覆盖:

getKeyOffset 在类中 KeyValue

返回:

Key offset in backing buffer..

setKey

public void setKey(byte[] key,
                   int offset,
                   int length)

A setter that helps to avoid object creation every time and whenever there is a need to create new KeyOnlyKeyValue.

参数:

key -

offset -

length -

getKey

public byte[] getKey()

从类复制的说明: KeyValue

Do not use unless you have to. Used internally for compacting and testing. Use KeyValue.getRowArray(), KeyValue.getFamilyArray(), KeyValue.getQualifierArray(), and KeyValue.getValueArray() if accessing a KeyValue client-side.

覆盖:

getKey 在类中 KeyValue

返回:

Copy of the key portion only.

getRowArray

public byte[] getRowArray()

从接口复制的说明: Cell

Contiguous raw bytes that may start at any index in the containing array. Max length is Short.MAX_VALUE which is 32,767 bytes.

指定者:

getRowArray 在接口中 Cell

覆盖:

getRowArray 在类中 KeyValue

返回:

the backing array of the entire KeyValue (all KeyValue fields are in a single array)

getRowOffset

public int getRowOffset()

指定者:

getRowOffset 在接口中 Cell

覆盖:

getRowOffset 在类中 KeyValue

返回:

Row offset

getFamilyArray

public byte[] getFamilyArray()

从接口复制的说明: Cell

Contiguous bytes composed of legal HDFS filename characters which may start at any index in the containing array. Max length is Byte.MAX_VALUE, which is 127 bytes.

指定者:

getFamilyArray 在接口中 Cell

覆盖:

getFamilyArray 在类中 KeyValue

返回:

the backing array of the entire KeyValue (all KeyValue fields are in a single array)

getFamilyLength

public byte getFamilyLength()

指定者:

getFamilyLength 在接口中 Cell

覆盖:

getFamilyLength 在类中 KeyValue

返回:

Family length

getFamilyOffset

public int getFamilyOffset()

指定者:

getFamilyOffset 在接口中 Cell

覆盖:

getFamilyOffset 在类中 KeyValue

返回:

Family offset

getQualifierArray

public byte[] getQualifierArray()

从接口复制的说明: Cell

Contiguous raw bytes that may start at any index in the containing array.

指定者:

getQualifierArray 在接口中 Cell

覆盖:

getQualifierArray 在类中 KeyValue

返回:

the backing array of the entire KeyValue (all KeyValue fields are in a single array)

getQualifierLength

public int getQualifierLength()

指定者:

getQualifierLength 在接口中 Cell

覆盖:

getQualifierLength 在类中 KeyValue

返回:

Qualifier length

getQualifierOffset

public int getQualifierOffset()

指定者:

getQualifierOffset 在接口中 Cell

覆盖:

getQualifierOffset 在类中 KeyValue

返回:

Qualifier offset

getKeyLength

public int getKeyLength()

覆盖:

getKeyLength 在类中 KeyValue

返回:

Length of key portion.

getRowLength

public short getRowLength()

指定者:

getRowLength 在接口中 Cell

覆盖:

getRowLength 在类中 KeyValue

返回:

Row length

getTypeByte

public byte getTypeByte()

指定者:

getTypeByte 在接口中 Cell

指定者:

getTypeByte 在接口中 ExtendedCell

覆盖:

getTypeByte 在类中 KeyValue

返回:

KeyValue.TYPE byte representation

getTimestamp

public long getTimestamp()

指定者:

getTimestamp 在接口中 Cell

覆盖:

getTimestamp 在类中 KeyValue

返回:

Timestamp

getTimestampOffset

public int getTimestampOffset()

覆盖:

getTimestampOffset 在类中 KeyValue

返回:

Timestamp offset

getTagsArray

public byte[] getTagsArray()

从接口复制的说明: ExtendedCell

Contiguous raw bytes representing tags that may start at any index in the containing array.

指定者:

getTagsArray 在接口中 Cell

指定者:

getTagsArray 在接口中 ExtendedCell

覆盖:

getTagsArray 在类中 KeyValue

返回:

the backing array of the entire KeyValue (all KeyValue fields are in a single array)

getTagsOffset

public int getTagsOffset()

从类复制的说明: KeyValue

This returns the offset where the tag actually starts.

指定者:

getTagsOffset 在接口中 Cell

指定者:

getTagsOffset 在接口中 ExtendedCell

覆盖:

getTagsOffset 在类中 KeyValue

返回:

the first offset where the tags start in the Cell

getValueArray

public byte[] getValueArray()

从接口复制的说明: Cell

Contiguous raw bytes that may start at any index in the containing array. Max length is Integer.MAX_VALUE which is 2,147,483,647 bytes.

指定者:

getValueArray 在接口中 Cell

覆盖:

getValueArray 在类中 KeyValue

返回:

the backing array of the entire KeyValue (all KeyValue fields are in a single array)

getValueOffset

public int getValueOffset()

指定者:

getValueOffset 在接口中 Cell

覆盖:

getValueOffset 在类中 KeyValue

返回:

the value offset

getValueLength

public int getValueLength()

指定者:

getValueLength 在接口中 Cell

覆盖:

getValueLength 在类中 KeyValue

返回:

Value length

getTagsLength

public int getTagsLength()

从类复制的说明: KeyValue

This returns the total length of the tag bytes

指定者:

getTagsLength 在接口中 Cell

指定者:

getTagsLength 在接口中 ExtendedCell

覆盖:

getTagsLength 在类中 KeyValue

返回:

the total length of the tags in the Cell.

toString

public String toString()

覆盖:

toString 在类中 KeyValue

hashCode

public int hashCode()

从类复制的说明: KeyValue

In line with KeyValue.equals(Object), only uses the key portion, not the value.

覆盖:

hashCode 在类中 KeyValue

equals

public boolean equals(Object other)

从类复制的说明: KeyValue

Needed doing 'contains' on List. Only compares the key portion, not the value.

覆盖:

equals 在类中 KeyValue

heapSize

public long heapSize()

从类复制的说明: KeyValue

HeapSize implementation We do not count the bytes in the rowCache because it should be empty for a KeyValue in the MemStore.

指定者:

heapSize 在接口中 HeapSize

覆盖:

heapSize 在类中 KeyValue

返回:

Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.

write

public int write(OutputStream out,
                 boolean withTags)
          throws IOException

从接口复制的说明: ExtendedCell

Write this cell to an OutputStream in a KeyValue format.
KeyValue format
<4 bytes keylength> <4 bytes valuelength> <2 bytes rowlength> <row> <1 byte columnfamilylength> <columnfamily> <columnqualifier> <8 bytes timestamp> <1 byte keytype> <value> <2 bytes tagslength> <tags>

指定者:

write 在接口中 ExtendedCell

覆盖:

write 在类中 KeyValue

参数:

out - Stream to which cell has to be written

withTags - Whether to write tags.

返回:

how many bytes are written.

抛出:

IOException