org.apache.hadoop.hbase

类 SizeCachedKeyValue

java.lang.Object

org.apache.hadoop.hbase.KeyValue

org.apache.hadoop.hbase.SizeCachedKeyValue

所有已实现的接口:

Cloneable, Cell, ExtendedCell, HeapSize, RawCell

直接已知子类:

SizeCachedNoTagsKeyValue

@InterfaceAudience.Private
public class SizeCachedKeyValue
extends KeyValue

This class is an extension to KeyValue where rowLen and keyLen are cached. Parsing the backing byte[] every time to get these values will affect the performance. In read path, we tend to read these values many times in Comparator, SQM etc. Note: Please do not use these objects in write path as it will increase the heap space usage. See https://issues.apache.org/jira/browse/HBASE-13448

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, 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
SizeCachedKeyValue(byte[] bytes, int offset, int length, long seqId)

方法概要

限定符和类型	方法和说明
int	getKeyLength()
short	getRowLength()
int	getSerializedSize() Override by just returning the length for saving cost of method dispatching.
long	heapSize() HeapSize implementation We do not count the bytes in the rowCache because it should be empty for a KeyValue in the MemStore.

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

clone, create, create, createKeyOnly, deepClone, equals, getBuffer, getDelimiter, getDelimiterInReverse, getFamilyArray, getFamilyLength, getFamilyLength, getFamilyOffset, getKey, getKeyDataStructureSize, getKeyOffset, getKeyString, getKeyValueDataStructureSize, getKeyValueDataStructureSize, getKeyValueDataStructureSize, getLength, getOffset, getQualifierArray, getQualifierLength, getQualifierOffset, getRowArray, getRowOffset, getSequenceId, getSerializedSize, getTagsArray, getTagsLength, getTagsOffset, getTimestamp, getTimestampOffset, getTypeByte, getValueArray, getValueLength, getValueOffset, hashCode, humanReadableTimestamp, isLatestTimestamp, keyToString, keyToString, oswrite, setSequenceId, setTimestamp, setTimestamp, shallowCopy, toString, toStringMap, updateLatestStamp, write, 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

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

SizeCachedKeyValue

public SizeCachedKeyValue(byte[] bytes,
                          int offset,
                          int length,
                          long seqId)

方法详细资料

getRowLength

public short getRowLength()

指定者:

getRowLength 在接口中 Cell

覆盖:

getRowLength 在类中 KeyValue

返回:

Row length

getKeyLength

public int getKeyLength()

覆盖:

getKeyLength 在类中 KeyValue

返回:

Length of key portion.

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.

getSerializedSize

public int getSerializedSize()

Override by just returning the length for saving cost of method dispatching. If not, it will call ExtendedCell.getSerializedSize() firstly, then forward to KeyValue.getSerializedSize(boolean). (See HBASE-21657)

指定者:

getSerializedSize 在接口中 Cell

指定者:

getSerializedSize 在接口中 ExtendedCell

覆盖:

getSerializedSize 在类中 KeyValue

返回:

Serialized size (defaults to include tag length).