org.apache.hadoop.hbase.io.hfile

类 CompoundBloomFilterWriter

java.lang.Object

org.apache.hadoop.hbase.io.hfile.CompoundBloomFilterBase

org.apache.hadoop.hbase.io.hfile.CompoundBloomFilterWriter

所有已实现的接口:

InlineBlockWriter, CellSink, ShipperListener, BloomFilterBase, BloomFilterWriter

@InterfaceAudience.Private
public class CompoundBloomFilterWriter
extends CompoundBloomFilterBase
implements BloomFilterWriter, InlineBlockWriter

Adds methods required for writing a compound Bloom filter to the data section of an HFile to the CompoundBloomFilter class.

字段概要

从类继承的字段 org.apache.hadoop.hbase.io.hfile.CompoundBloomFilterBase

comparator, errorRate, hashType, numChunks, totalByteSize, totalKeyCount, totalMaxKeys, VERSION

构造器概要

构造器

构造器和说明
CompoundBloomFilterWriter(int chunkByteSizeHint, float errorRate, int hashType, int maxFold, boolean cacheOnWrite, CellComparator comparator, BloomType bloomType)

方法概要

限定符和类型	方法和说明
void	append(Cell cell) Append the given cell
void	beforeShipped() The action that needs to be performed before Shipper.shipped() is performed
void	blockWritten(long offset, int onDiskSize, int uncompressedSize) Called after a block has been written, and its offset, raw size, and compressed size have been determined.
void	compactBloom() Compact the Bloom filter before writing metadata & data to disk.
boolean	getCacheOnWrite()
org.apache.hadoop.io.Writable	getDataWriter() Get a writable interface into bloom filter data (the actual Bloom bits).
BlockType	getInlineBlockType() The type of blocks this block writer produces.
org.apache.hadoop.io.Writable	getMetaWriter() Get a writable interface into bloom filter meta data.
Cell	getPrevCell() Returns the previous cell written by this writer
boolean	shouldWriteBlock(boolean closing) Determines whether there is a new block to be written out.
void	writeInlineBlock(DataOutput out) Writes the block to the provided stream.

从类继承的方法 org.apache.hadoop.hbase.io.hfile.CompoundBloomFilterBase

getByteSize, getKeyCount, getMaxKeys

从类继承的方法 java.lang.Object

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

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

getByteSize, getKeyCount, getMaxKeys

构造器详细资料

CompoundBloomFilterWriter

public CompoundBloomFilterWriter(int chunkByteSizeHint,
                                 float errorRate,
                                 int hashType,
                                 int maxFold,
                                 boolean cacheOnWrite,
                                 CellComparator comparator,
                                 BloomType bloomType)

参数:

chunkByteSizeHint - each chunk's size in bytes. The real chunk size might be different as required by the fold factor.

errorRate - target false positive rate

hashType - hash function type to use

maxFold - maximum degree of folding allowed

bloomType - the bloom type

方法详细资料

shouldWriteBlock

public boolean shouldWriteBlock(boolean closing)

从接口复制的说明: InlineBlockWriter

Determines whether there is a new block to be written out.

指定者:

shouldWriteBlock 在接口中 InlineBlockWriter

参数:

closing - whether the file is being closed, in which case we need to write out all available data and not wait to accumulate another block

append

public void append(Cell cell)
            throws IOException

从接口复制的说明: CellSink

Append the given cell

指定者:

append 在接口中 CellSink

参数:

cell - the cell to be added

抛出:

IOException

beforeShipped

public void beforeShipped()
                   throws IOException

从接口复制的说明: ShipperListener

The action that needs to be performed before Shipper.shipped() is performed

指定者:

beforeShipped 在接口中 ShipperListener

抛出:

IOException

getPrevCell

public Cell getPrevCell()

从接口复制的说明: BloomFilterWriter

Returns the previous cell written by this writer

指定者:

getPrevCell 在接口中 BloomFilterWriter

返回:

the previous cell

writeInlineBlock

public void writeInlineBlock(DataOutput out)
                      throws IOException

从接口复制的说明: InlineBlockWriter

Writes the block to the provided stream. Must not write any magic records. Called only if InlineBlockWriter.shouldWriteBlock(boolean) returned true.

指定者:

writeInlineBlock 在接口中 InlineBlockWriter

参数:

out - a stream (usually a compressing stream) to write the block to

抛出:

IOException

blockWritten

public void blockWritten(long offset,
                         int onDiskSize,
                         int uncompressedSize)

从接口复制的说明: InlineBlockWriter

Called after a block has been written, and its offset, raw size, and compressed size have been determined. Can be used to add an entry to a block index. If this type of inline blocks needs a block index, the inline block writer is responsible for maintaining it.

指定者:

blockWritten 在接口中 InlineBlockWriter

参数:

offset - the offset of the block in the stream

onDiskSize - the on-disk size of the block

uncompressedSize - the uncompressed size of the block

getInlineBlockType

public BlockType getInlineBlockType()

从接口复制的说明: InlineBlockWriter

The type of blocks this block writer produces.

指定者:

getInlineBlockType 在接口中 InlineBlockWriter

compactBloom

public void compactBloom()

从接口复制的说明: BloomFilterWriter

Compact the Bloom filter before writing metadata & data to disk.

指定者:

compactBloom 在接口中 BloomFilterWriter

getMetaWriter

public org.apache.hadoop.io.Writable getMetaWriter()

从接口复制的说明: BloomFilterWriter

Get a writable interface into bloom filter meta data.

指定者:

getMetaWriter 在接口中 BloomFilterWriter

返回:

a writable instance that can be later written to a stream

getDataWriter

public org.apache.hadoop.io.Writable getDataWriter()

从接口复制的说明: BloomFilterWriter

Get a writable interface into bloom filter data (the actual Bloom bits). Not used for compound Bloom filters.

指定者:

getDataWriter 在接口中 BloomFilterWriter

返回:

a writable instance that can be later written to a stream

getCacheOnWrite

public boolean getCacheOnWrite()

指定者:

getCacheOnWrite 在接口中 InlineBlockWriter

返回:

true if inline blocks produced by this writer should be cached