org.apache.hadoop.hbase.io.hfile

类 HFileBlockIndex

java.lang.Object

org.apache.hadoop.hbase.io.hfile.HFileBlockIndex

@InterfaceAudience.Private
public class HFileBlockIndex
extends Object

Provides functionality to write (HFileBlockIndex.BlockIndexWriter) and read BlockIndexReader single-level and multi-level block indexes. Examples of how to use the block index writer can be found in CompoundBloomFilterWriter and HFileWriterV2. Examples of how to use the reader can be found in HFileReaderV2 and TestHFileBlockIndex.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	HFileBlockIndex.BlockIndexReader The reader will always hold the root level index in the memory.
static class	HFileBlockIndex.BlockIndexWriter Writes the block index into the output stream.

字段概要

字段

限定符和类型	字段和说明
static String	MAX_CHUNK_SIZE_KEY The maximum size guideline for index blocks (both leaf, intermediate, and root).
static String	MIN_INDEX_NUM_ENTRIES_KEY Minimum number of entries in a single index block.

构造器概要

构造器

构造器和说明
HFileBlockIndex()

方法概要

方法

限定符和类型	方法和说明
static int	getMaxChunkSize(org.apache.hadoop.conf.Configuration conf)
static int	getMinIndexNumEntries(org.apache.hadoop.conf.Configuration conf)

从类继承的方法 java.lang.Object

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

字段详细资料

MAX_CHUNK_SIZE_KEY

public static final String MAX_CHUNK_SIZE_KEY

The maximum size guideline for index blocks (both leaf, intermediate, and root). If not specified, DEFAULT_MAX_CHUNK_SIZE is used.

另请参阅:

常量字段值

MIN_INDEX_NUM_ENTRIES_KEY

public static final String MIN_INDEX_NUM_ENTRIES_KEY

Minimum number of entries in a single index block. Even if we are above the hfile.index.block.max.size we will keep writing to the same block unless we have that many entries. We should have at least a few entries so that we don't have too many levels in the multi-level index. This should be at least 2 to make sure there is no infinite recursion.

另请参阅:

常量字段值

构造器详细资料

HFileBlockIndex

public HFileBlockIndex()

方法详细资料

getMaxChunkSize

public static int getMaxChunkSize(org.apache.hadoop.conf.Configuration conf)

getMinIndexNumEntries

public static int getMinIndexNumEntries(org.apache.hadoop.conf.Configuration conf)