Represents an SSTable (Sorted String Table) in the LSM-Tree. 更多...

#include <ob_sstable.h>

类 oceanbase::ObSSTable 继承关系图:

Public 成员函数
	ObSSTable (uint32_t sst_id, const string &file_name, const ObComparator comparator, ObLRUCache< uint64_t, shared_ptr< ObBlock > > block_cache)
	Constructor for ObSSTable. 更多...

void	init ()
	Initializes the SSTable instance. 更多...

uint32_t	sst_id () const

shared_ptr< ObSSTable >	get_shared_ptr ()

ObLsmIterator *	new_iterator ()

shared_ptr< ObBlock >	read_block_with_cache (uint32_t block_idx) const
	Reads a block from the SSTable using the block cache. 更多...

shared_ptr< ObBlock >	read_block (uint32_t block_idx) const
	Reads a block directly from the SSTable file. 更多...

uint32_t	block_count () const

uint32_t	size () const

const BlockMeta	block_meta (int i) const

const ObComparator *	comparator () const

void	remove ()

string	first_key () const

string	last_key () const

Private 属性
uint32_t	sst_id_

string	file_name_

const ObComparator *	comparator_ = nullptr

unique_ptr< ObFileReader >	file_reader_

vector< BlockMeta >	block_metas_

ObLRUCache< uint64_t, shared_ptr< ObBlock > > *	block_cache_

详细描述

Represents an SSTable (Sorted String Table) in the LSM-Tree.

The ObSSTable class is responsible for managing on-disk sorted string tables (SSTables). It provides methods for initialization, key-value lookups, block reading (with caching support), and creating iterators for traversal. Each SSTable is uniquely identified by an sst_id_ and interacts with the LRU cache for efficient block access.

构造及析构函数说明

◆ ObSSTable()

oceanbase::ObSSTable::ObSSTable	(	uint32_t	sst_id,
		const string &	file_name,
		const ObComparator *	comparator,
		ObLRUCache< uint64_t, shared_ptr< ObBlock > > *	block_cache
	)

inline

Constructor for ObSSTable.

Initializes an SSTable with its unique ID, file name, comparator, and block cache.

参数

sst_id	A unique identifier for the SSTable.
file_name	The name of the file storing the SSTable data.
comparator	A pointer to the comparator used for key comparison.
block_cache	A pointer to the LRU block cache for caching block-level data.

成员函数说明

◆ init()

void oceanbase::ObSSTable::init ( )

Initializes the SSTable instance.

This function is responsible for performing setup tasks required for the SSTable, such as preparing file readers or pre-loading block_metas_.

警告: This function must be called before performing any operations on the SSTable.

◆ read_block()

shared_ptr< ObBlock > oceanbase::ObSSTable::read_block ( uint32_t block_idx ) const

Reads a block directly from the SSTable file.

This function bypasses the block cache and directly reads the requested block from the SSTable file.

参数

block_idx The index of the block to read.

返回: shared_ptr<ObBlock> A shared pointer to the requested block.

◆ read_block_with_cache()

shared_ptr< ObBlock > oceanbase::ObSSTable::read_block_with_cache ( uint32_t block_idx ) const

Reads a block from the SSTable using the block cache.

Attempts to read the specified block using the block cache. If the block is not in the cache, it will load the block from the SSTable file and update the cache.

参数

block_idx The index of the block to read.

返回: shared_ptr<ObBlock> A shared pointer to the requested block.

该类的文档由以下文件生成:

src/oblsm/table/ob_sstable.h
src/oblsm/table/ob_sstable.cpp

Public 成员函数

Private 属性

详细描述

构造及析构函数说明

◆ ObSSTable()

成员函数说明

◆ init()

◆ read_block()

◆ read_block_with_cache()