Hypertable::CellStoreScannerIntervalReadahead< IndexT > Class Template Reference

Provides ability to efficiently scan over a portion of a cell store. More...

#include <CellStoreScannerIntervalReadahead.h>

Inheritance diagram for Hypertable::CellStoreScannerIntervalReadahead< IndexT >:

Collaboration diagram for Hypertable::CellStoreScannerIntervalReadahead< IndexT >:

Public Types
typedef IndexT::iterator	IndexIteratorT

Public Member Functions
	CellStoreScannerIntervalReadahead (CellStorePtr &cellstore, IndexT *index, SerializedKey start_key, SerializedKey end_key, ScanContext *scan_ctx)
virtual	~CellStoreScannerIntervalReadahead ()
virtual void	forward ()
virtual bool	get (Key &key, ByteString &value)
Public Member Functions inherited from Hypertable::CellStoreScannerInterval
	CellStoreScannerInterval ()
virtual	~CellStoreScannerInterval ()
int64_t	get_disk_read ()

Private Member Functions
bool	fetch_next_block_readahead (bool eob=false)
	This method fetches the 'next' compressed block of key/value pairs from the underlying CellStore. More...

Private Attributes
CellStorePtr	m_cellstore
BlockInfo	m_block
Key	m_key
SerializedKey	m_end_key
ByteString	m_cur_value
BlockCompressionCodec *	m_zcodec {}
KeyDecompressor *	m_key_decompressor {}
int32_t	m_fd {-1}
int64_t	m_offset {}
int64_t	m_end_offset {}
bool	m_check_for_range_end {}
bool	m_eos {}
ScanContext *	m_scan_ctx {}
uint32_t	m_oflags {}

Additional Inherited Members
Protected Attributes inherited from Hypertable::CellStoreScannerInterval
uint64_t	m_disk_read

Detailed Description

template<typename IndexT>
class Hypertable::CellStoreScannerIntervalReadahead< IndexT >

Provides ability to efficiently scan over a portion of a cell store.

Template Parameters

IndexT

Type of block index

Definition at line 47 of file CellStoreScannerIntervalReadahead.h.

Member Typedef Documentation

template<typename IndexT >

typedef IndexT::iterator Hypertable::CellStoreScannerIntervalReadahead< IndexT >::IndexIteratorT

Definition at line 50 of file CellStoreScannerIntervalReadahead.h.

Constructor & Destructor Documentation

template<typename IndexT >

CellStoreScannerIntervalReadahead::CellStoreScannerIntervalReadahead	(	CellStorePtr &	cellstore,
		IndexT *	index,
		SerializedKey	start_key,
		SerializedKey	end_key,
		ScanContext *	scan_ctx
	)

Seek to start of range in block

End of range check

Column family check

Definition at line 50 of file CellStoreScannerIntervalReadahead.cc.

template<typename IndexT >

CellStoreScannerIntervalReadahead::~CellStoreScannerIntervalReadahead ( )

virtual

Definition at line 148 of file CellStoreScannerIntervalReadahead.cc.

Member Function Documentation

template<typename IndexT >

bool CellStoreScannerIntervalReadahead::fetch_next_block_readahead ( bool  eob = false )

private

This method fetches the 'next' compressed block of key/value pairs from the underlying CellStore.

Preconditions required to call this method:

1. m_block is cleared and m_iter points to the m_index entry of the first block to fetch 'or'
2. m_block is loaded with the current block and m_iter points to the m_index entry of the current block

Parameters

eob	true if at end of block

Returns

true if next block successfully fetched, false if no next block

Read header

take ownership of inflate buffer

Definition at line 237 of file CellStoreScannerIntervalReadahead.cc.

template<typename IndexT >

void CellStoreScannerIntervalReadahead::forward ( )

virtual

Column family check

Implements Hypertable::CellStoreScannerInterval.

Definition at line 181 of file CellStoreScannerIntervalReadahead.cc.

template<typename IndexT >

bool CellStoreScannerIntervalReadahead::get ( Key &  key, ByteString &  value  )

virtual

Implements Hypertable::CellStoreScannerInterval.

Definition at line 167 of file CellStoreScannerIntervalReadahead.cc.

Member Data Documentation

template<typename IndexT >

BlockInfo Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_block

private

Definition at line 63 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

CellStorePtr Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_cellstore

private

Definition at line 62 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

bool Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_check_for_range_end {}

private

Definition at line 72 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

ByteString Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_cur_value

private

Definition at line 66 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

SerializedKey Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_end_key

private

Definition at line 65 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

int64_t Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_end_offset {}

private

Definition at line 71 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

bool Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_eos {}

private

Definition at line 73 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

int32_t Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_fd {-1}

private

Definition at line 69 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

Key Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_key

private

Definition at line 64 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

KeyDecompressor* Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_key_decompressor {}

private

Definition at line 68 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

int64_t Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_offset {}

private

Definition at line 70 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

uint32_t Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_oflags {}

private

Definition at line 75 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

ScanContext* Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_scan_ctx {}

private

Definition at line 74 of file CellStoreScannerIntervalReadahead.h.

template<typename IndexT >

BlockCompressionCodec* Hypertable::CellStoreScannerIntervalReadahead< IndexT >::m_zcodec {}

private

Definition at line 67 of file CellStoreScannerIntervalReadahead.h.

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The documentation for this class was generated from the following files:

• /home/doug/src/hypertable/src/cc/Hypertable/RangeServer/CellStoreScannerIntervalReadahead.h
• /home/doug/src/hypertable/src/cc/Hypertable/RangeServer/CellStoreScannerIntervalReadahead.cc