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docstore.cpp
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docstore.cpp
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//
// Copyright (c) 2017-2023, Manticore Software LTD (https://manticoresearch.com)
// All rights reserved
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License. You should have
// received a copy of the GPL license along with this program; if you
// did not, you can find it at http://www.gnu.org/
//
#include "docstore.h"
#include "std/lrucache.h"
#include "fileio.h"
#include "memio.h"
#include "fileutils.h"
#include "attribute.h"
#include "indexcheck.h"
#include "lz4/lz4.h"
#include "lz4/lz4hc.h"
#include "sphinxint.h"
#include "exprtraits.h"
enum BlockFlags_e : BYTE
{
BLOCK_FLAG_COMPRESSED = 1 << 0,
BLOCK_FLAG_FIELD_REORDER = 1 << 1
};
enum BlockType_e : BYTE
{
BLOCK_TYPE_SMALL,
BLOCK_TYPE_BIG,
BLOCK_TYPE_TOTAL
};
enum DocFlags_e : BYTE
{
DOC_FLAG_ALL_EMPTY = 1 << 0,
DOC_FLAG_EMPTY_BITMASK = 1 << 1
};
enum FieldFlags_e : BYTE
{
FIELD_FLAG_COMPRESSED = 1 << 0,
FIELD_FLAG_EMPTY = 1 << 1
};
static const int STORAGE_VERSION = 1;
//////////////////////////////////////////////////////////////////////////
static BYTE Compression2Byte ( Compression_e eComp )
{
switch (eComp)
{
case Compression_e::NONE: return 0;
case Compression_e::LZ4: return 1;
case Compression_e::LZ4HC: return 2;
default:
assert ( 0 && "Unknown compression type" );
return 0;
}
}
static Compression_e Byte2Compression ( BYTE uComp )
{
switch (uComp)
{
case 0: return Compression_e::NONE;
case 1: return Compression_e::LZ4;
case 2: return Compression_e::LZ4HC;
default:
assert ( 0 && "Unknown compression type" );
return Compression_e::NONE;
}
}
static void PackData ( CSphVector<BYTE> & dDst, const BYTE * pData, DWORD uSize, bool bText, bool bPack )
{
if ( bPack )
{
const DWORD GAP = 8;
dDst.Resize ( uSize+GAP );
dDst.Resize ( sphPackPtrAttr ( dDst.Begin (), {pData, uSize} ));
}
else
{
dDst.Resize ( uSize + ( bText ? 1 : 0 ) );
memcpy ( dDst.Begin(), pData, uSize );
if ( bText )
{
dDst[uSize] = '\0';
dDst.Resize(uSize);
}
}
}
//////////////////////////////////////////////////////////////////////////
class Compressor_i
{
public:
virtual ~Compressor_i(){}
virtual bool Compress ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const = 0;
virtual bool Decompress ( const VecTraits_T<BYTE> & dCompressed, VecTraits_T<BYTE> & dDecompressed ) const = 0;
};
class Compressor_None_c : public Compressor_i
{
public:
bool Compress ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const final { return false; }
bool Decompress ( const VecTraits_T<BYTE> & dCompressed, VecTraits_T<BYTE> & dDecompressed ) const final { return true; }
};
class Compressor_LZ4_c : public Compressor_i
{
public:
bool Compress ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const override;
bool Decompress ( const VecTraits_T<BYTE> & dCompressed, VecTraits_T<BYTE> & dDecompressed ) const final;
protected:
virtual int DoCompression ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const;
};
class Compressor_LZ4HC_c : public Compressor_LZ4_c
{
public:
Compressor_LZ4HC_c ( int iCompressionLevel );
protected:
int DoCompression ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const final;
private:
int m_iCompressionLevel = DEFAULT_COMPRESSION_LEVEL;
};
bool Compressor_LZ4_c::Compress ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const
{
const int MIN_COMPRESSIBLE_SIZE = 64;
if ( dUncompressed.GetLength() < MIN_COMPRESSIBLE_SIZE )
return false;
dCompressed.Resize ( int ( dUncompressed.GetLength()*1.5f ) );
int iCompressedSize = DoCompression ( dUncompressed, dCompressed );
const float WORST_COMPRESSION_RATIO = 0.95f;
if ( iCompressedSize<0 || float(iCompressedSize)/dUncompressed.GetLength() > WORST_COMPRESSION_RATIO )
return false;
dCompressed.Resize(iCompressedSize);
return true;
}
bool Compressor_LZ4_c::Decompress ( const VecTraits_T<BYTE> & dCompressed, VecTraits_T<BYTE> & dDecompressed ) const
{
int iRes = LZ4_decompress_safe ( (const char *)dCompressed.Begin(), (char *)dDecompressed.Begin(), dCompressed.GetLength(), dDecompressed.GetLength() );
return iRes==dDecompressed.GetLength();
}
int Compressor_LZ4_c::DoCompression ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const
{
return LZ4_compress_default ( (const char *)dUncompressed.Begin(), (char *)dCompressed.Begin(), dUncompressed.GetLength(), dCompressed.GetLength() );
}
Compressor_LZ4HC_c::Compressor_LZ4HC_c ( int iCompressionLevel )
: m_iCompressionLevel ( iCompressionLevel )
{}
int Compressor_LZ4HC_c::DoCompression ( const VecTraits_T<BYTE> & dUncompressed, CSphVector<BYTE> & dCompressed ) const
{
return LZ4_compress_HC ( (const char *)dUncompressed.Begin(), (char *)dCompressed.Begin(), dUncompressed.GetLength(), dCompressed.GetLength(), m_iCompressionLevel );
}
std::unique_ptr<Compressor_i> CreateCompressor ( Compression_e eComp, int iCompressionLevel )
{
switch ( eComp )
{
case Compression_e::LZ4: return std::make_unique<Compressor_LZ4_c>();
case Compression_e::LZ4HC: return std::make_unique<Compressor_LZ4HC_c> ( iCompressionLevel );
default: return std::make_unique<Compressor_None_c>();
}
}
//////////////////////////////////////////////////////////////////////////
static CSphString BuildCompoundName ( const CSphString & sName, DocstoreDataType_e eType )
{
CSphString sCompound;
sCompound.SetSprintf ( "%d%s", eType, sName.cstr() );
return sCompound;
}
class DocstoreFields_c : public DocstoreFields_i
{
public:
struct Field_t
{
CSphString m_sName;
DocstoreDataType_e m_eType;
};
int AddField ( const CSphString & sName, DocstoreDataType_e eType ) final;
void RemoveField ( const CSphString & sName, DocstoreDataType_e eType ) final;
int GetFieldId ( const CSphString & sName, DocstoreDataType_e eType ) const final;
int GetNumFields() const final { return m_dFields.GetLength(); }
const Field_t & GetField ( int iField ) const { return m_dFields[iField]; }
void Load ( CSphReader & tReader );
void Save ( CSphWriter & tWriter );
private:
CSphVector<Field_t> m_dFields;
SmallStringHash_T<int> m_hFields;
};
int DocstoreFields_c::AddField ( const CSphString & sName, DocstoreDataType_e eType )
{
int iField = m_dFields.GetLength();
m_dFields.Add ( {sName, eType} );
m_hFields.Add ( iField, BuildCompoundName ( sName, eType ) );
return iField;
}
void DocstoreFields_c::RemoveField ( const CSphString & sName, DocstoreDataType_e eType )
{
int iFieldId = GetFieldId ( sName, eType );
if ( iFieldId==-1 )
return;
m_dFields.Remove ( iFieldId, 1 );
m_hFields.Reset();
ARRAY_FOREACH ( i, m_dFields )
m_hFields.Add ( i, BuildCompoundName ( m_dFields[i].m_sName, m_dFields[i].m_eType ) );
}
int DocstoreFields_c::GetFieldId ( const CSphString & sName, DocstoreDataType_e eType ) const
{
int * pField = m_hFields ( BuildCompoundName ( sName, eType ) );
return pField ? *pField : -1;
}
void DocstoreFields_c::Load ( CSphReader & tReader )
{
assert ( !GetNumFields() );
DWORD uNumFields = tReader.GetDword();
for ( int i = 0; i < (int)uNumFields; i++ )
{
auto eType = (DocstoreDataType_e)tReader.GetByte();
CSphString sName = tReader.GetString();
AddField ( sName, eType );
}
}
void DocstoreFields_c::Save ( CSphWriter & tWriter )
{
tWriter.PutDword ( GetNumFields() );
for ( int i = 0, iNumFields = GetNumFields(); i < iNumFields; ++i )
{
tWriter.PutByte ( GetField(i).m_eType );
tWriter.PutString ( GetField(i).m_sName );
}
}
//////////////////////////////////////////////////////////////////////////
struct BlockData_t
{
BYTE m_uFlags = 0;
DWORD m_uNumDocs = 0;
BYTE * m_pData = nullptr;
DWORD m_uSize = 0;
};
struct HashKey_t
{
int64_t m_iIndexId;
SphOffset_t m_tOffset;
bool operator == ( const HashKey_t & tKey ) const { return m_iIndexId==tKey.m_iIndexId && m_tOffset==tKey.m_tOffset; }
};
struct BlockUtil_t
{
static DWORD GetHash ( const HashKey_t & tKey )
{
DWORD uCRC32 = sphCRC32 ( &tKey.m_iIndexId, sizeof(tKey.m_iIndexId) );
return sphCRC32 ( &tKey.m_tOffset, sizeof(tKey.m_tOffset), uCRC32 );
}
static DWORD GetSize ( const BlockData_t & tValue ) { return tValue.m_uSize; }
static void Reset ( BlockData_t & tValue ) { SafeDeleteArray ( tValue.m_pData ); }
};
class BlockCache_c : public LRUCache_T<HashKey_t, BlockData_t, BlockUtil_t>
{
using BASE = LRUCache_T<HashKey_t, BlockData_t, BlockUtil_t>;
using BASE::BASE;
public:
void DeleteAll ( int64_t iIndexId ) { BASE::Delete ( [iIndexId]( const HashKey_t & tKey ){ return tKey.m_iIndexId==iIndexId; } ); }
static void Init ( int64_t iCacheSize );
static void Done() { SafeDelete(m_pBlockCache); }
static BlockCache_c * Get() { return m_pBlockCache; }
private:
static BlockCache_c * m_pBlockCache;
};
BlockCache_c * BlockCache_c::m_pBlockCache = nullptr;
void BlockCache_c::Init ( int64_t iCacheSize )
{
assert ( !m_pBlockCache );
if ( iCacheSize > 0 )
m_pBlockCache = new BlockCache_c(iCacheSize);
}
//////////////////////////////////////////////////////////////////////////
class DocstoreReaders_c
{
public:
~DocstoreReaders_c();
void CreateReader ( int64_t iSessionId, int64_t iIndexId, const CSphAutofile & tFile, DWORD uBlockSize );
CSphReader * GetReader ( int64_t iSessionId, int64_t iIndexId );
void DeleteBySessionId ( int64_t iSessionId );
void DeleteByIndexId ( int64_t iIndexId );
static void Init();
static void Done();
static DocstoreReaders_c * Get();
private:
struct HashKey_t
{
int64_t m_iSessionId;
int64_t m_iIndexId;
bool operator == ( const HashKey_t & tKey ) const;
static DWORD Hash ( const HashKey_t & tKey );
};
int m_iTotalReaderSize = 0;
CSphMutex m_tLock;
CSphOrderedHash<CSphReader *, HashKey_t, HashKey_t, 1024> m_tHash;
static DocstoreReaders_c * m_pReaders;
static const int MIN_READER_CACHE_SIZE = 262144;
static const int MAX_READER_CACHE_SIZE = 1048576;
static const int MAX_TOTAL_READER_SIZE = 8388608;
void Delete ( CSphReader * pReader, const HashKey_t tKey );
};
DocstoreReaders_c * DocstoreReaders_c::m_pReaders = nullptr;
bool DocstoreReaders_c::HashKey_t::operator == ( const HashKey_t & tKey ) const
{
return m_iSessionId==tKey.m_iSessionId && m_iIndexId==tKey.m_iIndexId;
}
DWORD DocstoreReaders_c::HashKey_t::Hash ( const HashKey_t & tKey )
{
DWORD uCRC32 = sphCRC32 ( &tKey.m_iSessionId, sizeof(tKey.m_iSessionId) );
return sphCRC32 ( &tKey.m_iIndexId, sizeof(tKey.m_iIndexId), uCRC32 );
}
DocstoreReaders_c::~DocstoreReaders_c()
{
for ( auto & tDocstore : m_tHash )
SafeDelete ( tDocstore.second );
}
void DocstoreReaders_c::CreateReader ( int64_t iSessionId, int64_t iIndexId, const CSphAutofile & tFile, DWORD uBlockSize )
{
ScopedMutex_t tLock(m_tLock);
if ( m_tHash ( { iSessionId, iIndexId } ) )
return;
int iBufferSize = (int)uBlockSize*8;
iBufferSize = Min ( iBufferSize, MAX_READER_CACHE_SIZE );
iBufferSize = Max ( iBufferSize, MIN_READER_CACHE_SIZE );
if ( iBufferSize<=(int)uBlockSize )
return;
if ( m_iTotalReaderSize+iBufferSize > MAX_TOTAL_READER_SIZE )
return;
CSphReader * pReader = new CSphReader ( nullptr, iBufferSize );
pReader->SetFile(tFile);
Verify ( m_tHash.Add ( pReader, {iSessionId, iIndexId} ) );
m_iTotalReaderSize += iBufferSize;
}
CSphReader * DocstoreReaders_c::GetReader ( int64_t iSessionId, int64_t iIndexId )
{
ScopedMutex_t tLock(m_tLock);
CSphReader ** ppReader = m_tHash ( { iSessionId, iIndexId } );
return ppReader ? *ppReader : nullptr;
}
void DocstoreReaders_c::Delete ( CSphReader * pReader, const HashKey_t tKey )
{
m_iTotalReaderSize -= pReader->GetBufferSize();
assert ( m_iTotalReaderSize>=0 );
SafeDelete(pReader);
m_tHash.Delete(tKey);
}
void DocstoreReaders_c::DeleteBySessionId ( int64_t iSessionId )
{
ScopedMutex_t tLock(m_tLock);
// fixme: create a separate (faster) lookup?
CSphVector<std::pair<CSphReader*,HashKey_t>> dToDelete;
for ( auto & tDocstore : m_tHash )
if ( tDocstore.first.m_iSessionId==iSessionId )
dToDelete.Add ( { tDocstore.second, tDocstore.first } );
for ( const auto & i : dToDelete )
Delete ( i.first, i.second );
}
void DocstoreReaders_c::DeleteByIndexId ( int64_t iIndexId )
{
ScopedMutex_t tLock(m_tLock);
// fixme: create a separate (faster) lookup?
CSphVector<std::pair<CSphReader*,HashKey_t>> dToDelete;
for ( auto& tDocstore : m_tHash )
if ( tDocstore.first.m_iIndexId==iIndexId )
dToDelete.Add ( { tDocstore.second, tDocstore.first } );
for ( const auto & i : dToDelete )
Delete ( i.first, i.second );
}
void DocstoreReaders_c::Init ()
{
assert(!m_pReaders);
m_pReaders = new DocstoreReaders_c;
}
void DocstoreReaders_c::Done()
{
SafeDelete(m_pReaders);
}
DocstoreReaders_c * DocstoreReaders_c::Get()
{
return m_pReaders;
}
//////////////////////////////////////////////////////////////////////////
static void CreateFieldRemap ( VecTraits_T<int> & dFieldInRset, const VecTraits_T<int> * pFieldIds )
{
if ( pFieldIds )
ARRAY_CONSTFOREACH ( i, dFieldInRset )
{
int * pFound = pFieldIds->BinarySearch(i);
dFieldInRset[i] = pFound ? pFieldIds->Idx ( pFound ) : -1;
}
else
ARRAY_CONSTFOREACH ( i, dFieldInRset )
dFieldInRset[i] = i;
}
//////////////////////////////////////////////////////////////////////////
class Docstore_c : public Docstore_i, public DocstoreSettings_t
{
friend class DocstoreChecker_c;
public:
Docstore_c ( int64_t iIndexId, const CSphString & sFilename );
~Docstore_c() override;
bool Init ( CSphString & sError );
int GetFieldId ( const CSphString & sName, DocstoreDataType_e eType ) const final;
void CreateReader ( int64_t iSessionId ) const final;
DocstoreDoc_t GetDoc ( RowID_t tRowID, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const final;
DocstoreSettings_t GetDocstoreSettings() const final;
private:
struct Block_t
{
SphOffset_t m_tOffset = 0;
DWORD m_uSize = 0;
DWORD m_uHeaderSize = 0;
RowID_t m_tRowID = INVALID_ROWID;
BlockType_e m_eType = BLOCK_TYPE_SMALL;
};
struct FieldInfo_t
{
BYTE m_uFlags = 0;
DWORD m_uCompressedLen = 0;
DWORD m_uUncompressedLen = 0;
};
int64_t m_iIndexId = 0;
CSphString m_sFilename;
CSphAutofile m_tFile;
CSphFixedVector<Block_t> m_dBlocks{0};
std::unique_ptr<Compressor_i> m_pCompressor;
DocstoreFields_c m_tFields;
const Block_t * FindBlock ( RowID_t tRowID ) const;
void ReadFromFile ( BYTE * pData, int iLength, SphOffset_t tOffset, int64_t iSessionId ) const;
DocstoreDoc_t ReadDocFromSmallBlock ( const Block_t & tBlock, RowID_t tRowID, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const;
DocstoreDoc_t ReadDocFromBigBlock ( const Block_t & tBlock, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const;
BlockData_t UncompressSmallBlock ( const Block_t & tBlock, int64_t iSessionId ) const;
BlockData_t UncompressBigBlockField ( SphOffset_t tOffset, const FieldInfo_t & tInfo, int64_t iSessionId ) const;
bool ProcessSmallBlockDoc ( RowID_t tCurDocRowID, RowID_t tRowID, const VecTraits_T<int> * pFieldIds, const CSphFixedVector<int> & dFieldInRset, bool bPack, MemoryReader2_c & tReader, CSphBitvec & tEmptyFields, DocstoreDoc_t & tResult ) const;
void ProcessBigBlockField ( int iField, const FieldInfo_t & tInfo, int iFieldInRset, bool bPack, int64_t iSessionId, SphOffset_t & tOffset, DocstoreDoc_t & tResult ) const;
};
Docstore_c::Docstore_c ( int64_t iIndexId, const CSphString & sFilename )
: m_iIndexId ( iIndexId )
, m_sFilename ( sFilename )
{}
Docstore_c::~Docstore_c ()
{
BlockCache_c * pBlockCache = BlockCache_c::Get();
if ( pBlockCache )
pBlockCache->DeleteAll(m_iIndexId);
DocstoreReaders_c * pReaders = DocstoreReaders_c::Get();
if ( pReaders )
pReaders->DeleteByIndexId(m_iIndexId);
}
bool Docstore_c::Init ( CSphString & sError )
{
CSphAutoreader tReader;
if ( !tReader.Open ( m_sFilename, sError ) )
return false;
DWORD uStorageVersion = tReader.GetDword();
if ( uStorageVersion > STORAGE_VERSION )
{
sError.SetSprintf ( "Unable to load docstore: %s is v.%d, binary is v.%d", m_sFilename.cstr(), uStorageVersion, STORAGE_VERSION );
return false;
}
m_uBlockSize = tReader.GetDword();
m_eCompression = Byte2Compression ( tReader.GetByte() );
m_pCompressor = CreateCompressor ( m_eCompression, m_iCompressionLevel );
if ( !m_pCompressor )
return false;
m_tFields.Load(tReader);
DWORD uNumBlocks = tReader.GetDword();
if ( !uNumBlocks )
return true;
SphOffset_t tHeaderOffset = tReader.GetOffset();
tReader.SeekTo ( tHeaderOffset, 0 );
m_dBlocks.Reset(uNumBlocks);
DWORD tPrevBlockRowID = 0;
SphOffset_t tPrevBlockOffset = 0;
for ( auto & i : m_dBlocks )
{
i.m_tRowID = tReader.UnzipRowid() + tPrevBlockRowID;
i.m_eType = (BlockType_e)tReader.GetByte();
i.m_tOffset = tReader.UnzipOffset() + tPrevBlockOffset;
if ( i.m_eType==BLOCK_TYPE_BIG )
i.m_uHeaderSize = tReader.UnzipInt();
tPrevBlockRowID = i.m_tRowID;
tPrevBlockOffset = i.m_tOffset;
}
for ( int i = 1; i<m_dBlocks.GetLength(); i++ )
m_dBlocks[i-1].m_uSize = m_dBlocks[i].m_tOffset-m_dBlocks[i-1].m_tOffset;
m_dBlocks.Last().m_uSize = tHeaderOffset-m_dBlocks.Last().m_tOffset;
if ( tReader.GetErrorFlag() )
return false;
tReader.Close();
if ( m_tFile.Open ( m_sFilename, SPH_O_READ, sError ) < 0 )
return false;
return true;
}
const Docstore_c::Block_t * Docstore_c::FindBlock ( RowID_t tRowID ) const
{
const Block_t * pFound = sphBinarySearchFirst ( m_dBlocks.Begin(), m_dBlocks.End()-1, bind(&Block_t::m_tRowID), tRowID );
assert(pFound);
if ( pFound->m_tRowID>tRowID )
{
if ( pFound==m_dBlocks.Begin() )
return nullptr;
return pFound-1;
}
return pFound;
}
void Docstore_c::CreateReader ( int64_t iSessionId ) const
{
DocstoreReaders_c * pReaders = DocstoreReaders_c::Get();
if ( pReaders )
pReaders->CreateReader ( iSessionId, m_iIndexId, m_tFile, m_uBlockSize );
}
int Docstore_c::GetFieldId ( const CSphString & sName, DocstoreDataType_e eType ) const
{
return m_tFields.GetFieldId (sName, eType );
}
DocstoreDoc_t Docstore_c::GetDoc ( RowID_t tRowID, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const
{
#ifndef NDEBUG
// assume that field ids are sorted
for ( int i = 1; pFieldIds && i < pFieldIds->GetLength(); ++i )
assert ( (*pFieldIds)[i-1] < (*pFieldIds)[i] );
#endif
const Block_t * pBlock = FindBlock(tRowID);
assert ( pBlock );
if ( pBlock->m_eType==BLOCK_TYPE_SMALL )
return ReadDocFromSmallBlock ( *pBlock, tRowID, pFieldIds, iSessionId, bPack );
else
return ReadDocFromBigBlock ( *pBlock, pFieldIds, iSessionId, bPack );
}
struct ScopedBlock_t
{
int64_t m_iIndexId = INT64_MAX;
SphOffset_t m_tOffset = 0;
~ScopedBlock_t()
{
if ( m_iIndexId==INT64_MAX )
return;
BlockCache_c * pBlockCache = BlockCache_c::Get();
assert ( pBlockCache );
pBlockCache->Release ( { m_iIndexId, m_tOffset } );
}
};
void Docstore_c::ReadFromFile ( BYTE * pData, int iLength, SphOffset_t tOffset, int64_t iSessionId ) const
{
DocstoreReaders_c * pReaders = DocstoreReaders_c::Get();
CSphReader * pReader = nullptr;
if ( pReaders )
pReader = pReaders->GetReader ( iSessionId, m_iIndexId );
if ( pReader )
{
pReader->SeekTo ( tOffset, iLength );
pReader->GetBytes ( pData, iLength );
}
else
sphPread ( m_tFile.GetFD(), pData, iLength, tOffset );
}
BlockData_t Docstore_c::UncompressSmallBlock ( const Block_t & tBlock, int64_t iSessionId ) const
{
BlockData_t tResult;
CSphFixedVector<BYTE> dBlock ( tBlock.m_uSize );
ReadFromFile ( dBlock.Begin(), dBlock.GetLength(), tBlock.m_tOffset, iSessionId );
MemoryReader2_c tBlockReader ( dBlock.Begin(), dBlock.GetLength() );
tResult.m_uFlags = tBlockReader.GetVal<BYTE>();
tResult.m_uNumDocs = tBlockReader.UnzipInt();
tResult.m_uSize = tBlockReader.UnzipInt();
DWORD uCompressedLength = tResult.m_uSize;
bool bCompressed = tResult.m_uFlags & BLOCK_FLAG_COMPRESSED;
if ( bCompressed )
uCompressedLength = tBlockReader.UnzipInt();
const BYTE * pBody = dBlock.Begin() + tBlockReader.GetPos();
CSphFixedVector<BYTE> dDecompressed(0);
if ( bCompressed )
{
dDecompressed.Reset ( tResult.m_uSize );
Verify ( m_pCompressor->Decompress ( VecTraits_T<const BYTE> (pBody, uCompressedLength), dDecompressed) );
tResult.m_pData = dDecompressed.LeakData();
}
else
{
// we can't just pass tResult.m_pData because it doesn't point to the start of the allocated block
tResult.m_pData = new BYTE[tResult.m_uSize];
memcpy ( tResult.m_pData, pBody, tResult.m_uSize );
}
return tResult;
}
bool Docstore_c::ProcessSmallBlockDoc ( RowID_t tCurDocRowID, RowID_t tRowID, const VecTraits_T<int> * pFieldIds, const CSphFixedVector<int> & dFieldInRset, bool bPack, MemoryReader2_c & tReader, CSphBitvec & tEmptyFields, DocstoreDoc_t & tResult ) const
{
bool bDocFound = tCurDocRowID==tRowID;
if ( bDocFound )
tResult.m_dFields.Resize ( pFieldIds ? pFieldIds->GetLength() : m_tFields.GetNumFields() );
DWORD uBitMaskSize = tEmptyFields.GetSizeBytes();
BYTE uDocFlags = tReader.GetVal<BYTE>();
if ( uDocFlags & DOC_FLAG_ALL_EMPTY )
{
for ( auto & i : tResult.m_dFields )
i.Resize(0);
return bDocFound;
}
bool bHasBitmask = !!(uDocFlags & DOC_FLAG_EMPTY_BITMASK);
if ( bHasBitmask )
{
memcpy ( tEmptyFields.Begin(), tReader.Begin()+tReader.GetPos(), uBitMaskSize );
tReader.SetPos ( tReader.GetPos()+uBitMaskSize );
}
for ( int iField = 0; iField < m_tFields.GetNumFields(); iField++ )
if ( !bHasBitmask || !tEmptyFields.BitGet(iField) )
{
DWORD uFieldLength = tReader.UnzipInt();
int iFieldInRset = dFieldInRset[iField];
if ( bDocFound && iFieldInRset!=-1 )
PackData ( tResult.m_dFields[iFieldInRset], tReader.Begin()+tReader.GetPos(), uFieldLength, m_tFields.GetField(iField).m_eType==DOCSTORE_TEXT, bPack );
tReader.SetPos ( tReader.GetPos()+uFieldLength );
}
return bDocFound;
}
DocstoreDoc_t Docstore_c::ReadDocFromSmallBlock ( const Block_t & tBlock, RowID_t tRowID, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const
{
BlockCache_c * pBlockCache = BlockCache_c::Get();
BlockData_t tBlockData;
bool bFromCache = pBlockCache && pBlockCache->Find ( { m_iIndexId, tBlock.m_tOffset }, tBlockData );
if ( !bFromCache )
{
tBlockData = UncompressSmallBlock ( tBlock, iSessionId );
bFromCache = pBlockCache && pBlockCache->Add ( { m_iIndexId, tBlock.m_tOffset }, tBlockData );
}
ScopedBlock_t tScopedBlock;
CSphFixedVector<BYTE> tDataPtr {0}; // scoped array ptr
if ( bFromCache )
{
tScopedBlock.m_iIndexId = m_iIndexId;
tScopedBlock.m_tOffset = tBlock.m_tOffset;
}
else
tDataPtr.Set ( tBlockData.m_pData, 0 );
CSphFixedVector<int> dFieldInRset ( m_tFields.GetNumFields() );
CreateFieldRemap ( dFieldInRset, pFieldIds );
DocstoreDoc_t tResult;
RowID_t tCurDocRowID = tBlock.m_tRowID;
MemoryReader2_c tReader ( tBlockData.m_pData, tBlockData.m_uSize );
CSphBitvec tEmptyFields ( m_tFields.GetNumFields() );
for ( int i = 0; i < (int)tBlockData.m_uNumDocs; i++ )
{
if ( ProcessSmallBlockDoc ( tCurDocRowID, tRowID, pFieldIds, dFieldInRset, bPack, tReader, tEmptyFields, tResult ) )
break;
tCurDocRowID++;
}
return tResult;
}
BlockData_t Docstore_c::UncompressBigBlockField ( SphOffset_t tOffset, const FieldInfo_t & tInfo, int64_t iSessionId ) const
{
BlockData_t tResult;
bool bCompressed = !!( tInfo.m_uFlags & FIELD_FLAG_COMPRESSED );
DWORD uDataLen = bCompressed ? tInfo.m_uCompressedLen : tInfo.m_uUncompressedLen;
CSphFixedVector<BYTE> dField ( uDataLen );
ReadFromFile ( dField.Begin(), dField.GetLength(), tOffset, iSessionId );
tResult.m_uSize = tInfo.m_uUncompressedLen;
CSphFixedVector<BYTE> dDecompressed(0);
if ( bCompressed )
{
dDecompressed.Reset ( tResult.m_uSize );
Verify ( m_pCompressor->Decompress ( dField, dDecompressed ) );
tResult.m_pData = dDecompressed.LeakData();
}
else
tResult.m_pData = dField.LeakData();
return tResult;
}
void Docstore_c::ProcessBigBlockField ( int iField, const FieldInfo_t & tInfo, int iFieldInRset, bool bPack, int64_t iSessionId, SphOffset_t & tOffset, DocstoreDoc_t & tResult ) const
{
if ( tInfo.m_uFlags & FIELD_FLAG_EMPTY )
return;
bool bCompressed = !!( tInfo.m_uFlags & FIELD_FLAG_COMPRESSED );
SphOffset_t tOffsetDelta = bCompressed ? tInfo.m_uCompressedLen : tInfo.m_uUncompressedLen;
if ( iFieldInRset==-1 )
{
tOffset += tOffsetDelta;
return;
}
BlockCache_c * pBlockCache = BlockCache_c::Get();
BlockData_t tBlockData;
bool bFromCache = pBlockCache && pBlockCache->Find ( { m_iIndexId, tOffset }, tBlockData );
if ( !bFromCache )
{
tBlockData = UncompressBigBlockField ( tOffset, tInfo, iSessionId );
bFromCache = pBlockCache && pBlockCache->Add ( { m_iIndexId, tOffset }, tBlockData );
}
ScopedBlock_t tScopedBlock;
CSphFixedVector<BYTE> tDataPtr {0}; // scoped array ptr
if ( bFromCache )
{
tScopedBlock.m_iIndexId = m_iIndexId;
tScopedBlock.m_tOffset = tOffset;
}
else
tDataPtr.Set ( tBlockData.m_pData, 0 );
PackData ( tResult.m_dFields[iFieldInRset], tBlockData.m_pData, tBlockData.m_uSize, m_tFields.GetField(iField).m_eType==DOCSTORE_TEXT, bPack );
tOffset += tOffsetDelta;
}
DocstoreDoc_t Docstore_c::ReadDocFromBigBlock ( const Block_t & tBlock, const VecTraits_T<int> * pFieldIds, int64_t iSessionId, bool bPack ) const
{
CSphFixedVector<FieldInfo_t> dFieldInfo ( m_tFields.GetNumFields() );
CSphFixedVector<BYTE> dBlockHeader(tBlock.m_uHeaderSize);
ReadFromFile ( dBlockHeader.Begin(), dBlockHeader.GetLength(), tBlock.m_tOffset, iSessionId );
MemoryReader2_c tReader ( dBlockHeader.Begin(), dBlockHeader.GetLength() );
CSphVector<int> dFieldSort;
BYTE uBlockFlags = tReader.GetVal<BYTE>();
bool bNeedReorder = !!( uBlockFlags & BLOCK_FLAG_FIELD_REORDER );
if ( bNeedReorder )
{
dFieldSort.Resize ( m_tFields.GetNumFields() );
for ( auto & i : dFieldSort )
i = tReader.UnzipInt();
}
for ( int i = 0; i < m_tFields.GetNumFields(); i++ )
{
int iField = bNeedReorder ? dFieldSort[i] : i;
FieldInfo_t & tInfo = dFieldInfo[iField];
tInfo.m_uFlags = tReader.GetVal<BYTE>();
if ( tInfo.m_uFlags & FIELD_FLAG_EMPTY )
continue;
tInfo.m_uUncompressedLen = tReader.UnzipInt();
if ( tInfo.m_uFlags & FIELD_FLAG_COMPRESSED )
tInfo.m_uCompressedLen = tReader.UnzipInt();
}
dBlockHeader.Reset(0);
CSphFixedVector<int> dFieldInRset ( m_tFields.GetNumFields() );
CreateFieldRemap ( dFieldInRset, pFieldIds );
DocstoreDoc_t tResult;
tResult.m_dFields.Resize ( pFieldIds ? pFieldIds->GetLength() : m_tFields.GetNumFields() );
SphOffset_t tOffset = tBlock.m_tOffset+tBlock.m_uHeaderSize;
// i == physical field order in file
// dFieldSort[i] == field order as in m_dFields
// dFieldInRset[iField] == field order in result set
for ( int i = 0; i < m_tFields.GetNumFields(); i++ )
{
int iField = bNeedReorder ? dFieldSort[i] : i;
ProcessBigBlockField ( iField, dFieldInfo[iField], dFieldInRset[iField], bPack, iSessionId, tOffset, tResult );
}
return tResult;
}
DocstoreSettings_t Docstore_c::GetDocstoreSettings() const
{
return *this;
}
//////////////////////////////////////////////////////////////////////////
DocstoreBuilder_i::Doc_t::Doc_t()
{}
DocstoreBuilder_i::Doc_t::Doc_t ( const DocstoreDoc_t & tDoc )
{
m_dFields.Resize ( tDoc.m_dFields.GetLength() );
ARRAY_FOREACH ( i, m_dFields )
m_dFields[i] = VecTraits_T<BYTE> ( tDoc.m_dFields[i].Begin(), tDoc.m_dFields[i].GetLength() );
}
//////////////////////////////////////////////////////////////////////////
class DocstoreBuilder_c : public DocstoreBuilder_i, public DocstoreSettings_t
{
public:
DocstoreBuilder_c ( CSphString sFilename, const DocstoreSettings_t & tSettings );
bool Init ( CSphString & sError );
void AddDoc ( RowID_t tRowID, const Doc_t & tDoc ) final;
int AddField ( const CSphString & sName, DocstoreDataType_e eType ) final { return m_tFields.AddField ( sName, eType ); }
void RemoveField ( const CSphString & sName, DocstoreDataType_e eType ) final { return m_tFields.RemoveField ( sName, eType ); }
int GetFieldId ( const CSphString & sName, DocstoreDataType_e eType ) const final { return m_tFields.GetFieldId ( sName, eType ); }
void Finalize() final;
private:
struct StoredDoc_t
{