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mariadb-columnstore-engine/writeengine/bulk/we_colbufmgr.cpp
Andrew Hutchings 01446d1e22 Reformat all code to coding standard
2017-10-26 17:18:17 +01:00

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/* Copyright (C) 2014 InfiniDB, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2 of
the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
/*****************************************************************************
* $Id: we_colbufmgr.cpp 4726 2013-08-07 03:38:36Z bwilkinson $
*
****************************************************************************/
/** @file
* ColumnBufferManager methods used to coordinate writes to db column files.
*
* ColumnBufferManager methods collect data in an internal buffer from
* multiple threads, and then periodically flushes the buffer to the relevant
* DB column segment file. However, if the output is to be compressed, then
* instead of flushing the buffer to disk, the data is instead copied to a to-
* be-compressed buffer, where it is collected and later flushed to disk by
* ColumnBufferCompressed.
*/
#include "we_colbufmgr.h"
#include "we_colbuf.h"
#include "we_colbufcompressed.h"
#include "we_columninfo.h"
#include "we_bulkstatus.h"
#include "we_log.h"
#include "blocksize.h"
#include <sstream>
#include <boost/date_time/posix_time/posix_time_types.hpp>
namespace
{
// Minimum time to wait for a condition, so as to periodically wake up and
// check the global job status, to see if the job needs to terminate.
const int COND_WAIT_SECONDS = 3;
}
namespace WriteEngine
{
//------------------------------------------------------------------------------
// ColumnBufferManger constructor
//------------------------------------------------------------------------------
ColumnBufferManager::ColumnBufferManager(ColumnInfo* pColInfo,
int width, Log* logger, int compressionType) :
fBufWriteOffset(0), fBufFreeOffset(0), fResizePending(false),
fColWidth(width),
fMaxRowId(std::numeric_limits<WriteEngine::RID>::max()),
fColInfo(pColInfo), fLog(logger)
{
if (compressionType)
fCBuf = new ColumnBufferCompressed(pColInfo, logger);
else
fCBuf = new ColumnBuffer(pColInfo, logger);
}
//------------------------------------------------------------------------------
// ColumnBufferManger destructor
//------------------------------------------------------------------------------
ColumnBufferManager::~ColumnBufferManager()
{
if (fCBuf)
delete fCBuf;
}
//------------------------------------------------------------------------------
// Reserve a section out of the output buffer for the application code to begin
// using to store data destined for the database.
// startRowId (in) - starting RID for the rows to be stored in this section
// nRowsIn (in) - desired number of rows to be stored in this section
// secRowCnt (out) - number of rows that the returned ColumnBufferSection can
// hold. This may be smaller than nRowsIn (for dictionary
// column) if the rows cross an extent boundary.
// The application code will need to make a second call
// later, to create a section to handle the remaining rows
// that this section could not hold.
// cbs (out) - reserved section pointer
// lastInputRowInExtent(out) - last input Row number (relative to start of job)
// that can go into the current extent we are loading.
//
// Basic algorithm:
// 1. Wait to ensure that ColumnBufferSection allocations are made in input
// row order
// 2. Wait for any pending output buffer expansion to be completed
// 3. If buffer does not have enough room to contain nRowsIn of data, then
// a. If there are any ColumnBufferSections in use, then
// wait for these ColumnBufferSections to be released
// b. If there is any data in the output buffer, then
// flush the data (rounded down to nearest 8192-byte block)
// c. Expand the output buffer, and
// copy the remaining data to the front of the newly expanded buffer
//
// @bug 3456
// Note that when determining whether the output buffer has enough room or
// not, we are comparing to remainingSpace-1 and not remainingSpace. We
// don't want output buffer to get completely full, because we can't
// distinguish between a buffer that is full, and one that is empty;
// as both cases are indicated by fBufFreeOffset == fBufWriteOffset.
// If we allow output buffer to get exactly full, then we end up
// losing track of data because we will think the buffer is empty.
//
// 6. Allocate new ColumnBufferSection
// 7. Update fBufFreeOffset, fSectionsInUse, fMaxRowId
//------------------------------------------------------------------------------
int ColumnBufferManager::reserveSection(
RID startRowId,
uint32_t nRowsIn,
uint32_t& secRowCnt,
ColumnBufferSection** cbs,
RID& lastInputRowInExtent)
{
#ifdef PROFILE
Stats::startParseEvent(WE_STATS_WAIT_TO_RESERVE_OUT_BUF);
#endif
*cbs = 0;
boost::posix_time::seconds wait_seconds(COND_WAIT_SECONDS);
boost::mutex::scoped_lock lock(fColInfo->colMutex());
//..Ensure that ColumnBufferSection allocations are made in input row order
bool bWaitedForInSequence = false;
while (1)
{
RID startRowTest = (std::numeric_limits<WriteEngine::RID>::max() ==
fMaxRowId) ? 0 : fMaxRowId + 1;
if (startRowTest == startRowId)
break;
if (fLog->isDebug( DEBUG_3 ))
{
bWaitedForInSequence = true;
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Waiting for in-sequence";
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
fOutOfSequence.timed_wait(lock, wait_seconds);
// See if JobStatus has been set to terminate by another thread
if (BulkStatus::getJobStatus() == EXIT_FAILURE)
{
throw SecondaryShutdownException( "ColumnBufferManager::"
"reserveSection(1) responding to job termination");
}
}
if (fLog->isDebug( DEBUG_3 ))
{
if (bWaitedForInSequence)
{
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Resume after waiting for in-sequence";
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
}
//..Check/wait for any pending output buffer expansion to be completed
bool bWaitedForResize = false;
while (fResizePending)
{
if (fLog->isDebug( DEBUG_3 ))
{
bWaitedForResize = true;
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Waiting for pending resize";
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
fResizeInProgress.timed_wait(lock, wait_seconds);
// See if JobStatus has been set to terminate by another thread
if (BulkStatus::getJobStatus() == EXIT_FAILURE)
{
throw SecondaryShutdownException( "ColumnBufferManager::"
"reserveSection(2) responding to job termination");
}
}
if (fLog->isDebug( DEBUG_3 ))
{
if (bWaitedForResize)
{
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Resume after waiting for pending resize";
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
}
#ifdef PROFILE
Stats::stopParseEvent(WE_STATS_WAIT_TO_RESERVE_OUT_BUF);
#endif
// Through the use of the mutex lock and the fResizePending flag, nobody
// should be changing the buffer size out from under us; so okay to save in
// local variable till we call resizeColumnBuffer() to expand the buffer.
int bufferSize = fCBuf->getSize();
int remainingSpace = 0;
if (bufferSize > 0)
{
//Calculate remaining space
remainingSpace = bufferSize -
(fBufFreeOffset + bufferSize - fBufWriteOffset) % bufferSize;
}
//..Restrict the new section to the extent boundary if applicable.
// We assume here that the colMutex() lock will assure the integrity
// of the values used in evaluating or recalculating spaceRequired.
int nRows = 0;
RETURN_ON_ERROR( rowsExtentCheck( nRowsIn, nRows ) );
int spaceRequired = nRows * fColWidth;
if (nRows > 0)
{
//..If not enough room to add nRows to output buffer, wait for pending
// sections to be released, so that we can flush and resize the buffer.
//..@bug 3456: compare to remainingSpace-1 and not remainingSpace.
// See note in function description that precedes this function.
if (spaceRequired > (remainingSpace - 1))
{
//#ifdef PROFILE
// Stats::startParseEvent(WE_STATS_WAIT_TO_RESIZE_OUT_BUF);
//#endif
fResizePending = true;
bool bWaitedForSectionsInUse = false;
// Wait for all other threads to finish writing pending sections
// to the output buffer, before we resize the buffer
while (fSectionsInUse.size() > 0)
{
if (fLog->isDebug( DEBUG_3 ))
{
bWaitedForSectionsInUse = true;
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Waiting to resize output buffer; "
"sections in-use: " <<
fSectionsInUse.size();
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
fBufInUse.timed_wait(lock, wait_seconds);
// See if JobStatus has been set to quit by another thread
if (BulkStatus::getJobStatus() == EXIT_FAILURE)
{
throw SecondaryShutdownException( "ColumnBufferManager::"
"reserveSection(3) responding to job termination");
}
}
//#ifdef PROFILE
// Stats::stopParseEvent(WE_STATS_WAIT_TO_RESIZE_OUT_BUF);
// Stats::startParseEvent(WE_STATS_RESIZE_OUT_BUF);
//#endif
if (fLog->isDebug( DEBUG_3 ))
{
if (bWaitedForSectionsInUse)
{
std::ostringstream oss;
oss << "OID-" << fColInfo->curCol.dataFile.fid <<
"; Resume after waiting to resize output buffer";
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
}
// @bug 1977 correct problem; writing extra blocks
// Flush remaining data blocks to disk "if" buffer contains data
if (bufferSize > 0)
{
if (fBufFreeOffset != fBufWriteOffset)
RETURN_ON_ERROR( writeToFile(
(fBufFreeOffset + bufferSize - 1) % bufferSize) );
}
resizeColumnBuffer(spaceRequired);
bufferSize = fCBuf->getSize(); // update bufferSize after resize-
// ColumnBuffer() expanded the buffer
fResizePending = false;
fResizeInProgress.notify_all();
//#ifdef PROFILE
// Stats::stopParseEvent(WE_STATS_RESIZE_OUT_BUF);
//#endif
} // (spaceRequired > remainingSpace-1)
*cbs = new ColumnBufferSection(
fCBuf, startRowId, startRowId + nRows - 1,
fColWidth, fBufFreeOffset);
fBufFreeOffset = (fBufFreeOffset + nRows * fColWidth) % bufferSize;
fSectionsInUse.push_back(*cbs);
fMaxRowId = startRowId + nRows - 1;
fOutOfSequence.notify_all();
} // (nRows > 0)
secRowCnt = nRows;
// Get/return last input Row number for the extent this buffer goes in.
// If we determine this set of rows will cross over to the next extent,
// then we tell ColumnInfo to bump the last Row to the end of the next
// extent, in preparation for the next Read buffer going into the next
// extent. We do this even though we have not yet allocated the next
// extent from the extent map.
lastInputRowInExtent = fColInfo->lastInputRowInExtent( );
if ((startRowId + nRowsIn) > lastInputRowInExtent)
fColInfo->lastInputRowInExtentInc( );
return NO_ERROR;
}
//------------------------------------------------------------------------------
// Release the data in the specified ColumnBufferSection, meaning the data in
// that section is ready to be written to the database.
//------------------------------------------------------------------------------
int ColumnBufferManager::releaseSection(ColumnBufferSection* cbs)
{
#ifdef PROFILE
Stats::startParseEvent(WE_STATS_WAIT_TO_RELEASE_OUT_BUF);
#endif
boost::mutex::scoped_lock lock(fColInfo->colMutex());
#ifdef PROFILE
Stats::stopParseEvent(WE_STATS_WAIT_TO_RELEASE_OUT_BUF);
#endif
cbs->setStatus(WRITE_COMPLETE);
int lastWriteOffset = fBufWriteOffset;
std::list<ColumnBufferSection*>::iterator it = fSectionsInUse.begin();
if (it != fSectionsInUse.end())
{
ColumnBufferSection* cbs_temp = *it;
while (WRITE_COMPLETE == cbs_temp->getStatus())
{
lastWriteOffset = cbs_temp->getStartOffset() +
cbs_temp->getSectionSize() - 1;
delete cbs_temp;
it = fSectionsInUse.erase(it);
if (it == fSectionsInUse.end())
break;
cbs_temp = *it;
}
}
fBufInUse.notify_all();
RETURN_ON_ERROR( writeToFile(lastWriteOffset) );
return NO_ERROR;
}
//------------------------------------------------------------------------------
// Expand the output buffer for the column this ColumBufferManager is managing.
// "spaceRequired" indicates the number of additional bytes that are needed.
//------------------------------------------------------------------------------
void ColumnBufferManager::resizeColumnBuffer(int spaceRequired)
{
int bufferSize = fCBuf->getSize();
int bufferSizeOld = bufferSize;
int dataRemaining = (bufferSize > 0) ?
((fBufFreeOffset - fBufWriteOffset + bufferSize) % bufferSize) : 0;
int resizeAction = 0;
if (0 == bufferSize)
{
bufferSize = (int)(spaceRequired * 1.2); //Additional 20% to account
//for changes in number of rows
//because of varying line-widths
resizeAction = 1;
}
else
{
if (spaceRequired > bufferSize)
{
bufferSize = spaceRequired * 2;
resizeAction = 2;
}
else
{
bufferSize *= 2; //Double the buffer size
resizeAction = 3;
}
}
//Round off the bufferSize to size of a disk block
if (bufferSize % BLOCK_SIZE > 0)
{
bufferSize = (((int)(bufferSize / BLOCK_SIZE)) + 1) * BLOCK_SIZE;
}
if (resizeAction > 0)
{
if (fLog->isDebug( DEBUG_2 ))
{
RID numRowsInBuffer = dataRemaining / fColWidth;
RID firstRid = fMaxRowId - numRowsInBuffer + 1;
std::ostringstream oss;
oss << "Resizing out buffer (case" <<
resizeAction << ") for OID-" <<
fColInfo->curCol.dataFile.fid <<
"; oldSize-" << bufferSizeOld <<
"; freeOff-" << fBufFreeOffset <<
"; writeOff-" << fBufWriteOffset <<
"; startRID-" << firstRid <<
"; rows-" << numRowsInBuffer <<
"; reqBytes-" << spaceRequired <<
"; newSize-" << bufferSize;
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
}
// @bug 1977 correct problem; writing extra blocks
// If we have no data in buffer, we still call resizeAndCopy()
// to expand the buffer; we just pass -1 for the buffer offsets.
if (fBufFreeOffset == fBufWriteOffset)
{
fCBuf->resizeAndCopy(bufferSize, -1, -1);
}
else
{
int endOffset = (fBufFreeOffset + bufferSize - 1) % bufferSize;
fCBuf->resizeAndCopy(bufferSize, fBufWriteOffset, endOffset);
}
fBufFreeOffset = dataRemaining;
fBufWriteOffset = 0;
}
//------------------------------------------------------------------------------
// Writes data from our output buffer starting at fBufWriteOffset, through the
// "endOffset" that is specified (rounded down to nearest 8192-byte block).
// Trailing data (less than 1 block) is left in the output buffer.
// Keep in mind that the output buffer is a circular buffer, so if the
// applicable bytes "wrap-around" in the buffer, then this function will
// perform 2 I/O operations to write the 2 noncontiguous chunks of data.
//------------------------------------------------------------------------------
int ColumnBufferManager::writeToFile(int endOffset)
{
int bufferSize = fCBuf->getSize();
if (endOffset == fBufWriteOffset)
return NO_ERROR;
unsigned int writeSize =
(endOffset - fBufWriteOffset + bufferSize) % bufferSize + 1;
// Don't bother writing anything if we don't at least have a BLOCK_SIZE
// set of bytes to write out; which means we need to be sure to flush
// the buffer at the end, because we could have leftover bytes that we
// have not yet written out.
if (writeSize < BLOCK_SIZE)
return NO_ERROR;
writeSize = writeSize - writeSize % BLOCK_SIZE; //round down to mult of blksiz
endOffset = (fBufWriteOffset + writeSize - 1) % bufferSize;
if (fLog->isDebug( DEBUG_3 ))
{
std::ostringstream oss;
oss << "Writing OID-" << fColInfo->curCol.dataFile.fid <<
"; bufWriteOff-" << fBufWriteOffset <<
"; bufFreeOff-" << fBufFreeOffset <<
"; endWrite-" << endOffset <<
"; bytesToWrite-" << writeSize <<
"; bufSize-" << bufferSize;
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
// Account for circular buffer by making 2 calls to write the data,
// if we are wrapping around at the end of the buffer.
if (endOffset < fBufWriteOffset)
{
RETURN_ON_ERROR( writeToFileExtentCheck(
fBufWriteOffset, bufferSize - fBufWriteOffset) );
fBufWriteOffset = 0;
}
RETURN_ON_ERROR( writeToFileExtentCheck(
fBufWriteOffset, endOffset - fBufWriteOffset + 1) );
fBufWriteOffset = (endOffset + 1) % bufferSize;
return NO_ERROR;
}
//------------------------------------------------------------------------------
// Writes the specified bytes from the internal buffer to the db column file.
// The data to be written, starts at "startOffset" in the internal buffer and
// is "writeSize" bytes long.
// This function also checks to see if an extent needs to be added to the db
// column file for this number of bytes. If a second extent is required,
// then the current db file will be filled out with the 1st part of the buffer,
// and the remaining buffer data will be written to the next segment file in
// the DBRoot, partition, segement number sequence.
// This function also catches and handles the case where an abbreviated
// extent needs to be expanded to a full extent on disk.
//
// WARNING: This means this function may change the information in the
// ColumnInfo struct that owns this ColumnBufferManager, if a
// second db column file has to be opened to finish writing the
// internal buffer, or if an abbreviated extent is expanded.
//------------------------------------------------------------------------------
int ColumnBufferManager::writeToFileExtentCheck(
uint32_t startOffset, uint32_t writeSize)
{
if (fLog->isDebug( DEBUG_3 ))
{
std::ostringstream oss;
oss << "Col extent check: OID-" <<
fColInfo->curCol.dataFile.fid <<
"; DBRoot-" << fColInfo->curCol.dataFile.fDbRoot <<
"; part-" << fColInfo->curCol.dataFile.fPartition <<
"; seg-" << fColInfo->curCol.dataFile.fSegment <<
"; Wanting to write " << writeSize <<
" bytes, with avail space " << fColInfo->availFileSize;
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
// Don't need a mutex lock here because if writeToFile() is calling
// us, we already have a lock; and if flush() is calling us, then
// all parsing is complete, so we should have no thread contention.
// If extent out of space, see if this is an abbrev extent we can expand
long long availableFileSize = fColInfo->availFileSize;
if ((availableFileSize < writeSize) && (fColInfo->isAbbrevExtent()))
{
int rc = fColInfo->expandAbbrevExtent(true);
if (rc != NO_ERROR)
{
WErrorCodes ec;
std::ostringstream oss;
oss << "writeToFileExtentCheck: expand extent failed: " <<
ec.errorString(rc);
fLog->logMsg( oss.str(), rc, MSGLVL_ERROR );
return rc;
}
availableFileSize = fColInfo->availFileSize;
}
if (availableFileSize >= writeSize)
{
int rc = fCBuf->writeToFile(startOffset, writeSize);
if (rc != NO_ERROR)
{
WErrorCodes ec;
std::ostringstream oss;
oss << "writeToFileExtentCheck: write1 extent failed: " <<
ec.errorString(rc);
fLog->logMsg( oss.str(), rc, MSGLVL_ERROR );
return rc;
}
fColInfo->updateBytesWrittenCounts( writeSize );
}
else
{
// We use ColumnInfo to help us add an extent to the "next"
// segment file, if needed.
// Current extent does not have enough room for buffer, so we
// have to break up the buffer into 2 extents; creating a new
// extent and switching the db column file "on-the-fly".
int writeSize1 = availableFileSize;
if (writeSize1 > 0)
{
int rc = fCBuf->writeToFile(startOffset, writeSize1);
if (rc != NO_ERROR)
{
WErrorCodes ec;
std::ostringstream oss;
oss << "writeToFileExtentCheck: write2 extent failed: " <<
ec.errorString(rc);
fLog->logMsg( oss.str(), rc, MSGLVL_ERROR );
return rc;
}
fColInfo->updateBytesWrittenCounts( writeSize1 );
}
int rc = fColInfo->extendColumn( true );
if (rc != NO_ERROR)
{
WErrorCodes ec;
std::ostringstream oss;
oss << "writeToFileExtentCheck: extend column failed: " <<
ec.errorString(rc);
fLog->logMsg( oss.str(), rc, MSGLVL_ERROR );
return rc;
}
int writeSize2 = writeSize - writeSize1;
fCBuf->writeToFile(startOffset + writeSize1, writeSize2);
if (rc != NO_ERROR)
{
WErrorCodes ec;
std::ostringstream oss;
oss << "writeToFileExtentCheck: write3 extent failed: " <<
ec.errorString(rc);
fLog->logMsg( oss.str(), rc, MSGLVL_ERROR );
return rc;
}
fColInfo->updateBytesWrittenCounts( writeSize2 );
}
return NO_ERROR;
}
//------------------------------------------------------------------------------
// Flush the contents of internal fCBuf (column buffer) to disk.
//------------------------------------------------------------------------------
int ColumnBufferManager::flush( )
{
if (fBufFreeOffset == fBufWriteOffset)
{
if (fLog->isDebug( DEBUG_2 ))
{
std::ostringstream oss;
oss << "Skipping write flush for: OID-" <<
fColInfo->curCol.dataFile.fid <<
"; DBRoot-" << fColInfo->curCol.dataFile.fDbRoot <<
"; part-" << fColInfo->curCol.dataFile.fPartition <<
"; seg-" << fColInfo->curCol.dataFile.fSegment <<
"; both fBufFreeOffset and fBufWriteOffset = " <<
fBufFreeOffset;
fLog->logMsg( oss.str(), MSGLVL_INFO2 );
}
return NO_ERROR;
}
int bufferSize = fCBuf->getSize();
// Account for circular buffer by making 2 calls to write the data,
// if we are wrapping around at the end of the buffer.
if (fBufFreeOffset < fBufWriteOffset)
{
RETURN_ON_ERROR( writeToFileExtentCheck(
fBufWriteOffset, bufferSize - fBufWriteOffset) );
fBufWriteOffset = 0;
}
RETURN_ON_ERROR( writeToFileExtentCheck(
fBufWriteOffset, fBufFreeOffset - fBufWriteOffset) );
fBufWriteOffset = fBufFreeOffset;
return NO_ERROR;
}
//------------------------------------------------------------------------------
// In the middle of parsing a Read buffer, if we detect that the buffer will
// need to be split among 2 different extents, then this function should be
// called to flush the first part of the buffer into the first extent, before
// writing the second part of the buffer into the second extent. This function
// will wait for the pending sections to be parsed so that they can all be
// flushed to the segment file containing the first extent. This function is
// currently only needed for Dictionary column processing.
//------------------------------------------------------------------------------
int ColumnBufferManager::intermediateFlush()
{
boost::posix_time::seconds wait_seconds(COND_WAIT_SECONDS);
boost::mutex::scoped_lock lock(fColInfo->colMutex());
// Wait for all other threads which are currently parsing rows,
// to finish parsing the data in those sections.
#ifdef PROFILE
Stats::startParseEvent(WE_STATS_WAIT_FOR_INTERMEDIATE_FLUSH);
#endif
while (fSectionsInUse.size() > 0)
{
fBufInUse.timed_wait(lock, wait_seconds);
// See if JobStatus has been set to terminate by another thread
if (BulkStatus::getJobStatus() == EXIT_FAILURE)
{
throw SecondaryShutdownException( "ColumnBufferManager::"
"intermediateFlush() responding to job termination");
}
}
#ifdef PROFILE
Stats::stopParseEvent(WE_STATS_WAIT_FOR_INTERMEDIATE_FLUSH);
#endif
RETURN_ON_ERROR( flush( ) );
return NO_ERROR;
}
//------------------------------------------------------------------------------
// This function is a no-op for non-dictionary columns, but it is provided as
// a hook for ColumnBufferManagerDctnry to provide a function that adds extents
// as sections from the output buffer are being copied to the column segment
// file(s).
//------------------------------------------------------------------------------
int ColumnBufferManager::rowsExtentCheck( int nRows, int& nRows2 )
{
nRows2 = nRows;
return NO_ERROR;
}
//------------------------------------------------------------------------------
// This wrapper function wraps a mutex lock around the call to extendColumn().
// For typical numeric column processing, extendColumn() is called from within
// ColumnBufferManager::writeToFileExtentCheck() which already has a mutex lock.
// But dictionary token processing detects/extends a token column outside of
// ColumnBufferManager; hence the need for this function to be called to employ
// a mutex lock around the call to extendColumn().
//------------------------------------------------------------------------------
int ColumnBufferManager::extendTokenColumn( )
{
boost::mutex::scoped_lock lock(fColInfo->colMutex());
return fColInfo->extendColumn( false );
}
}
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