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david hill
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writeengine/shared/we_bulkrollbackfile.h
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207
writeengine/shared/we_bulkrollbackfile.h
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/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/*
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* $Id: we_bulkrollbackfile.h 4675 2013-06-13 15:20:37Z dcathey $
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*/
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/** @file
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* Contains class to restore db files on behalf of BulkRollBackMgr.
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* In some cases this means restoring an extent to it's previous state.
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* In some cases, it may mean removing extent(s) that were added to a file.
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* In other cases it may mean completely deleting a db segment file, if that
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* file did not exist prior to an aborted bulk load.
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*/
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#ifndef WE_BULKROLLBACKFILE_H_
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#define WE_BULKROLLBACKFILE_H_
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#include <string>
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#include "we_define.h"
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#include "we_type.h"
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#include "we_fileop.h"
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namespace WriteEngine
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{
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class BulkRollbackMgr;
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//------------------------------------------------------------------------------
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/** @brief Class used by BulkRollbackMgr to restore db files.
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*/
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//------------------------------------------------------------------------------
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class BulkRollbackFile
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{
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public:
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/** @brief BulkRollbackFile constructor
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* @param mgr The controlling BulkRollbackMgr object.
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*/
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BulkRollbackFile(BulkRollbackMgr* mgr);
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/** @brief BulkRollbackFile destructor
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*/
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virtual ~BulkRollbackFile();
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/** @brief Construct the relevant db filename.
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* Warning: This function may throw a WeException.
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*
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* @param columnOID OID of the segment file to be deleted
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* @param fileTypeFlag file type (true->column; false->dictionary)
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* @param dbRoot DBRoot of the segment file to be deleted
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* @param partNum Partition number of the segment file to be deleted
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* @param segNum Segment number of the segment file to be deleted
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* @param segFileName (out) Name of segment file
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*/
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void buildSegmentFileName(OID columnOID,
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bool fileTypeFlag,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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std::string& segFileName);
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/** @brief Delete a segment file.
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* Warning: This function may throw a WeException.
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*
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* @param columnOID OID of the segment file to be deleted
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* @param fileTypeFlag file type (true->column; false->dictionary)
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* @param dbRoot DBRoot of the segment file to be deleted
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* @param partNum Partition number of the segment file to be deleted
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* @param segNum Segment number of the segment file to be deleted
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* @param segFileName Name of segment file to be deleted
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*/
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void deleteSegmentFile(OID columnOID,
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bool fileTypeFlag,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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const std::string& segFileName );
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/** @brief Construct a directory path.
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*
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* @param oid (in) OID to use in constructing directory path
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* @param dbRoot (in) DBRoot to use in constructing directory path
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* @param partition (in) Partition number to use in constructing dir path
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* @param dirName (out)Directory path constructed from input arguments
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* @return returns NO_ERROR if success
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*/
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int buildDirName( OID oid,
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uint16_t dbRoot,
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uint32_t partition,
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std::string& dirName);
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/** @brief Do we reinit trailing blocks in the HWM extent for the specified
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* segment file
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*
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* The base behavior of this function always returns true, to reinit
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* any trailing blocks in the HWM extent (for uncompressed data) to
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* empty values.
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*
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* @param columnOID OID of the segment file in question
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* @param dbRoot DBRoot for the segment file in question
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* @param partNum Partition number for the segment file in question
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* @param segNum Segment number for the segment file in question
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*/
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virtual bool doWeReInitExtent( OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum) const;
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/** @brief Reinitialize the specified column segment file starting at
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* startOffsetBlk, and truncate trailing extents.
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* Warning: This function may throw a WeException.
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*
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param startOffsetBlk Starting block offset where file is to be
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* reinitialized
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* @param nBlocks Number of blocks to be reinitialized
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* @param colType Column type of the relevant segment file
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* @param colWidth Width in bytes of column.
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* @param restoreHwmChk Restore HWM chunk (n/a to uncompressed)
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*/
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virtual void reInitTruncColumnExtent(OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long startOffsetBlk,
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int nBlocks,
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execplan::CalpontSystemCatalog::ColDataType colType,
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uint32_t colWidth,
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bool restoreHwmChk );
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/** @brief Reinitialize the specified dictionary store segment file starting
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* at startOffsetBlk, and truncate trailing extents.
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* Warning: This function may throw a WeException.
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*
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param startOffsetBlk Starting block offset where file is to be
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* reinitialized
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* @param nBlocks Number of blocks to be reinitialized
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*/
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virtual void reInitTruncDctnryExtent(OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long startOffsetBlk,
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int nBlocks );
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/** @brief Truncate the specified segment file to a specified num of bytes
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* Warning: This function may throw a WeException.
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*
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param fileSizeBlocks Number of blocks to retain in the file
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*/
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virtual void truncateSegmentFile( OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long filesSizeBlocks );
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protected:
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BulkRollbackMgr* fMgr; // Bulk Rollback controller
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FileOp fDbFile; // interface to DB file
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unsigned char fDctnryHdr[DCTNRY_HEADER_SIZE]; // empty dctnry store blk
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private:
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// Disable unnecessary copy constructor and assignment operator
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BulkRollbackFile(const BulkRollbackFile& rhs);
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BulkRollbackFile& operator=(const BulkRollbackFile& rhs);
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};
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//------------------------------------------------------------------------------
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// Inline functions
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//------------------------------------------------------------------------------
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inline int BulkRollbackFile::buildDirName( OID oid,
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uint16_t dbRoot,
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uint32_t partition,
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std::string& dirName)
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{
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return fDbFile.getDirName( oid, dbRoot, partition, dirName );
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}
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} //end of namespace
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#endif // WE_BULKROLLBACKFILE_H_
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