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MCOL-5021 Add an option in Columnstore.xml, fastdelete (disabled

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by default), which when enabled, indiscriminately invalidates all
column extents and performs the actual DELETE only on the AUX
column. The trade-off with this approach would now be that the
first SELECT for certain query patterns (those containing a WHERE
predicate) after the DELETE operation will slow down as the
invalidated column extent would need to be scanned again to set
the min/max values.
This commit is contained in:
Gagan Goel
2022-05-26 15:13:19 -04:00
parent 2280b1dd25
commit c8b6b154bf
6 changed files with 96 additions and 32 deletions
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26
writeengine/shared/we_config.cpp
View File

@ -68,6 +68,7 @@ unsigned Config::m_FilesPerColumnPartition = DEFAULT_FILES_PER_COLUMN_PARTITION;
unsigned Config::m_ExtentsPerSegmentFile = DEFAULT_EXTENTS_PER_SEGMENT_FILE;
int Config::m_BulkProcessPriority = DEFAULT_BULK_PROCESS_PRIORITY;
string Config::m_BulkRollbackDir;
bool Config::m_FastDelete;
unsigned Config::m_MaxFileSystemDiskUsage = DEFAULT_MAX_FILESYSTEM_DISK_USAGE;
unsigned Config::m_NumCompressedPadBlks = DEFAULT_COMPRESSED_PADDING_BLKS;
bool Config::m_ParentOAMModuleFlag = DEFAULT_PARENT_OAM;
@ -185,6 +186,17 @@ void Config::checkReload()
m_BulkRollbackDir += "/rollback";
}
const std::string fastDeleteTemp = cf->getConfig("WriteEngine", "FastDelete");
if (fastDeleteTemp.length() == 0 || boost::iequals(fastDeleteTemp, "false"))
{
m_FastDelete = false;
}
else
{
m_FastDelete = true;
}
//--------------------------------------------------------------------------
// Initialize max disk usage
//--------------------------------------------------------------------------
@ -516,6 +528,20 @@ std::string Config::getBulkRollbackDir()
return m_BulkRollbackDir;
}
/*******************************************************************************
* DESCRIPTION:
* Get the fast delete option
* PARAMETERS:
* none
******************************************************************************/
bool Config::getFastDelete()
{
boost::mutex::scoped_lock lk(fCacheLock);
checkReload();
return m_FastDelete;
}
/*******************************************************************************
* DESCRIPTION:
* Get Max percentage of allowable file system disk usage for each DBRoot

9
writeengine/shared/we_config.h
View File

@ -122,6 +122,14 @@ class Config
*/
EXPORT static std::string getBulkRollbackDir();
/**
* @brief MCOL-5021 Option to enable/disable fast deletes.
* When enabled (option is disabled by default),
* all column extents are indiscriminately invalidated
* and actual delete is only performed on the AUX column.
*/
EXPORT static bool getFastDelete();
/**
* @brief Max percentage of allowable file system disk usage for each DBRoot
*/
@ -187,6 +195,7 @@ class Config
static unsigned m_ExtentsPerSegmentFile; // # extents per segment file
static int m_BulkProcessPriority; // cpimport.bin proc priority
static std::string m_BulkRollbackDir; // bulk rollback meta data dir
static bool m_FastDelete; // fast delete option
static unsigned m_MaxFileSystemDiskUsage; // max file system % disk usage
static unsigned m_NumCompressedPadBlks; // num blks to pad comp chunks
static bool m_ParentOAMModuleFlag; // are we running on parent PM