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560 lines
18 KiB
C++
560 lines
18 KiB
C++
/* 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_dbrootextenttracker.cpp 3672 2012-03-26 12:31:27Z rdempsey $
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*/
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#include <unistd.h>
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#include <algorithm>
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#include <sstream>
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#include <boost/scoped_ptr.hpp>
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#include "dbrm.h"
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#include "batchloader.h"
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using namespace std;
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using namespace boost;
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using namespace BRM;
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using namespace oam;
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using namespace execplan;
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namespace batchloader
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{
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//------------------------------------------------------------------------------
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// ChooseStartLoadPM constructor
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//
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// Mutex lock not needed in this function as it is only called from main thread
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//------------------------------------------------------------------------------
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BatchLoader::BatchLoader ( uint32_t tableOid,
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execplan::CalpontSystemCatalog::SCN sessionId,
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std::vector<uint32_t>& PMs )
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{
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fFirstPm=0;
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fNextIdx=0;
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fPMs = PMs;
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fSessionId = sessionId;
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fTableOid = tableOid;
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OamCache * oamcache = OamCache::makeOamCache();
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oam::OamCache::PMDbrootsMap_t systemPmDbrootMap = oamcache->getPMToDbrootsMap();
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std::map<int, OamCache::dbRoots>::iterator iter = systemPmDbrootMap->begin();
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//cout << "fPMs size is " << fPMs.size() << endl;
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fPmDbrootMap.reset(new OamCache::PMDbrootsMap_t::element_type());
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fDbrootPMmap.reset(new map<int, int>());
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for (uint32_t i=0; i < fPMs.size(); i++)
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{
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iter = systemPmDbrootMap->find(fPMs[i]);
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if (iter != systemPmDbrootMap->end())
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{
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fDbRoots.insert(fDbRoots.end(), (iter->second).begin(), (iter->second).end());
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(*fPmDbrootMap)[fPMs[i]] = iter->second;
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}
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}
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//Build dbroot to PM map
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for (iter = fPmDbrootMap->begin(); iter != fPmDbrootMap->end(); iter++)
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{
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for ( uint32_t i = 0; i < iter->second.size(); i++)
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{
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(*fDbrootPMmap)[iter->second[i]] = iter->first;
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}
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}
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}
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//------------------------------------------------------------------------------
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// Select the first PM to send the first batch of rows.
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/*Look up extent map to decide which dbroot to start
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1. If newly created table, starts from the pm where the abbreviated extent created.
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2. If the abbreviated extent has hwm > 0, and other PMs don't have any extent, start from next PM on the list.
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2.5If some DBRoots have extents and some don't the DBRoot with the fewest extents or blocks is chosen,
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"unless" the partition 0, segment 0 extent is one of the HWM extents. In that case the partition 0,
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segment 0 extent still takes precedence.
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3. If all PMs have extents, count the number of extents under each dbroot, find the dbroot which has the least extents to start
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4. If all dbroots have same number of extents, starts from the dbroot which has least number of blocks
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*/
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//------------------------------------------------------------------------------
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void BatchLoader::selectFirstPM ( uint32_t& PMId)
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{
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boost::shared_ptr<CalpontSystemCatalog> systemCatalogPtr = CalpontSystemCatalog::makeCalpontSystemCatalog(fSessionId);
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//cout << "calling tableName for oid " << fTableOid << endl;
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CalpontSystemCatalog::TableName aTableName = systemCatalogPtr->tableName(fTableOid);
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CalpontSystemCatalog::RIDList ridList;
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ridList = systemCatalogPtr->columnRIDs(aTableName, true); //exception will be handled in caller program.
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scoped_ptr<DBRM> dbrmp(new DBRM());
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//Build distVec, start from the PM where the table is created. If not in the PM list, 0 will be used.
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uint16_t createdDbroot = 0;
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int rc = 0;
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std::vector<BRM::EmDbRootHWMInfo_v> allInfo (fPMs.size());
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for (unsigned i = 0; i < fPMs.size(); i++)
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{
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rc = dbrmp->getDbRootHWMInfo((ridList[0].objnum), fPMs[i], allInfo[i]);
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if ( rc !=0 ) //@Bug 4760
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break;
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}
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if ( rc != 0 ) {
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ostringstream oss;
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oss << "There is no extent information for table " << aTableName.table;
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throw std::runtime_error(oss.str());
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}
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uint32_t numDbroot = fDbRoots.size();
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if (numDbroot == 0)
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{
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throw std::runtime_error("There are no dbroots found during selectFirstPM");
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}
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uint64_t* rootExtents = (uint64_t*)alloca((numDbroot + 1) * sizeof(uint64_t)); //array of number extents for each dbroot
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for (unsigned i = 0; i < fDbRoots.size(); i++)
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{
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uint64_t numExtents;
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dbrmp->getExtentCount_dbroot((ridList[0].objnum), fDbRoots[i],
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false, numExtents);
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rootExtents[fDbRoots[i]] = numExtents;
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}
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bool startDBRootSet = false;
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uint64_t* rootBlocks = (uint64_t*)alloca((numDbroot + 1) * sizeof(uint64_t)); //array of number of blocks for the last partition for each dbroot
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//cout << "allInfo size is " << allInfo.size() << endl;
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//--------------------------------------------------------------------------
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// Load rootBlocks to carry total blocks for each DBRoot
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// Set startDBRootSet if the partition 0 segment 0 extent is empty
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// Set createdDbroot for the DBRoot that carries the partition 0
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// segment 0 extent (used to set the default PMId)
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//--------------------------------------------------------------------------
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for (unsigned i=0; i < allInfo.size(); i++) //All PMs
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{
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BRM::EmDbRootHWMInfo_v emDbRootHWMInfos = allInfo[i]; //one pm
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for (unsigned j=0; j < emDbRootHWMInfos.size(); j++)
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{
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if (emDbRootHWMInfos[j].totalBlocks == 0) {
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//cout << "totalBlocks is 0" << endl;
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continue; }
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//------------------------------------------------------------------
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// Ignore partition 0, segment 0 HWM extent if it is disabled
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//------------------------------------------------------------------
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if ((emDbRootHWMInfos[j].partitionNum == 0) &&
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(emDbRootHWMInfos[j].segmentNum ==0) &&
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(emDbRootHWMInfos[j].status != BRM::EXTENTOUTOFSERVICE))
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{
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if (emDbRootHWMInfos[j].localHWM == 0)
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{
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//newly created table
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//cout << " This is newly created table. PM id is " << PMId;
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startDBRootSet = true;
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createdDbroot = emDbRootHWMInfos[j].dbRoot;
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break;
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}
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else
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{
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createdDbroot = emDbRootHWMInfos[j].dbRoot;
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//cout << " and createdDbroot is " << createdDbroot << endl;
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rootBlocks[emDbRootHWMInfos[j].dbRoot] = emDbRootHWMInfos[j].totalBlocks;
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}
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}
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else
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{
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rootBlocks[emDbRootHWMInfos[j].dbRoot] = emDbRootHWMInfos[j].totalBlocks;
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}
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}
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if (startDBRootSet)
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break;
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}
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//--------------------------------------------------------------------------
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// Set the default PMId to the PM with the partition 0 segment 0 extent
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//--------------------------------------------------------------------------
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PMId = 0;
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if ( createdDbroot != 0)
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{
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std::map<int, int>::iterator iter = fDbrootPMmap->begin();
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iter = fDbrootPMmap->find(createdDbroot);
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if (iter != fDbrootPMmap->end())
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PMId = iter->second;
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}
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// This will build the batch distribution sequence
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//cout << "Building BatchDistSeqVector with PMId " << PMId << endl;
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buildBatchDistSeqVector(PMId);
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//cout << "startDBRootSet = " << startDBRootSet << endl;
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bool allEqual = true;
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bool allOtherDbrootEmpty = true;
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//--------------------------------------------------------------------------
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// startDBRootSet == false
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// We don't have an empty partition 0, segment 0 extent to load;
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// so evaluate more selection criteria.
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//--------------------------------------------------------------------------
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if (!startDBRootSet)
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{
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std::vector<PMRootInfo> rootsExtentsBlocks;
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std::map<int, OamCache::dbRoots>::iterator iter;
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//----------------------------------------------------------------------
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// Load rootsExtentsBlocks to carry the number of extents and blocks
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// for each DBRoot.
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//----------------------------------------------------------------------
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for (unsigned j=0; j < fPmDistSeq.size(); j++)
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{
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PMRootInfo aEntry;
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aEntry.PMId = fPmDistSeq[j];
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iter = fPmDbrootMap->find(aEntry.PMId);
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for (unsigned k=0; k < (iter->second).size(); k++)
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{
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RootExtentsBlocks aRootInfo;
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aRootInfo.DBRoot = (iter->second)[k];
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aRootInfo.numExtents = rootExtents[aRootInfo.DBRoot];
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aRootInfo.numBlocks = rootBlocks[aRootInfo.DBRoot];
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//cout << "aRootInfo DBRoot:numExtents:numBlocks = " << aRootInfo.DBRoot<<":"<<aRootInfo.numExtents<<":"<<aRootInfo.numBlocks<<endl;
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aEntry.rootInfo.push_back(aRootInfo);
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}
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rootsExtentsBlocks.push_back(aEntry);
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}
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//cout << "rootsExtentsBlocks size is " << rootsExtentsBlocks.size() << " and allOtherDbrootEmpty is " << allOtherDbrootEmpty<< endl;
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//----------------------------------------------------------------------
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// See if all other DBRoots other than the createdDbroot have 0 extents
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//----------------------------------------------------------------------
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for (unsigned i=1; i < rootsExtentsBlocks.size(); i++)
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{
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if (!allOtherDbrootEmpty)
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break;
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//cout << "createdDbroot is " << createdDbroot << endl;
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if (i != createdDbroot)
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{
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for ( unsigned j=0; j < rootsExtentsBlocks[i].rootInfo.size(); j++)
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{
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if (rootsExtentsBlocks[i].rootInfo[j].numExtents != 0)
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{
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//cout << "setting allOtherDbrootEmpty to false and i:j = " << i<<":"<<j<<endl;
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//cout << "numExtents = " << rootsExtentsBlocks[i].rootInfo[j].numExtents << endl;
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allOtherDbrootEmpty = false;
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break;
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}
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}
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}
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}
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//cout << "allOtherDbrootEmpty is " << allOtherDbrootEmpty << endl;
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//----------------------------------------------------------------------
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// allOtherDbrootEmpty == true
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// No DBRoots (other than the DBRoot having the partition 0,
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// segment 0 extent) have extents
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//----------------------------------------------------------------------
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if (allOtherDbrootEmpty)
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{
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//find the next PM id on the list
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startDBRootSet = true;
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buildBatchDistSeqVector();
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allEqual = false;
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}
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//----------------------------------------------------------------------
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// allOtherDbrootEmpty == false
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// Some DBRoots (other than the DBRoot having the partition 0,
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// segment 0 extent) have extents. More evaluation necessary.
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//----------------------------------------------------------------------
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else //find the dbroot which has the least extents to start
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{
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//cout << "finding least dbroot to start." << endl;
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//------------------------------------------------------------------
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// Select PM with DBRoot having the fewest extents.
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//------------------------------------------------------------------
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uint32_t tmpLeastExtents = rootsExtentsBlocks[0].rootInfo[0].numExtents;
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PMId = rootsExtentsBlocks[0].PMId; //@Bug 4809.
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for ( unsigned j=1; j < rootsExtentsBlocks[0].rootInfo.size(); j++)
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{
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if (tmpLeastExtents > rootsExtentsBlocks[0].rootInfo[j].numExtents)
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tmpLeastExtents = rootsExtentsBlocks[0].rootInfo[j].numExtents;
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}
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for (unsigned i=1; i < rootsExtentsBlocks.size(); i++)
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{
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uint32_t leastExtents = rootsExtentsBlocks[i].rootInfo[0].numExtents;
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for ( unsigned j=0; j < rootsExtentsBlocks[i].rootInfo.size(); j++)
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{
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if (leastExtents > rootsExtentsBlocks[i].rootInfo[j].numExtents)
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leastExtents = rootsExtentsBlocks[i].rootInfo[j].numExtents;
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}
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if (leastExtents < tmpLeastExtents)
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{
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tmpLeastExtents = leastExtents;
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PMId = rootsExtentsBlocks[i].PMId;
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allEqual = false;
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}
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else if (leastExtents > tmpLeastExtents)
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allEqual = false;
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}
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//cout << "allEqual is " << allEqual << endl;
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//------------------------------------------------------------------
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// All DBRoots have the same number of extents.
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// Select PM with DBRoot having the fewest number of blocks.
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//------------------------------------------------------------------
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if (allEqual) //Find the dbroot which has least number of blocks
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{
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//cout << "All PMs have equal # of least extents" << endl;
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uint32_t tmpBloks = rootsExtentsBlocks[0].rootInfo[0].numBlocks;
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PMId = rootsExtentsBlocks[0].PMId;
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//cout << "tmpBloks:PMId = " << tmpBloks <<":"<<PMId<<endl;
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for ( unsigned j=1; j < rootsExtentsBlocks[0].rootInfo.size(); j++)
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{
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if (tmpBloks > rootsExtentsBlocks[0].rootInfo[j].numBlocks)
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tmpBloks = rootsExtentsBlocks[0].rootInfo[j].numBlocks;
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}
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for (unsigned i=1; i < rootsExtentsBlocks.size(); i++)
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{
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uint32_t leastBlocks = rootsExtentsBlocks[i].rootInfo[0].numBlocks;
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//cout << "leastBlocks = " << leastBlocks << endl;
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for ( unsigned j=0; j < rootsExtentsBlocks[i].rootInfo.size(); j++)
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{
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if (leastBlocks > rootsExtentsBlocks[i].rootInfo[j].numBlocks)
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leastBlocks = rootsExtentsBlocks[i].rootInfo[j].numBlocks;
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}
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if (leastBlocks < tmpBloks)
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{
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tmpBloks = leastBlocks;
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//cout << "tmpBloks changed to " << tmpBloks << endl;
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PMId = rootsExtentsBlocks[i].PMId;
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//cout << "setting allEqual to false now" << endl;
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allEqual = false;
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}
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}
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}
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}
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}
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//--------------------------------------------------------------------------
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// startDBRootSet == true
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// We select the empty partition 0, segment 0 extent to load
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//--------------------------------------------------------------------------
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else
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{
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allEqual = false;
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}
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fFirstPm = PMId;
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if (!allOtherDbrootEmpty || (PMId == 0))
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{
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prepareForSecondPM();
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//cout << "prepareForSecondPM is called. " << endl;
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}
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if ((allEqual && (PMId == 0)) || allOtherDbrootEmpty)
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{
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PMId = selectNextPM();
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fFirstPm = PMId;
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//cout << "PMId is now " << PMId << endl;
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}
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}
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//------------------------------------------------------------------------------
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/*
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* Build the sequence of distribution as a vector.
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*/
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//------------------------------------------------------------------------------
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void BatchLoader::buildBatchDistSeqVector()
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{
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fPmDistSeq.clear();
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BlIntVec aDbCntVec(fPMs.size());
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std::map<int, OamCache::dbRoots>::iterator iter = fPmDbrootMap->begin();
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for (uint32_t i=0; i < fPMs.size(); i++)
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{
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iter = fPmDbrootMap->find(fPMs[i]);
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if ((iter != fPmDbrootMap->end()) && ((iter->second).begin()!=(iter->second).end()))
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{
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try
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{
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aDbCntVec[i] = (iter->second).size();
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//cout << "PM - "<<fPMs[i] << " Size = " << aDbCntVec[i] << endl;
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}
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catch(std::exception& exp)
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{
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throw runtime_error(exp.what());
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}
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}
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else
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aDbCntVec[i] = 0;
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}
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int aTotDbRoots = 0;
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for (uint32_t i=0; i<aDbCntVec.size(); i++) aTotDbRoots+=aDbCntVec[i];
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int aIdx=0;
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while(aIdx < aTotDbRoots)
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{
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uint32_t aMax=0;
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uint32_t aPmId=0;
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uint32_t aRefIdx=0;
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for (uint32_t i=0; i<aDbCntVec.size(); i++)
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{
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if(aDbCntVec[i] > aMax)
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{
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aMax = aDbCntVec[i];
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aPmId = fPMs[i];
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aRefIdx = i;
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}
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}
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if(aMax>0)
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{
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fPmDistSeq.push_back(aPmId);
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aDbCntVec[aRefIdx]--;
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}
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aIdx++;
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}
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}
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//------------------------------------------------------------------------------
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/*
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* Build the sequence of distribution as a vector.
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*/
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//------------------------------------------------------------------------------
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void BatchLoader::buildBatchDistSeqVector(uint32_t StartPm)
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{
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fPmDistSeq.clear();
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BlIntVec aDbCntVec(fPMs.size());
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BlIntVec aPms;
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if((fPMs.size()==0)&&(StartPm!=0))
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throw runtime_error("ERROR : PM list empty while Start != 0");
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//for (uint32_t i=0; i<fPMs.size(); i++)
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// cout <<"fPM list "<<i <<" = " << fPMs[i] << endl;
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//cout << "StartPm = "<< StartPm << endl;
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if (StartPm == 0)
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aPms = fPMs;
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else
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{
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aPms.push_back(StartPm);
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uint32_t aLast = fPMs.back();
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uint32_t aFirst = fPMs.front();
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// Add all the PMs with index more than "StartPm"
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for(uint32_t i=0; i<fPMs.size(); i++)
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{
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if((fPMs[i]>StartPm)&&(fPMs[i]<=aLast)) aPms.push_back(fPMs[i]);
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}
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// Add all the PMs with index less than "StartPm"
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for(uint32_t i=0; i<fPMs.size(); i++)
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{
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if((fPMs[i]<StartPm)&&(fPMs[i]>=aFirst)) aPms.push_back(fPMs[i]);
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}
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}
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|
|
std::map<int, OamCache::dbRoots>::iterator iter = fPmDbrootMap->begin();
|
|
for (uint32_t i=0; i < aPms.size(); i++)
|
|
{
|
|
iter = fPmDbrootMap->find(aPms[i]);
|
|
if ((iter != fPmDbrootMap->end()) && ((iter->second).begin()!=(iter->second).end()))
|
|
{
|
|
aDbCntVec[i] = (iter->second).size();
|
|
//cout << "PM - "<<aPms[i] << " Size = " << aDbCntVec[i] << endl;
|
|
}
|
|
else
|
|
aDbCntVec[i] = 0;
|
|
}
|
|
|
|
int aTotDbRoots = 0;
|
|
for (uint32_t i=0; i<aDbCntVec.size(); i++) aTotDbRoots+=aDbCntVec[i];
|
|
|
|
//cout << "DbCntVec Size = " << aDbCntVec.size() << " TotDbRoots = "<<aTotDbRoots << endl;
|
|
|
|
int aIdx=0;
|
|
while(aIdx < aTotDbRoots)
|
|
{
|
|
uint32_t aMax=0;
|
|
uint32_t aPmId=0;
|
|
uint32_t aRefIdx=0;
|
|
for (uint32_t i=0; i<aDbCntVec.size(); i++)
|
|
{
|
|
if(aDbCntVec[i] > aMax)
|
|
{
|
|
aMax = aDbCntVec[i];
|
|
aPmId = aPms[i];
|
|
aRefIdx = i;
|
|
}
|
|
}
|
|
if(aMax>0)
|
|
{
|
|
fPmDistSeq.push_back(aPmId);
|
|
aDbCntVec[aRefIdx]--;
|
|
}
|
|
aIdx++;
|
|
}
|
|
|
|
//cout <<"PM Distribution vector size "<< fPmDistSeq.size() << endl;
|
|
//for (uint32_t i=0; i<fPmDistSeq.size(); i++)
|
|
// cout <<"PM Distribution vector "<<i <<" = " << fPmDistSeq[i] << endl;
|
|
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
uint32_t BatchLoader::selectNextPM()
|
|
{
|
|
if(0 == fPmDistSeq.size()) //Dist sequence not ready. First time the function is called
|
|
{
|
|
uint32_t PMId = 0;
|
|
//cout << "selectNextPM: size is 0. " << endl;
|
|
selectFirstPM(PMId);
|
|
return PMId;
|
|
}
|
|
|
|
if(fNextIdx >= fPmDistSeq.size()) fNextIdx=0; //reset it
|
|
return fPmDistSeq[fNextIdx++];
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
void BatchLoader::reverseSequence()
|
|
{
|
|
if(0 == fNextIdx) fNextIdx = fPmDistSeq.size()-1;
|
|
else fNextIdx--;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
void BatchLoader::prepareForSecondPM()
|
|
{
|
|
// We loop thru by calling the selectNextPM()
|
|
// When we get the aSecPm == aFirstPM, we will break so that when
|
|
// we call the same function again when we come back get the next PM
|
|
if((fFirstPm != 0)&&(fPMs.size()>1))
|
|
{
|
|
unsigned int aSecPm = selectNextPM();
|
|
while(fFirstPm!=aSecPm ) aSecPm = selectNextPM();
|
|
}
|
|
}
|
|
|
|
} // end of namespace
|