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MCOL-455 Change resistribute database logic to move all segment files from designated dbroots to others in the system.

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This commit is contained in:
David Hall
2017-01-06 13:04:32 -06:00
parent 30bd422537
commit 600e758539
5 changed files with 414 additions and 291 deletions
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2
writeengine/redistribute/we_redistributecontrol.cpp
View File

@ -413,6 +413,7 @@ bool RedistributeControl::getStartOptions(messageqcpp::ByteStream& bs)
bs >> fOptions;
bs >> n;
fSourceList.clear();
fSourceList.reserve(n);
for (uint32_t i = 0; i < n; i++)
{
@ -420,6 +421,7 @@ bool RedistributeControl::getStartOptions(messageqcpp::ByteStream& bs)
fSourceList.push_back(d);
}
bs >> n;
fDestinationList.clear();
fDestinationList.reserve(n);
for (uint32_t i = 0; i < n; i++)
{

209
writeengine/redistribute/we_redistributecontrolthread.cpp
View File

@ -173,20 +173,23 @@ int RedistributeControlThread::setup()
vector<int>::iterator i = fControl->fSourceList.begin();
for (; i != fControl->fSourceList.end(); i++)
{
// fSourceSet.insert(*i);
fSourceSet.insert(*i);
fDbrootSet.insert(*i);
if (*i > fMaxDbroot)
fMaxDbroot = *i;
}
// vector<int>::iterator j = fControl->fDestinationList.begin();
// for (; j != fControl->fDestinationList.end(); j++)
// {
// fTargetSet.insert(*j);
// fDbrootSet.insert(*j);
vector<int>::iterator j = fControl->fDestinationList.begin();
for (; j != fControl->fDestinationList.end(); j++)
{
fTargetSet.insert(*j);
if (fDbrootSet.find(*j) == fDbrootSet.end())
{
fDbrootSet.insert(*j);
}
// if (*j > fMaxDbroot)
// fMaxDbroot = *j;
// }
}
}
catch (const std::exception& ex)
{
@ -262,9 +265,9 @@ int RedistributeControlThread::makeRedistributePlan()
j != partitionMap.end(); j++)
{
int dbroot = j->first.dbroot;
if (fDbrootSet.find(dbroot) != fDbrootSet.end())
if (fSourceSet.find(dbroot) != fSourceSet.end())
{
// only dbroot in source and target list needs attention
// only dbroot in source list needs attention
dbPartVec[dbroot].push_back(j->first.partition);
if (j->first.partition > maxPartitionId)
@ -274,98 +277,167 @@ int RedistributeControlThread::makeRedistributePlan()
}
}
// sort the partition
// sort the partitions
for (vector<vector<int> >::iterator k = dbPartVec.begin(); k != dbPartVec.end(); k++)
sort(k->begin(), k->end());
// divide the dbroots into the source and target sets
uint64_t average = totalPartitionCount / fDbrootSet.size();
uint64_t remainder = totalPartitionCount % fDbrootSet.size();
uint64_t average = totalPartitionCount / fTargetSet.size();
// Remainder is the number of partitions that must be spread across some
// of the dbroots such that no dbroot has more than average+1 partitions.
uint64_t remainder = totalPartitionCount % fTargetSet.size();
set<int> sourceDbroots;
set<int> targetDbroots;
// list<pair<size_t, int> > targetList; // to be ordered by partition size
int64_t extra = remainder;
for (set<int>::iterator j = fDbrootSet.begin(); j != fDbrootSet.end(); ++j)
{
if (fTargetSet.find(*j) == fTargetSet.end())
{
// Not a target (removed on command line). Always a source.
sourceDbroots.insert(*j);
continue;
}
// If a dbroot has exactly average+1 partitions and there's extras to be had,
// then it is neither a source nor a target.
if ((dbPartVec[*j].size() == average+1) && extra)
{
--extra;
continue;
}
if (dbPartVec[*j].size() > average)
{
// the last partition is not a candidate for redistribute.
dbPartVec[*j].pop_back();
// Sources are those dbroots with more than average partitions
sourceDbroots.insert(*j);
}
else if (dbPartVec[*j].size() <= average)
else
{
// Targets are those with room ( <= average )
targetDbroots.insert(*j);
}
}
// At this point, there are two concepts of target. (1)Those fTargetSet, which is the
// set of dbroots the user wants partitions on and (2) those in targetDbroots, a subset of
// fTargetSet, which is those that actually have room, based on average, for more data.
// After redistribution, partition # is in [average, average+1].
// When remainder > # of source, some target will have (average+1) partitions.
int64_t extra = ((int64_t) remainder) - ((int64_t) sourceDbroots.size());
// After redistribution, partition count for each dbroot is average or average+1.
// When remainder > 0, some targets will have (average+1) partitions.
// loop through target dbroots
set<int>::iterator k = sourceDbroots.begin();
// loop through target dbroots and find partitions from sources to move to each.
set<int>::iterator sourceDbroot = sourceDbroots.begin();
int sourceCnt = sourceDbroots.size();
for (set<int>::iterator j = targetDbroots.begin(); j != targetDbroots.end(); j++)
for (set<int>::iterator targetDbroot = targetDbroots.begin();
targetDbroot != targetDbroots.end();
++targetDbroot)
{
// check if this target will have average + 1 partitions.
uint64_t e = 0;
if (extra-- > 0)
e = 1;
// the partitions already on the target dbroot
set<int> parts(dbPartVec[*j].begin(), dbPartVec[*j].end());
if (parts.size() >= (average+e))
continue; // no need to move any partition to this target
// A set of the partitions already on the target. We try not to move the same partition here.
set<int> targetParts(dbPartVec[*targetDbroot].begin(), dbPartVec[*targetDbroot].end());
if (targetParts.size() >= (average+e))
continue; // Don't move any partitions to this target
// partitions to be moved to this target
vector<PartitionInfo> planVec;
// looking for source partitions start from partition1
bool done = false; // if target got enough partitions
int loop = 0; // avoid infinity loop, if possible
while (!done && loop < maxPartitionId)
// looking for source partitions start from partition 0
bool done = false; // if target got enough partitions, set to true.
int loop = 0; // avoid infinite loop. maxPartitionId is the last partition of one of the dbroots. It's a place to stop if all else fails.
while (!done && loop <= maxPartitionId)
{
// maxPartitionId is the last partition of one of the dbroots, not a candidate.
for (int p = loop++; p < maxPartitionId && !done; p++)
for (int p = loop++; p <= maxPartitionId && !done; ++p)
{
bool found = false;
if (parts.find(p) == parts.end())
if (targetParts.find(p) == targetParts.end()) // True if the partition is not on the target already
{
// try to find p in one of the source
// try to find partition p in one of the source dbroots
for (int x = 0; x < sourceCnt && !found; ++x)
{
vector<int>& v = dbPartVec[*k];
if (v.size() >= average)
vector<int>& sourceParts = dbPartVec[*sourceDbroot];
// This partition needs to move if:
// 1) source still has more than average partitions, or
// 2) source is not a listed target (we want to empty source).
bool bNotTarget = fTargetSet.find(*sourceDbroot) == fTargetSet.end(); // true if source not in target list
if (sourceParts.size() >= average || bNotTarget)
{
vector<int>::iterator y = find(v.begin(), v.end(), p);
if ((y != v.end()) &&
(v.size() > parts.size())) // @bug4840, tie-break.
vector<int>::iterator y = find(sourceParts.begin(), sourceParts.end(), p);
if ((y != sourceParts.end()) &&
(sourceParts.size() > targetParts.size() || bNotTarget))
{
parts.insert(p);
planVec.push_back(PartitionInfo(*k, p));
targetParts.insert(p);
planVec.push_back(PartitionInfo(*sourceDbroot, p));
found = true;
// update the source
v.erase(y);
sourceParts.erase(y);
}
}
if (++k == sourceDbroots.end())
k = sourceDbroots.begin();
if (++sourceDbroot == sourceDbroots.end())
sourceDbroot = sourceDbroots.begin();
} // for source
if (parts.size() >= (average+e))
if (targetParts.size() == (average+e))
done = true;
} // !find p
} // for p
} // while loop
// dump the plan for the target to file
dumpPlanToFile(i->first, planVec, *j);
dumpPlanToFile(i->first, planVec, *targetDbroot);
} // for target
} // for tables
// It's possible that a source that is "removed" on the command line is not empty.
// This can happen if a partition exists on all dbroots.
// Loop through the sources, looking for dbroots that are not targets that also still contain partitions
for (set<int>::iterator sourceDbroot = sourceDbroots.begin();
sourceDbroot != sourceDbroots.end();
++sourceDbroot)
{
// Is this source in target list? If so, do nothing.
if (fTargetSet.find(*sourceDbroot) != fTargetSet.end())
continue;
vector<int>& sourceParts = dbPartVec[*sourceDbroot]; // Partitions still on source
// We can't erase from a vector we're iterating, so we need a kludge:
for (int p = 0; p <= maxPartitionId; ++p)
{
vector<int>::iterator sourcePart = find(sourceParts.begin(), sourceParts.end(), p);
if (sourcePart == sourceParts.end())
{
continue;
}
// Look through targets to see which can accept this partition. Find the one with the least
// number of partitions. Someday we want to put with the dbroot having the fewest segments of
// the partition.
uint64_t partCount = std::numeric_limits<uint64_t>::max();
int tdbroot = 0;
for (set<int>::iterator targetDbroot = targetDbroots.begin();
targetDbroot != targetDbroots.end();
++targetDbroot)
{
if (dbPartVec[*targetDbroot].size() < partCount)
{
tdbroot = *targetDbroot;
}
}
if (tdbroot == 0)
{
continue;
}
set<int> targetParts(dbPartVec[tdbroot].begin(), dbPartVec[tdbroot].end());
vector<PartitionInfo> planVec; // partitions to be moved to this target
targetParts.insert(p);
planVec.push_back(PartitionInfo(*sourceDbroot, p));
sourceParts.erase(sourcePart);
dumpPlanToFile(i->first, planVec, tdbroot);
} // for sourceParts
} // for source
} // for tables
}
catch (const std::exception& ex)
{
@ -376,11 +448,10 @@ int RedistributeControlThread::makeRedistributePlan()
{
ret = 2;
}
displayPlan();
return ret;
}
void RedistributeControlThread::dumpPlanToFile(uint64_t oid, vector<PartitionInfo>& vec, int target)
{
// open the plan file, if not already opened, to write.
@ -421,6 +492,46 @@ void RedistributeControlThread::dumpPlanToFile(uint64_t oid, vector<PartitionInf
fEntryCount += entryNum;
}
void RedistributeControlThread::displayPlan()
{
// start from the first entry
rewind(fControl->fPlanFilePtr);
ByteStream bs;
uint32_t entryId = 0;
long entrySize = sizeof(RedistributePlanEntry);
fControl->logMessage(string("Redistribution Plan:"));
while (entryId++ < fEntryCount)
{
try
{
RedistributePlanEntry entry;
errno = 0;
size_t n = fread(&entry, entrySize, 1, fControl->fPlanFilePtr);
if (n != 1)
{
int e = errno;
ostringstream oss;
oss << "Failed to read from redistribute.plan: " << strerror(e) << " (" << e << ")";
throw runtime_error(oss.str());
}
// Print this plan entry
ostringstream oss;
oss << "table oid " << entry.table << " partition " << entry.partition
<< " moves from dbroot " << entry.source << " to " << entry.destination << endl;
fControl->logMessage(oss.str());
}
catch (std::exception &e)
{
cout << "exception during display of plan: " << e.what() << endl;
}
catch (...)
{
cout << "exception during display of plan" << endl;
}
}
}
int RedistributeControlThread::executeRedistributePlan()
{

4
writeengine/redistribute/we_redistributecontrolthread.h
View File

@ -99,7 +99,7 @@ class RedistributeControlThread
int connectToWes(int);
void dumpPlanToFile(uint64_t, vector<PartitionInfo>&, int);
void displayPlan();
uint32_t fAction;
oam::OamCache* fOamCache;
@ -108,7 +108,7 @@ class RedistributeControlThread
std::set<int> fSourceSet;
std::set<int> fTargetSet;
std::set<int> fDbrootSet;
std::set<int> fDbrootSet; // Union of fSourceSet and fTargetSet
int fMaxDbroot;
uint32_t fEntryCount;
std::string fErrorMsg;

5
writeengine/redistribute/we_redistributeworkerthread.cpp
View File

@ -356,6 +356,7 @@ int RedistributeWorkerThread::buildEntryList()
if (firstOid)
fSegments.insert(j->segmentNum);
}
#if 0
else if (j->dbRoot == target && j->partitionNum == partition)
{
// the partition already exists on the target dbroot
@ -367,7 +368,7 @@ int RedistributeWorkerThread::buildEntryList()
logMessage(fErrorMsg, __LINE__);
return fErrorCode;
}
#endif
// workaround for HWM_0 of highest extents of the oid on target dbroot.
if (j->dbRoot == target)
{
@ -1235,7 +1236,7 @@ void RedistributeWorkerThread::handleDataStart(SBS& sbs, size_t& size)
ostringstream oss;
oss << "=>redistributing: " << fileName << ", oid=" << dc.oid << ", db=" << dc.dbroot
<< ", part=" << dc.partition << ", seg=" << dc.segment << " from db="
<< fMsgHeader.destination; // fMsgHeader has swapped source and destination.
<< fMsgHeader.source;
logMessage(oss.str(), __LINE__);
}
else

485
writeengine/server/WriteEngineServer.vpj
View File

@ -1,241 +1,250 @@
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