void LogicalTxnLog::rollbackTxn(SharedLogicalTxn pTxn)
{
if (!pTxn->checkpointed) {
// we never stored a checkpoint record for this txn, so during recovery
// it can be ignored entirely
StrictMutexGuard mutexGuard(mutex);
removeTxn(pTxn);
return;
}
// otherwise, write an EVENT_ROLLBACK so that the txn's fate is known
// during recovery (eliminating the need for multiple passes over the log)
LogicalTxnEventMemento memento;
memento.event = LogicalTxnEventMemento::EVENT_ROLLBACK;
memento.txnId = pTxn->txnId;
memento.cbActionLast = 0;
memento.nParticipants = 0;
CompoundId::setPageId(memento.logPosition.segByteId, NULL_PAGE_ID);
CompoundId::setByteOffset(memento.logPosition.segByteId, 0);
memento.logPosition.cbOffset = 0;
memento.longLog = true;
StrictMutexGuard mutexGuard(mutex);
pOutputStream->writeValue(memento);
// no need for group commit since caller doesn't need to wait for
// commit confirmation
removeTxn(pTxn);
}
void ParallelExecStreamScheduler::executeManager()
{
// TODO jvs 16-Aug-2008: RAII
try {
tryExecuteManager();
} catch (...) {
StrictMutexGuard mutexGuard(mutex);
mgrState = MGR_STOPPED;
sentinelCondition.notify_all();
throw;
}
StrictMutexGuard mutexGuard(mutex);
mgrState = MGR_STOPPED;
sentinelCondition.notify_all();
}
void ParallelExecStreamScheduler::stop()
{
FENNEL_TRACE(TRACE_FINE, "stop");
StrictMutexGuard mutexGuard(mutex);
if (mgrState != MGR_STOPPED) {
mgrState = MGR_STOPPING;
condition.notify_one();
while (mgrState != MGR_STOPPED) {
sentinelCondition.wait(mutexGuard);
}
}
mutexGuard.unlock();
threadPool.stop();
// NOTE jvs 10-Aug-2008: This is how we keep the cloned excn
// from becoming a memory leak. It assumes that the caller
// doesn't invoke pScheduler->stop() until *after* the exception
// has been completely handled and is no longer referenced.
pPendingExcn.reset();
completedQueue.clear();
inhibitedQueue.clear();
}
void ExternalSortExecStreamImpl::unreserveRunLoader(
ExternalSortRunLoader &runLoader)
{
StrictMutexGuard mutexGuard(runLoaderMutex);
runLoader.runningParallelTask = false;
runLoaderAvailable.notify_all();
}
bool SimpleExecStreamGovernor::setResourceAvailability(
ExecStreamResourceQuantity const &available,
ExecStreamResourceType resourceType)
{
StrictMutexGuard mutexGuard(mutex);
switch (resourceType) {
case EXEC_RESOURCE_CACHE_PAGES:
{
uint pagesAvailable =
available.nCachePages
* (100 - knobSettings.cacheReservePercentage)
/ 100;
if (pagesAvailable < resourcesAssigned.nCachePages) {
return false;
}
resourcesAvailable.nCachePages =
(pagesAvailable - resourcesAssigned.nCachePages);
perGraphAllocation = computePerGraphAllocation();
FENNEL_TRACE(
TRACE_FINE,
resourcesAvailable.nCachePages
<< " cache pages now available for assignment. "
<< "Per graph allocation is now " << perGraphAllocation
<< " cache pages.");
break;
}
case EXEC_RESOURCE_THREADS:
resourcesAvailable.nThreads = available.nThreads;
break;
}
return true;
}
void VersionedSegment::delegatedCheckpoint(
Segment &delegatingSegment,CheckpointType checkpointType)
{
if (checkpointType != CHECKPOINT_DISCARD) {
// TODO: for a fuzzy checkpoint, only need to force the log pages for
// data pages that are going to be flushed
logSegment->checkpoint(checkpointType);
assert(pWALSegment->getMinDirtyPageId() == NULL_PAGE_ID);
}
if (checkpointType == CHECKPOINT_FLUSH_FUZZY) {
MappedPageListenerPredicate pagePredicate(delegatingSegment);
fuzzyCheckpointSet.setDelegatePagePredicate(pagePredicate);
pCache->checkpointPages(fuzzyCheckpointSet, checkpointType);
fuzzyCheckpointSet.finishCheckpoint();
if (lastCheckpointLogPageId != NULL_PAGE_ID) {
oldestLogPageId = logSegment->getPageSuccessor(
lastCheckpointLogPageId);
} else {
oldestLogPageId = NULL_PAGE_ID;
}
} else {
DelegatingSegment::delegatedCheckpoint(
delegatingSegment, checkpointType);
fuzzyCheckpointSet.clear();
oldestLogPageId = NULL_PAGE_ID;
}
if (checkpointType == CHECKPOINT_DISCARD) {
logSegment->checkpoint(checkpointType);
}
StrictMutexGuard mutexGuard(mutex);
++versionNumber;
dataToLogMap.clear();
}
void SourceObject::HandleAboutToFinish ()
{
qDebug () << Q_FUNC_INFO;
auto timeoutIndicator = std::make_shared<std::atomic_bool> (false);
NextSrcMutex_.lock ();
if (NextSource_.IsEmpty ())
{
emit aboutToFinish (timeoutIndicator);
NextSrcWC_.wait (&NextSrcMutex_, 500);
}
qDebug () << "wait finished; next source:" << NextSource_.ToUrl ()
<< "; current source:" << CurrentSource_.ToUrl ();
std::shared_ptr<void> mutexGuard (nullptr,
[this] (void*) { NextSrcMutex_.unlock (); });
if (NextSource_.IsEmpty ())
{
*timeoutIndicator = true;
qDebug () << Q_FUNC_INFO
<< "no next source set, will stop playing";
return;
}
SetCurrentSource (NextSource_);
}
void ExternalSortExecStreamImpl::deleteStoredRunInfo(uint iFirstRun, uint nRuns)
{
StrictMutexGuard mutexGuard(storedRunMutex);
storedRuns.erase(
storedRuns.begin() + iFirstRun,
storedRuns.begin() + iFirstRun + nRuns);
}
void SnapshotRandomAllocationSegment::deallocatePageRange(
PageId startPageId,
PageId endPageId)
{
assert(!readOnlyCommittedData);
permAssert(startPageId != NULL_PAGE_ID);
permAssert(startPageId == endPageId);
SXMutexExclusiveGuard mapGuard(modPageMapMutex);
StrictMutexGuard mutexGuard(snapshotPageMapMutex);
// Mark the pages in the page chain as deallocation-deferred. The actual
// deallocation of these pages will be done by an ALTER SYSTEM DEALLOCATE
// OLD.
// Note that we cannot discard snapshot pages from cache because they
// really haven't been freed yet and still may be referenced by other
// threads. The pages will be removed from the cache when they are
// actually freed.
PageId chainPageId = startPageId;
VersionedPageEntry pageEntry;
do {
pVersionedRandomSegment->getLatestPageEntryCopy(chainPageId, pageEntry);
DelegatingSegment::deallocatePageRange(chainPageId, chainPageId);
incrPageUpdateCount(
chainPageId,
ANON_PAGE_OWNER_ID,
ModifiedPageEntry::DEALLOCATED);
snapshotPageMap.erase(chainPageId);
chainPageId = pageEntry.versionChainPageId;
} while (chainPageId != startPageId);
}
void WALSegment::notifyAfterPageFlush(CachePage &page)
{
DelegatingSegment::notifyAfterPageFlush(page);
PageId logPageId = translateBlockId(page.getBlockId());
StrictMutexGuard mutexGuard(mutex);
dirtyPageSet.erase(logPageId);
}
void LogicalTxnLog::checkpoint(
LogicalTxnLogCheckpointMemento &memento,
CheckpointType checkpointType)
{
StrictMutexGuard mutexGuard(mutex);
if (checkpointType == CHECKPOINT_DISCARD) {
uncommittedTxns.clear();
committedLongLogSegments.clear();
return;
}
pOutputStream->getSegPos(memento.logPosition);
memento.nUncommittedTxns = uncommittedTxns.size();
memento.nextTxnId = nextTxnId;
std::for_each(
uncommittedTxns.begin(),
uncommittedTxns.end(),
boost::bind(&LogicalTxnLog::checkpointTxn,this,_1));
pOutputStream->hardPageBreak();
logSegmentAccessor.pSegment->checkpoint(checkpointType);
if (checkpointType == CHECKPOINT_FLUSH_FUZZY) {
// memento gets lastCheckpointMemento, and lastCheckpointMemento gets
// new memento just created above
std::swap(memento, lastCheckpointMemento);
}
}
void ParallelExecStreamScheduler::tryExecuteManager()
{
FENNEL_TRACE(TRACE_FINE, "manager task starting");
for (;;) {
StrictMutexGuard mutexGuard(mutex);
while (completedQueue.empty() && (mgrState == MGR_RUNNING)
&& !pPendingExcn)
{
condition.wait(mutexGuard);
}
if (pPendingExcn) {
return;
}
if (mgrState != MGR_RUNNING) {
return;
}
while (!completedQueue.empty()) {
ParallelExecResult result = completedQueue.front();
completedQueue.pop_front();
// don't hold lock while doing expensive state maintenance
mutexGuard.unlock();
processCompletedTask(result);
if (pPendingExcn) {
return;
}
mutexGuard.lock();
}
}
}
void WALSegment::notifyPageDirty(CachePage &page,bool bDataValid)
{
DelegatingSegment::notifyPageDirty(page, bDataValid);
PageId logPageId = translateBlockId(
page.getBlockId());
StrictMutexGuard mutexGuard(mutex);
dirtyPageSet.insert(dirtyPageSet.end(), logPageId);
}
void ParallelExecStreamScheduler::signalSentinel(ExecStreamId sentinelId)
{
alterNeighborInhibition(sentinelId, + 1);
StrictMutexGuard mutexGuard(mutex);
streamStateMap[sentinelId].state = SS_RUNNING;
sentinelCondition.notify_all();
}
void DynamicParamManager::deleteParam(DynamicParamId dynamicParamId)
{
StrictMutexGuard mutexGuard(mutex);
assert(paramMap.find(dynamicParamId) != paramMap.end());
paramMap.erase(dynamicParamId);
assert(paramMap.find(dynamicParamId) == paramMap.end());
}
void LogicalTxnLog::commitTxn(SharedLogicalTxn pTxn)
{
LogicalTxnEventMemento memento;
memento.event = LogicalTxnEventMemento::EVENT_COMMIT;
memento.txnId = pTxn->txnId;
memento.cbActionLast = pTxn->svpt.cbActionPrev;
memento.nParticipants = pTxn->participants.size();
SharedSegment pSegment = pTxn->pOutputStream->getSegment();
if (pSegment) {
assert(pTxn->pOutputStream.unique());
pTxn->pOutputStream->hardPageBreak();
pTxn->pOutputStream->getSegOutputStream()->getSegPos(
memento.logPosition);
pTxn->pOutputStream.reset();
pSegment->checkpoint(CHECKPOINT_FLUSH_AND_UNMAP);
StrictMutexGuard mutexGuard(mutex);
committedLongLogSegments.push_back(pSegment);
} else {
if (!pTxn->svpt.cbLogged) {
// NOTE jvs 27-Feb-2006: "empty commit" is an important
// optimization for queries in autocommit mode, where JDBC
// specifies a commit whenever a cursor is closed.
StrictMutexGuard mutexGuard(mutex);
removeTxn(pTxn);
return;
}
CompoundId::setPageId(memento.logPosition.segByteId, NULL_PAGE_ID);
CompoundId::setByteOffset(
memento.logPosition.segByteId,
pTxn->svpt.cbLogged);
memento.logPosition.cbOffset = pTxn->svpt.cbLogged;
}
memento.longLog = pSegment ? true : false;
StrictMutexGuard mutexGuard(mutex);
pOutputStream->writeValue(memento);
if (!pSegment) {
SharedByteInputStream pInputStream =
pTxn->pOutputStream->getInputStream();
uint cbActual;
PConstBuffer pBuffer = pInputStream->getReadPointer(1,&cbActual);
pOutputStream->writeBytes(pBuffer, cbActual);
}
commitTxnWithGroup(mutexGuard);
removeTxn(pTxn);
}
PageId WALSegment::getMinDirtyPageId() const
{
StrictMutexGuard mutexGuard(mutex);
if (dirtyPageSet.empty()) {
return NULL_PAGE_ID;
}
PageId minDirtyPageId = *(dirtyPageSet.begin());
return minDirtyPageId;
}
void DynamicParamManager::decrementCounterParam(DynamicParamId dynamicParamId)
{
StrictMutexGuard mutexGuard(mutex);
DynamicParam ¶m = getParamInternal(dynamicParamId);
assert(param.isCounter);
int64_t *pCounter = reinterpret_cast<int64_t *>(param.pBuffer.get());
(*pCounter)--;
}
void ParallelExecStreamScheduler::abort(ExecStreamGraph &graph)
{
StrictMutexGuard mutexGuard(mutex);
FENNEL_TRACE(TRACE_FINE, "abort requested");
if (!pPendingExcn) {
pPendingExcn.reset(new AbortExcn());
}
condition.notify_one();
}
void ParallelExecStreamScheduler::tryExecuteTask(ExecStream &stream)
{
ExecStreamQuantum quantum;
ExecStreamResult rc = executeStream(stream, quantum);
ParallelExecResult result(stream.getStreamId(), rc);
StrictMutexGuard mutexGuard(mutex);
completedQueue.push_back(result);
condition.notify_one();
}
void ParallelExecStreamScheduler::executeTask(ExecStream &stream)
{
try {
tryExecuteTask(stream);
} catch (std::exception &ex) {
StrictMutexGuard mutexGuard(mutex);
if (!pPendingExcn) {
pPendingExcn.reset(threadTracker.cloneExcn(ex));
}
condition.notify_one();
} catch (...) {
// REVIEW jvs 22-Jul-2008: panic instead?
StrictMutexGuard mutexGuard(mutex);
if (!pPendingExcn) {
pPendingExcn.reset(new FennelExcn("Unknown error"));
}
condition.notify_one();
}
}
void DynamicParamManager::createParam(
DynamicParamId dynamicParamId,
const TupleAttributeDescriptor &attrDesc,
bool failIfExists)
{
StrictMutexGuard mutexGuard(mutex);
SharedDynamicParam param(new DynamicParam(attrDesc));
createParam(dynamicParamId, param, failIfExists);
}
void VersionedSegment::prepareOnlineRecovery()
{
// For simplicity, force entire log out to disk first, but don't discard
// it, since we're about to read it during recovery.
logSegment->checkpoint(CHECKPOINT_FLUSH_ALL);
StrictMutexGuard mutexGuard(mutex);
dataToLogMap.clear();
oldestLogPageId = NULL_PAGE_ID;
}
void DynamicParamManager::writeParam(
DynamicParamId dynamicParamId, const TupleDatum &src)
{
StrictMutexGuard mutexGuard(mutex);
DynamicParam ¶m = getParamInternal(dynamicParamId);
if (src.pData) {
assert(src.cbData <= param.getDesc().cbStorage);
}
param.datum.pData = param.pBuffer.get();
param.datum.memCopyFrom(src);
}
void ExternalSortExecStreamImpl::storeRun(ExternalSortSubStream &subStream)
{
FENNEL_TRACE(
TRACE_FINE,
"storing run " << storedRuns.size());
boost::scoped_ptr<ExternalSortRunAccessor> pRunAccessor;
pRunAccessor.reset(new ExternalSortRunAccessor(sortInfo));
pRunAccessor->storeRun(subStream);
StrictMutexGuard mutexGuard(storedRunMutex);
storedRuns.push_back(pRunAccessor->getStoredRun());
}
ExternalSortRunLoader &ExternalSortExecStreamImpl::reserveRunLoader()
{
StrictMutexGuard mutexGuard(runLoaderMutex);
for (;;) {
for (uint i = 0; i < nParallel; ++i) {
ExternalSortRunLoader &runLoader = *(runLoaders[i]);
if (!runLoader.runningParallelTask) {
runLoader.runningParallelTask = true;
return runLoader;
}
}
runLoaderAvailable.wait(mutexGuard);
}
}
PageId SnapshotRandomAllocationSegment::getSnapshotId(PageId pageId)
{
StrictMutexGuard mutexGuard(snapshotPageMapMutex);
// If possible, use the mapping we've previously cached
PageMapConstIter pSnapshotPageId = snapshotPageMap.find(pageId);
if (pSnapshotPageId != snapshotPageMap.end()) {
return pSnapshotPageId->second;
}
VersionedPageEntry pageEntry;
pVersionedRandomSegment->getLatestPageEntryCopy(pageId, pageEntry);
// Handle the special case where there's no chain
if (pageEntry.versionChainPageId == pageId) {
assert(snapshotCsn >= pageEntry.allocationCsn);
snapshotPageMap[pageId] = pageId;
return pageId;
}
// If we have to walk through the page chain, then we need to be starting
// from the anchor. Note that there's no need to acquire the deallocation
// mutex while walking through the page chain looking for the appropriate
// snapshot page because we always start at the anchor and walk from
// newer pages to older pages. Therefore, we should never try reading
// the pageEntry for an older page that's going to be deallocated.
assert(pageId == getAnchorPageId(pageId));
PageId chainPageId = pageEntry.versionChainPageId;
do {
pVersionedRandomSegment->getLatestPageEntryCopy(chainPageId, pageEntry);
if (snapshotCsn >= pageEntry.allocationCsn) {
// only consider uncommitted pageEntry's if they correspond to
// the current txn
if ((!readOnlyCommittedData
&& pageEntry.ownerId == UNCOMMITTED_PAGE_OWNER_ID
&& snapshotCsn == pageEntry.allocationCsn)
|| pageEntry.ownerId != UNCOMMITTED_PAGE_OWNER_ID)
{
snapshotPageMap[pageId] = chainPageId;
return chainPageId;
}
}
// permAssert to prevent an infinite loop
permAssert(chainPageId != pageId);
chainPageId = pageEntry.versionChainPageId;
} while (true);
}
bool SimpleExecStreamGovernor::setResourceKnob(
ExecStreamResourceKnobs const &knob, ExecStreamResourceKnobType knobType)
{
StrictMutexGuard mutexGuard(mutex);
switch (knobType) {
case EXEC_KNOB_EXPECTED_CONCURRENT_STATEMENTS:
knobSettings.expectedConcurrentStatements =
knob.expectedConcurrentStatements;
perGraphAllocation = computePerGraphAllocation();
FENNEL_TRACE(
TRACE_FINE,
"Expected concurrent statements set to "
<< knobSettings.expectedConcurrentStatements
<< ". Per graph allocation is now " << perGraphAllocation
<< " cache pages.");
break;
case EXEC_KNOB_CACHE_RESERVE_PERCENTAGE:
// make sure we have enough unassigned pages to set aside the new
// reserve amount
double percent = (100 - knobSettings.cacheReservePercentage) / 100.0;
uint totalPagesAvailable = (uint)
((resourcesAvailable.nCachePages + resourcesAssigned.nCachePages)
/ percent);
uint numReserve =
totalPagesAvailable * knob.cacheReservePercentage / 100;
if (totalPagesAvailable - numReserve < resourcesAssigned.nCachePages) {
return false;
}
knobSettings.cacheReservePercentage = knob.cacheReservePercentage;
resourcesAvailable.nCachePages =
totalPagesAvailable - numReserve - resourcesAssigned.nCachePages;
perGraphAllocation = computePerGraphAllocation();
FENNEL_TRACE(
TRACE_FINE,
"Cache reserve percentage set to "
<< knobSettings.cacheReservePercentage
<< ". Per graph allocation is now " << perGraphAllocation
<< " cache pages.");
break;
}
return true;
}
ExecStreamBufAccessor &ParallelExecStreamScheduler::readStream(
ExecStream &stream)
{
FENNEL_TRACE(
TRACE_FINE,
"entering readStream " << stream.getName());
ExecStreamId current = stream.getStreamId();
ExecStreamGraphImpl &graphImpl =
dynamic_cast<ExecStreamGraphImpl&>(*pGraph);
ExecStreamGraphImpl::GraphRep const &graphRep = graphImpl.getGraphRep();
// assert that we're reading from a designated output stream
assert(boost::out_degree(current, graphRep) == 1);
ExecStreamGraphImpl::Edge edge =
*(boost::out_edges(current,graphRep).first);
ExecStreamBufAccessor &bufAccessor = graphImpl.getBufAccessorFromEdge(edge);
current = boost::target(edge, graphRep);
assert(!graphImpl.getStreamFromVertex(current));
if (bufAccessor.getState() == EXECBUF_EMPTY) {
bufAccessor.requestProduction();
} else if (bufAccessor.getState() != EXECBUF_UNDERFLOW) {
// data or EOS already available
return bufAccessor;
}
// please sir, I'd like some more
ParallelExecResult result(current, EXECRC_BUF_UNDERFLOW);
StrictMutexGuard mutexGuard(mutex);
streamStateMap[current].state = SS_SLEEPING;
completedQueue.push_back(result);
condition.notify_one();
while ((streamStateMap[current].state == SS_SLEEPING) && !pPendingExcn) {
sentinelCondition.wait(mutexGuard);
}
if (pPendingExcn) {
pPendingExcn->throwSelf();
}
return bufAccessor;
}
SharedLogicalTxn LogicalTxnLog::newLogicalTxn(
SharedCacheAccessor pCacheAccessor)
{
StrictMutexGuard mutexGuard(mutex);
// Set up cache accessor so that all page locks will be taken out
// with the new TxnId. Just for sanity-checking, set up a quota to make
// sure logging never locks more than two pages at a time.
pCacheAccessor = SharedCacheAccessor(
new QuotaCacheAccessor(
SharedQuotaCacheAccessor(),
pCacheAccessor,
2));
pCacheAccessor->setTxnId(nextTxnId);
SharedLogicalTxn pTxn(
new LogicalTxn(nextTxnId, shared_from_this(), pCacheAccessor));
uncommittedTxns.push_back(pTxn);
++nextTxnId;
return pTxn;
}
