Database::Database(TransactionExperiment* txn, const char *nm, bool& newDb, const string& path )
: _name(nm), _path(path),
_namespaceIndex( _path, _name ),
_extentManager(new MmapV1ExtentManager(_name, _path, storageGlobalParams.directoryperdb)),
_profileName(_name + ".system.profile"),
_namespacesName(_name + ".system.namespaces"),
_indexesName(_name + ".system.indexes"),
_collectionLock( "Database::_collectionLock" )
{
Status status = validateDBName( _name );
if ( !status.isOK() ) {
warning() << "tried to open invalid db: " << _name << endl;
uasserted( 10028, status.toString() );
}
try {
newDb = _namespaceIndex.exists();
_profile = serverGlobalParams.defaultProfile;
checkDuplicateUncasedNames(true);
// If already exists, open. Otherwise behave as if empty until
// there's a write, then open.
if (!newDb) {
_namespaceIndex.init( txn );
openAllFiles(txn);
// upgrade freelist
string oldFreeList = _name + ".$freelist";
NamespaceDetails* details = _namespaceIndex.details( oldFreeList );
if ( details ) {
if ( !details->firstExtent().isNull() ) {
_extentManager->freeExtents(txn,
details->firstExtent(),
details->lastExtent());
}
_namespaceIndex.kill_ns( txn, oldFreeList );
}
}
_magic = 781231;
}
catch(std::exception& e) {
log() << "warning database " << path << " " << nm << " could not be opened" << endl;
DBException* dbe = dynamic_cast<DBException*>(&e);
if ( dbe != 0 ) {
log() << "DBException " << dbe->getCode() << ": " << e.what() << endl;
}
else {
log() << e.what() << endl;
}
_extentManager.reset();
throw;
}
}
shared_ptr<Cursor> DataFileMgr::findAll(const StringData& ns, const DiskLoc &startLoc) {
NamespaceDetails * d = nsdetails( ns );
if ( ! d )
return shared_ptr<Cursor>(new BasicCursor(DiskLoc()));
DiskLoc loc = d->firstExtent();
if ( loc.isNull() )
return shared_ptr<Cursor>(new BasicCursor(DiskLoc()));
Extent *e = getExtent(loc);
DEBUGGING {
out() << "listing extents for " << ns << endl;
DiskLoc tmp = loc;
set<DiskLoc> extents;
while ( 1 ) {
Extent *f = getExtent(tmp);
out() << "extent: " << tmp.toString() << endl;
extents.insert(tmp);
tmp = f->xnext;
if ( tmp.isNull() )
break;
f = f->getNextExtent();
}
out() << endl;
d->dumpDeleted(&extents);
}
if ( d->isCapped() )
return shared_ptr<Cursor>( ForwardCappedCursor::make( d , startLoc ) );
if ( !startLoc.isNull() )
return shared_ptr<Cursor>(new BasicCursor( startLoc ));
while ( e->firstRecord.isNull() && !e->xnext.isNull() ) {
/* todo: if extent is empty, free it for reuse elsewhere.
that is a bit complicated have to clean up the freelists.
*/
RARELY out() << "info DFM::findAll(): extent " << loc.toString() << " was empty, skipping ahead. ns:" << ns << endl;
// find a nonempty extent
// it might be nice to free the whole extent here! but have to clean up free recs then.
e = e->getNextExtent();
}
return shared_ptr<Cursor>(new BasicCursor( e->firstRecord ));
}
virtual bool run(const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
string source = cmdObj.getStringField( name.c_str() );
string target = cmdObj.getStringField( "to" );
uassert(15967,
"invalid collection name: " + target,
NamespaceString::validCollectionComponent(target.c_str()));
if ( source.empty() || target.empty() ) {
errmsg = "invalid command syntax";
return false;
}
string sourceDB = nsToDatabase(source);
string targetDB = nsToDatabase(target);
string databaseName = sourceDB;
databaseName += ".system.indexes";
int longestIndexNameLength = 0;
vector<BSONObj> oldIndSpec = Helpers::findAll(databaseName, BSON("ns" << source));
for (size_t i = 0; i < oldIndSpec.size(); ++i) {
int thisLength = oldIndSpec[i].getField("name").valuesize();
if (thisLength > longestIndexNameLength) {
longestIndexNameLength = thisLength;
}
}
unsigned int longestAllowed = maxNamespaceLen - longestIndexNameLength - 1;
if (target.size() > longestAllowed) {
StringBuilder sb;
sb << "collection name length of " << target.size()
<< " exceeds maximum length of " << longestAllowed
<< ", allowing for index names";
uasserted(16451, sb.str());
}
bool capped = false;
long long size = 0;
std::vector<BSONObj> indexesInProg;
{
Client::Context ctx( source );
NamespaceDetails *nsd = nsdetails( source );
uassert( 10026 , "source namespace does not exist", nsd );
indexesInProg = stopIndexBuilds(dbname, cmdObj);
capped = nsd->isCapped();
if ( capped )
for( DiskLoc i = nsd->firstExtent(); !i.isNull(); i = i.ext()->xnext )
size += i.ext()->length;
}
Client::Context ctx( target );
if ( nsdetails( target ) ) {
uassert( 10027 , "target namespace exists", cmdObj["dropTarget"].trueValue() );
Status s = cc().database()->dropCollection( target );
if ( !s.isOK() ) {
errmsg = s.toString();
return false;
}
}
// if we are renaming in the same database, just
// rename the namespace and we're done.
{
if ( sourceDB == targetDB ) {
Status s = ctx.db()->renameCollection( source, target, cmdObj["stayTemp"].trueValue() );
if ( !s.isOK() ) {
errmsg = s.toString();
return false;
}
return true;
}
}
// renaming across databases, so we must copy all
// the data and then remove the source collection.
BSONObjBuilder spec;
if ( capped ) {
spec.appendBool( "capped", true );
spec.append( "size", double( size ) );
}
if ( !userCreateNS( target.c_str(), spec.done(), errmsg, false ) )
return false;
auto_ptr< DBClientCursor > c;
DBDirectClient bridge;
{
c = bridge.query( source, BSONObj(), 0, 0, 0, fromRepl ? QueryOption_SlaveOk : 0 );
}
while( 1 ) {
{
if ( !c->more() )
break;
}
BSONObj o = c->next();
theDataFileMgr.insertWithObjMod( target.c_str(), o );
}
string sourceIndexes = nsToDatabase( source ) + ".system.indexes";
string targetIndexes = nsToDatabase( target ) + ".system.indexes";
{
c = bridge.query( sourceIndexes, QUERY( "ns" << source ), 0, 0, 0, fromRepl ? QueryOption_SlaveOk : 0 );
}
while( 1 ) {
{
if ( !c->more() )
break;
}
BSONObj o = c->next();
BSONObjBuilder b;
BSONObjIterator i( o );
while( i.moreWithEOO() ) {
BSONElement e = i.next();
if ( e.eoo() )
break;
if ( strcmp( e.fieldName(), "ns" ) == 0 ) {
b.append( "ns", target );
}
else {
b.append( e );
}
}
BSONObj n = b.done();
theDataFileMgr.insertWithObjMod( targetIndexes.c_str(), n );
}
{
Client::Context ctx( source );
Status s = ctx.db()->dropCollection( source );
if ( !s.isOK() ) {
errmsg = s.toString();
return false;
}
IndexBuilder::restoreIndexes(targetIndexes, indexesInProg);
}
return true;
}
StatusWith<CompactStats> Collection::compact( const CompactOptions* compactOptions ) {
if ( isCapped() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
"cannot compact capped collection" );
if ( _indexCatalog.numIndexesInProgress() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
"cannot compact when indexes in progress" );
NamespaceDetails* d = details();
// this is a big job, so might as well make things tidy before we start just to be nice.
getDur().commitIfNeeded();
list<DiskLoc> extents;
for( DiskLoc L = d->firstExtent(); !L.isNull(); L = L.ext()->xnext )
extents.push_back(L);
log() << "compact " << extents.size() << " extents" << endl;
// same data, but might perform a little different after compact?
_infoCache.reset();
vector<BSONObj> indexSpecs;
{
IndexCatalog::IndexIterator ii( _indexCatalog.getIndexIterator( false ) );
while ( ii.more() ) {
IndexDescriptor* descriptor = ii.next();
const BSONObj spec = _compactAdjustIndexSpec(descriptor->infoObj());
const BSONObj key = spec.getObjectField("key");
const Status keyStatus = validateKeyPattern(key);
if (!keyStatus.isOK()) {
return StatusWith<CompactStats>(
ErrorCodes::CannotCreateIndex,
str::stream() << "Cannot rebuild index " << spec << ": "
<< keyStatus.reason()
<< " For more info see"
<< " http://dochub.mongodb.org/core/index-validation");
}
indexSpecs.push_back(spec);
}
}
log() << "compact orphan deleted lists" << endl;
d->orphanDeletedList();
// Start over from scratch with our extent sizing and growth
d->setLastExtentSize( 0 );
// before dropping indexes, at least make sure we can allocate one extent!
// this will allocate an extent and add to free list
// if it cannot, it will throw an exception
increaseStorageSize( _details->lastExtentSize(), true );
// note that the drop indexes call also invalidates all clientcursors for the namespace,
// which is important and wanted here
log() << "compact dropping indexes" << endl;
Status status = _indexCatalog.dropAllIndexes( true );
if ( !status.isOK() ) {
return StatusWith<CompactStats>( status );
}
getDur().commitIfNeeded();
killCurrentOp.checkForInterrupt();
CompactStats stats;
MultiIndexBlock multiIndexBlock( this );
status = multiIndexBlock.init( indexSpecs );
if ( !status.isOK() )
return StatusWith<CompactStats>( status );
// reset data size and record counts to 0 for this namespace
// as we're about to tally them up again for each new extent
d->setStats( 0, 0 );
ProgressMeterHolder pm(cc().curop()->setMessage("compact extent",
"Extent Compacting Progress",
extents.size()));
int extentNumber = 0;
for( list<DiskLoc>::iterator i = extents.begin(); i != extents.end(); i++ ) {
_compactExtent(*i, extentNumber++, multiIndexBlock, compactOptions, &stats );
pm.hit();
}
verify( d->firstExtent().ext()->xprev.isNull() );
// indexes will do their own progress meter?
pm.finished();
log() << "starting index commits";
status = multiIndexBlock.commit();
if ( !status.isOK() )
return StatusWith<CompactStats>( status );
return StatusWith<CompactStats>( stats );
}
void validateNS(const string& ns,
Collection* collection,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
const bool full = cmdObj["full"].trueValue();
const bool scanData = full || cmdObj["scandata"].trueValue();
NamespaceDetails* nsd = collection->details();
bool valid = true;
BSONArrayBuilder errors; // explanation(s) for why valid = false
if ( collection->isCapped() ){
result.append("capped", nsd->isCapped());
result.appendNumber("max", nsd->maxCappedDocs());
}
if ( nsd->firstExtent().isNull() )
result.append( "firstExtent", "null" );
else
result.append( "firstExtent", str::stream() << nsd->firstExtent().toString()
<< " ns:" << nsd->firstExtent().ext()->nsDiagnostic.toString());
if ( nsd->lastExtent().isNull() )
result.append( "lastExtent", "null" );
else
result.append( "lastExtent", str::stream() << nsd->lastExtent().toString()
<< " ns:" << nsd->lastExtent().ext()->nsDiagnostic.toString());
BSONArrayBuilder extentData;
int extentCount = 0;
try {
if ( !nsd->firstExtent().isNull() ) {
nsd->firstExtent().ext()->assertOk();
nsd->lastExtent().ext()->assertOk();
}
DiskLoc extentDiskLoc = nsd->firstExtent();
while (!extentDiskLoc.isNull()) {
Extent* thisExtent = extentDiskLoc.ext();
if (full) {
extentData << thisExtent->dump();
}
if (!thisExtent->validates(extentDiskLoc, &errors)) {
valid = false;
}
DiskLoc nextDiskLoc = thisExtent->xnext;
if (extentCount > 0 && !nextDiskLoc.isNull()
&& nextDiskLoc.ext()->xprev != extentDiskLoc) {
StringBuilder sb;
sb << "'xprev' pointer " << nextDiskLoc.ext()->xprev.toString()
<< " in extent " << nextDiskLoc.toString()
<< " does not point to extent " << extentDiskLoc.toString();
errors << sb.str();
valid = false;
}
if (nextDiskLoc.isNull() && extentDiskLoc != nsd->lastExtent()) {
StringBuilder sb;
sb << "'lastExtent' pointer " << nsd->lastExtent().toString()
<< " does not point to last extent in list " << extentDiskLoc.toString();
errors << sb.str();
valid = false;
}
extentDiskLoc = nextDiskLoc;
extentCount++;
killCurrentOp.checkForInterrupt();
}
}
catch (const DBException& e) {
StringBuilder sb;
sb << "exception validating extent " << extentCount
<< ": " << e.what();
errors << sb.str();
valid = false;
}
result.append("extentCount", extentCount);
if ( full )
result.appendArray( "extents" , extentData.arr() );
result.appendNumber("datasize", nsd->dataSize());
result.appendNumber("nrecords", nsd->numRecords());
result.appendNumber("lastExtentSize", nsd->lastExtentSize());
result.appendNumber("padding", nsd->paddingFactor());
try {
bool testingLastExtent = false;
try {
if (nsd->firstExtent().isNull()) {
// this is ok
}
else {
result.append("firstExtentDetails", nsd->firstExtent().ext()->dump());
if (!nsd->firstExtent().ext()->xprev.isNull()) {
StringBuilder sb;
sb << "'xprev' pointer in 'firstExtent' " << nsd->firstExtent().toString()
<< " is " << nsd->firstExtent().ext()->xprev.toString()
<< ", should be null";
errors << sb.str();
valid=false;
}
}
testingLastExtent = true;
if (nsd->lastExtent().isNull()) {
// this is ok
}
else {
if (nsd->firstExtent() != nsd->lastExtent()) {
result.append("lastExtentDetails", nsd->lastExtent().ext()->dump());
if (!nsd->lastExtent().ext()->xnext.isNull()) {
StringBuilder sb;
sb << "'xnext' pointer in 'lastExtent' " << nsd->lastExtent().toString()
<< " is " << nsd->lastExtent().ext()->xnext.toString()
<< ", should be null";
errors << sb.str();
valid = false;
}
}
}
}
catch (const DBException& e) {
StringBuilder sb;
sb << "exception processing '"
<< (testingLastExtent ? "lastExtent" : "firstExtent")
<< "': " << e.what();
errors << sb.str();
valid = false;
}
set<DiskLoc> recs;
if( scanData ) {
int n = 0;
int nInvalid = 0;
long long nQuantizedSize = 0;
long long nPowerOf2QuantizedSize = 0;
long long len = 0;
long long nlen = 0;
long long bsonLen = 0;
int outOfOrder = 0;
DiskLoc cl_last;
DiskLoc cl;
Runner::RunnerState state;
auto_ptr<Runner> runner(InternalPlanner::collectionScan(ns));
while (Runner::RUNNER_ADVANCED == (state = runner->getNext(NULL, &cl))) {
n++;
if ( n < 1000000 )
recs.insert(cl);
if ( nsd->isCapped() ) {
if ( cl < cl_last )
outOfOrder++;
cl_last = cl;
}
Record *r = cl.rec();
len += r->lengthWithHeaders();
nlen += r->netLength();
if ( r->lengthWithHeaders() ==
NamespaceDetails::quantizeAllocationSpace
( r->lengthWithHeaders() ) ) {
// Count the number of records having a size consistent with
// the quantizeAllocationSpace quantization implementation.
++nQuantizedSize;
}
if ( r->lengthWithHeaders() ==
NamespaceDetails::quantizePowerOf2AllocationSpace
( r->lengthWithHeaders() - 1 ) ) {
// Count the number of records having a size consistent with the
// quantizePowerOf2AllocationSpace quantization implementation.
// Because of SERVER-8311, power of 2 quantization is not idempotent and
// r->lengthWithHeaders() - 1 must be checked instead of the record
// length itself.
++nPowerOf2QuantizedSize;
}
if (full){
BSONObj obj = BSONObj::make(r);
if (!obj.isValid() || !obj.valid()){ // both fast and deep checks
valid = false;
if (nInvalid == 0) // only log once;
errors << "invalid bson object detected (see logs for more info)";
nInvalid++;
if (strcmp("_id", obj.firstElementFieldName()) == 0){
try {
obj.firstElement().validate(); // throws on error
log() << "Invalid bson detected in " << ns << " with _id: " << obj.firstElement().toString(false) << endl;
}
catch(...){
log() << "Invalid bson detected in " << ns << " with corrupt _id" << endl;
}
}
else {
log() << "Invalid bson detected in " << ns << " and couldn't find _id" << endl;
}
}
else {
bsonLen += obj.objsize();
}
}
}
if (Runner::RUNNER_EOF != state) {
// TODO: more descriptive logging.
warning() << "Internal error while reading collection " << ns << endl;
}
if ( nsd->isCapped() && !nsd->capLooped() ) {
result.append("cappedOutOfOrder", outOfOrder);
if ( outOfOrder > 1 ) {
valid = false;
errors << "too many out of order records";
}
}
result.append("objectsFound", n);
if (full) {
result.append("invalidObjects", nInvalid);
}
result.appendNumber("nQuantizedSize", nQuantizedSize);
result.appendNumber("nPowerOf2QuantizedSize", nPowerOf2QuantizedSize);
result.appendNumber("bytesWithHeaders", len);
result.appendNumber("bytesWithoutHeaders", nlen);
if (full) {
result.appendNumber("bytesBson", bsonLen);
}
}
BSONArrayBuilder deletedListArray;
for ( int i = 0; i < Buckets; i++ ) {
deletedListArray << nsd->deletedListEntry(i).isNull();
}
int ndel = 0;
long long delSize = 0;
BSONArrayBuilder delBucketSizes;
int incorrect = 0;
for ( int i = 0; i < Buckets; i++ ) {
DiskLoc loc = nsd->deletedListEntry(i);
try {
int k = 0;
while ( !loc.isNull() ) {
if ( recs.count(loc) )
incorrect++;
ndel++;
if ( loc.questionable() ) {
if( nsd->isCapped() && !loc.isValid() && i == 1 ) {
/* the constructor for NamespaceDetails intentionally sets deletedList[1] to invalid
see comments in namespace.h
*/
break;
}
string err( str::stream() << "bad pointer in deleted record list: "
<< loc.toString()
<< " bucket: " << i
<< " k: " << k );
errors << err;
valid = false;
break;
}
DeletedRecord *d = loc.drec();
delSize += d->lengthWithHeaders();
loc = d->nextDeleted();
k++;
killCurrentOp.checkForInterrupt();
}
delBucketSizes << k;
}
catch (...) {
errors << ("exception in deleted chain for bucket " + BSONObjBuilder::numStr(i));
valid = false;
}
}
result.appendNumber("deletedCount", ndel);
result.appendNumber("deletedSize", delSize);
if ( full ) {
result << "delBucketSizes" << delBucketSizes.arr();
}
if ( incorrect ) {
errors << (BSONObjBuilder::numStr(incorrect) + " records from datafile are in deleted list");
valid = false;
}
int idxn = 0;
try {
IndexCatalog* indexCatalog = collection->getIndexCatalog();
result.append("nIndexes", nsd->getCompletedIndexCount());
BSONObjBuilder indexes; // not using subObjStart to be exception safe
NamespaceDetails::IndexIterator i = nsd->ii();
while( i.more() ) {
IndexDetails& id = i.next();
log() << "validating index " << idxn << ": " << id.indexNamespace() << endl;
IndexDescriptor* descriptor = indexCatalog->getDescriptor( idxn );
verify( descriptor );
IndexAccessMethod* iam = indexCatalog->getIndex( descriptor );
verify( iam );
int64_t keys;
iam->validate(&keys);
indexes.appendNumber(id.indexNamespace(), static_cast<long long>(keys));
idxn++;
}
result.append("keysPerIndex", indexes.done());
}
catch (...) {
errors << ("exception during index validate idxn " + BSONObjBuilder::numStr(idxn));
valid=false;
}
}
catch (AssertionException) {
errors << "exception during validate";
valid = false;
}
result.appendBool("valid", valid);
result.append("errors", errors.arr());
if ( !full ){
result.append("warning", "Some checks omitted for speed. use {full:true} option to do more thorough scan.");
}
if ( !valid ) {
result.append("advice", "ns corrupt, requires repair");
}
}
StatusWith<CompactStats> Collection::compact( const CompactOptions* compactOptions ) {
if ( isCapped() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
"cannot compact capped collection" );
if ( _indexCatalog.numIndexesInProgress() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
"cannot compact when indexes in progress" );
NamespaceDetails* d = details();
// this is a big job, so might as well make things tidy before we start just to be nice.
getDur().commitIfNeeded();
list<DiskLoc> extents;
for( DiskLoc L = d->firstExtent(); !L.isNull(); L = L.ext()->xnext )
extents.push_back(L);
log() << "compact " << extents.size() << " extents" << endl;
// same data, but might perform a little different after compact?
_infoCache.reset();
vector<BSONObj> indexSpecs;
{
IndexCatalog::IndexIterator ii( _indexCatalog.getIndexIterator( false ) );
while ( ii.more() ) {
IndexDescriptor* descriptor = ii.next();
indexSpecs.push_back( _compactAdjustIndexSpec( descriptor->infoObj() ) );
}
}
log() << "compact orphan deleted lists" << endl;
d->orphanDeletedList();
// Start over from scratch with our extent sizing and growth
d->setLastExtentSize( 0 );
// before dropping indexes, at least make sure we can allocate one extent!
if ( allocateSpaceForANewRecord( _ns.ns().c_str(),
d,
Record::HeaderSize+1,
false).isNull() ) {
return StatusWith<CompactStats>( ErrorCodes::InternalError,
"compact error no space available to allocate" );
}
// note that the drop indexes call also invalidates all clientcursors for the namespace,
// which is important and wanted here
log() << "compact dropping indexes" << endl;
Status status = _indexCatalog.dropAllIndexes( true );
if ( !status.isOK() ) {
return StatusWith<CompactStats>( status );
}
getDur().commitIfNeeded();
CompactStats stats;
OwnedPointerVector<IndexCatalog::IndexBuildBlock> indexBuildBlocks;
vector<IndexAccessMethod*> indexesToInsertTo;
vector< std::pair<IndexAccessMethod*,IndexAccessMethod*> > bulkToCommit;
for ( size_t i = 0; i < indexSpecs.size(); i++ ) {
killCurrentOp.checkForInterrupt(false);
BSONObj info = indexSpecs[i];
info = _compactAdjustIndexSpec( info );
info = _indexCatalog.fixIndexSpec( info );
auto_ptr<IndexCatalog::IndexBuildBlock> block( new IndexCatalog::IndexBuildBlock( this,info ) );
Status status = block->init();
if ( !status.isOK() )
return StatusWith<CompactStats>(status);
IndexAccessMethod* accessMethod = block->getEntry()->accessMethod();
status = accessMethod->initializeAsEmpty();
if ( !status.isOK() )
return StatusWith<CompactStats>(status);
IndexAccessMethod* bulk = accessMethod->initiateBulk();
if ( bulk ) {
indexesToInsertTo.push_back( bulk );
bulkToCommit.push_back( std::pair<IndexAccessMethod*,IndexAccessMethod*>( accessMethod, bulk ) );
}
else {
indexesToInsertTo.push_back( accessMethod );
}
indexBuildBlocks.mutableVector().push_back( block.release() );
}
// reset data size and record counts to 0 for this namespace
// as we're about to tally them up again for each new extent
d->setStats( 0, 0 );
ProgressMeterHolder pm(cc().curop()->setMessage("compact extent",
"Extent Compacting Progress",
extents.size()));
int extentNumber = 0;
for( list<DiskLoc>::iterator i = extents.begin(); i != extents.end(); i++ ) {
_compactExtent(*i, extentNumber++, indexesToInsertTo, compactOptions, &stats );
pm.hit();
}
verify( d->firstExtent().ext()->xprev.isNull() );
// indexes will do their own progress meter?
pm.finished();
log() << "starting index commits";
for ( size_t i = 0; i < bulkToCommit.size(); i++ ) {
bulkToCommit[i].first->commitBulk( bulkToCommit[i].second, false, NULL );
}
for ( size_t i = 0; i < indexBuildBlocks.size(); i++ ) {
IndexCatalog::IndexBuildBlock* block = indexBuildBlocks.mutableVector()[i];
block->success();
}
return StatusWith<CompactStats>( stats );
}