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// collection_compact.cpp
/**
* Copyright (C) 2013 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/catalog/collection.h"
#include "mongo/base/counter.h"
#include "mongo/base/owned_pointer_map.h"
#include "mongo/db/catalog/index_create.h"
#include "mongo/db/clientcursor.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/curop.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/index_key_validate.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/structure/catalog/namespace_details.h"
#include "mongo/db/storage/extent.h"
#include "mongo/db/storage/extent_manager.h"
#include "mongo/db/storage/record.h"
#include "mongo/db/storage/transaction.h"
#include "mongo/util/touch_pages.h"
namespace mongo {
namespace {
BSONObj _compactAdjustIndexSpec( const BSONObj& oldSpec ) {
BSONObjBuilder b;
BSONObj::iterator i( oldSpec );
while( i.more() ) {
BSONElement e = i.next();
if ( str::equals( e.fieldName(), "v" ) ) {
// Drop any preexisting index version spec. The default index version will
// be used instead for the new index.
continue;
}
if ( str::equals( e.fieldName(), "background" ) ) {
// Create the new index in the foreground.
continue;
}
// Pass the element through to the new index spec.
b.append(e);
}
return b.obj();
}
class MyCompactAdaptor : public RecordStoreCompactAdaptor {
public:
MyCompactAdaptor(Collection* collection,
MultiIndexBlock* indexBlock)
: _collection( collection ),
_multiIndexBlock(indexBlock) {
}
virtual bool isDataValid( Record* rec ) {
return BSONObj( rec->data() ).valid();
}
virtual size_t dataSize( Record* rec ) {
return BSONObj( rec->data() ).objsize();
}
virtual void inserted( Record* rec, const DiskLoc& newLocation ) {
InsertDeleteOptions options;
options.logIfError = false;
options.dupsAllowed = true; // in compact we should be doing no checking
_multiIndexBlock->insert( BSONObj( rec->data() ), newLocation, options );
}
private:
Collection* _collection;
MultiIndexBlock* _multiIndexBlock;
};
}
StatusWith<CompactStats> Collection::compact( TransactionExperiment* txn,
const CompactOptions* compactOptions ) {
if ( !_recordStore->compactSupported() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
str::stream() <<
"cannot compact collection with record store: " <<
_recordStore->name() );
if ( _indexCatalog.numIndexesInProgress() )
return StatusWith<CompactStats>( ErrorCodes::BadValue,
"cannot compact when indexes in progress" );
// 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 compact collection due to invalid index "
<< spec << ": " << keyStatus.reason() << " For more info see"
<< " http://dochub.mongodb.org/core/index-validation");
}
indexSpecs.push_back(spec);
}
}
// 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(txn, true);
if ( !status.isOK() ) {
return StatusWith<CompactStats>( status );
}
killCurrentOp.checkForInterrupt();
CompactStats stats;
MultiIndexBlock multiIndexBlock(txn, this);
status = multiIndexBlock.init( indexSpecs );
if ( !status.isOK() )
return StatusWith<CompactStats>( status );
MyCompactAdaptor adaptor(this, &multiIndexBlock);
_recordStore->compact( txn, &adaptor, compactOptions, &stats );
log() << "starting index commits";
status = multiIndexBlock.commit();
if ( !status.isOK() )
return StatusWith<CompactStats>( status );
return StatusWith<CompactStats>( stats );
}
} // namespace mongo
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