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// index_catalog.h
/**
* Copyright (C) 2013-2014 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.
*/
#pragma once
#include <vector>
#include "mongo/db/catalog/index_catalog_entry.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/record_id.h"
#include "mongo/platform/unordered_map.h"
namespace mongo {
class Client;
class Collection;
class IndexDescriptor;
class IndexAccessMethod;
/**
* how many: 1 per Collection
* lifecycle: attached to a Collection
*/
class IndexCatalog {
public:
IndexCatalog( Collection* collection );
~IndexCatalog();
// must be called before used
Status init(OperationContext* txn);
bool ok() const;
// ---- accessors -----
bool haveAnyIndexes() const;
int numIndexesTotal( OperationContext* txn ) const;
int numIndexesReady( OperationContext* txn ) const;
int numIndexesInProgress( OperationContext* txn ) const {
return numIndexesTotal(txn) - numIndexesReady(txn);
}
/**
* this is in "alive" until the Collection goes away
* in which case everything from this tree has to go away
*/
bool haveIdIndex( OperationContext* txn ) const;
/**
* Returns the spec for the id index to create by default for this collection.
*/
BSONObj getDefaultIdIndexSpec() const;
IndexDescriptor* findIdIndex( OperationContext* txn ) const;
/**
* @return null if cannot find
*/
IndexDescriptor* findIndexByName( OperationContext* txn,
StringData name,
bool includeUnfinishedIndexes = false ) const;
/**
* @return null if cannot find
*/
IndexDescriptor* findIndexByKeyPattern( OperationContext* txn,
const BSONObj& key,
bool includeUnfinishedIndexes = false ) const;
/* Returns the index entry for the first index whose prefix contains
* 'keyPattern'. If 'requireSingleKey' is true, skip indices that contain
* array attributes. Otherwise, returns NULL.
*/
IndexDescriptor* findIndexByPrefix( OperationContext* txn,
const BSONObj &keyPattern,
bool requireSingleKey ) const;
void findIndexByType( OperationContext* txn,
const std::string& type,
std::vector<IndexDescriptor*>& matches,
bool includeUnfinishedIndexes = false ) const;
/**
* Reload the index definition for 'oldDesc' from the CollectionCatalogEntry. 'oldDesc'
* must be a ready index that is already registered with the index catalog. Returns an
* unowned pointer to the descriptor for the new index definition.
*
* Use this method to notify the IndexCatalog that the spec for this index has changed.
*
* It is invalid to dereference 'oldDesc' after calling this method. This method broadcasts
* an invalidateAll() on the cursor manager to notify other users of the IndexCatalog that
* this descriptor is now invalid.
*/
const IndexDescriptor* refreshEntry( OperationContext* txn,
const IndexDescriptor* oldDesc );
// never returns NULL
const IndexCatalogEntry* getEntry( const IndexDescriptor* desc ) const;
IndexAccessMethod* getIndex( const IndexDescriptor* desc );
const IndexAccessMethod* getIndex( const IndexDescriptor* desc ) const;
/**
* Returns a not-ok Status if there are any unfinished index builds. No new indexes should
* be built when in this state.
*/
Status checkUnfinished() const;
class IndexIterator {
public:
bool more();
IndexDescriptor* next();
// returns the access method for the last return IndexDescriptor
IndexAccessMethod* accessMethod( IndexDescriptor* desc );
private:
IndexIterator( OperationContext* txn,
const IndexCatalog* cat,
bool includeUnfinishedIndexes );
void _advance();
bool _includeUnfinishedIndexes;
OperationContext* _txn;
const IndexCatalog* _catalog;
IndexCatalogEntryContainer::const_iterator _iterator;
bool _start; // only true before we've called next() or more()
IndexCatalogEntry* _prev;
IndexCatalogEntry* _next;
friend class IndexCatalog;
};
IndexIterator getIndexIterator( OperationContext* txn,
bool includeUnfinishedIndexes ) const {
return IndexIterator( txn, this, includeUnfinishedIndexes );
};
// ---- index set modifiers ------
/**
* Call this only on an empty collection from inside a WriteUnitOfWork. Index creation on an
* empty collection can be rolled back as part of a larger WUOW.
*/
Status createIndexOnEmptyCollection(OperationContext* txn, BSONObj spec);
StatusWith<BSONObj> prepareSpecForCreate( OperationContext* txn,
const BSONObj& original ) const;
Status dropAllIndexes(OperationContext* txn,
bool includingIdIndex );
Status dropIndex(OperationContext* txn,
IndexDescriptor* desc );
/**
* will drop all incompleted indexes and return specs
* after this, the indexes can be rebuilt
*/
std::vector<BSONObj> getAndClearUnfinishedIndexes(OperationContext* txn);
struct IndexKillCriteria {
std::string ns;
std::string name;
BSONObj key;
};
/**
* Registers an index build in an internal tracking map, for use with
* killMatchingIndexBuilds(). The opNum and descriptor provided must remain active
* for as long as the entry exists in the map. The opNum provided must correspond to
* an operation building only one index, in the background.
* This function is intended for replication to use for tracking and managing background
* index builds. It is expected that the caller has already taken steps to serialize
* calls to this function.
*/
void registerIndexBuild(IndexDescriptor* descriptor, unsigned int opNum);
/**
* Removes an index build from the map, upon completion or termination of the index build.
* This function is intended for replication to use for tracking and managing background
* index builds. It is expected that the caller has already taken steps to serialize
* calls to this function.
*/
void unregisterIndexBuild(IndexDescriptor* descriptor);
/**
* Given some criteria, searches through all in-progress index builds
* and kills ones that match. (namespace, index name, and/or index key spec)
* Returns the list of index specs that were killed, for use in restarting them later.
*/
std::vector<BSONObj> killMatchingIndexBuilds(const IndexKillCriteria& criteria);
// ---- modify single index
bool isMultikey( OperationContext* txn, const IndexDescriptor* idex );
// --- these probably become private?
/**
* disk creation order
* 1) system.indexes entry
* 2) collection's NamespaceDetails
* a) info + head
* b) _indexBuildsInProgress++
* 3) indexes entry in .ns file
* 4) system.namespaces entry for index ns
*/
class IndexBuildBlock {
MONGO_DISALLOW_COPYING(IndexBuildBlock);
public:
IndexBuildBlock(OperationContext* txn,
Collection* collection,
const BSONObj& spec );
~IndexBuildBlock();
Status init();
void success();
/**
* index build failed, clean up meta data
*/
void fail();
IndexCatalogEntry* getEntry() { return _entry; }
private:
Collection* _collection;
IndexCatalog* _catalog;
std::string _ns;
BSONObj _spec;
std::string _indexName;
std::string _indexNamespace;
IndexCatalogEntry* _entry;
bool _inProgress;
OperationContext* _txn;
};
// ----- data modifiers ------
// this throws for now
Status indexRecord(OperationContext* txn, const BSONObj& obj, const RecordId &loc);
void unindexRecord(OperationContext* txn,
const BSONObj& obj,
const RecordId& loc,
bool noWarn);
// ------- temp internal -------
std::string getAccessMethodName(OperationContext* txn, const BSONObj& keyPattern) {
return _getAccessMethodName( txn, keyPattern );
}
Status _upgradeDatabaseMinorVersionIfNeeded( OperationContext* txn,
const std::string& newPluginName );
// public static helpers
static BSONObj fixIndexKey( const BSONObj& key );
private:
typedef unordered_map<IndexDescriptor*, unsigned int> InProgressIndexesMap;
static const BSONObj _idObj; // { _id : 1 }
bool _shouldOverridePlugin( OperationContext* txn, const BSONObj& keyPattern ) const;
/**
* This differs from IndexNames::findPluginName in that returns the plugin name we *should*
* use, not the plugin name inside of the provided key pattern. To understand when these
* differ, see shouldOverridePlugin.
*/
std::string _getAccessMethodName(OperationContext* txn, const BSONObj& keyPattern) const;
void _checkMagic() const;
Status _indexRecord(OperationContext* txn,
IndexCatalogEntry* index,
const BSONObj& obj,
const RecordId &loc );
Status _unindexRecord(OperationContext* txn,
IndexCatalogEntry* index,
const BSONObj& obj,
const RecordId &loc,
bool logIfError);
/**
* this does no sanity checks
*/
Status _dropIndex(OperationContext* txn,
IndexCatalogEntry* entry );
// just does disk hanges
// doesn't change memory state, etc...
void _deleteIndexFromDisk( OperationContext* txn,
const std::string& indexName,
const std::string& indexNamespace );
// descriptor ownership passes to _setupInMemoryStructures
// initFromDisk: Avoids registering a change to undo this operation when set to true.
// You must set this flag if calling this function outside of a UnitOfWork.
IndexCatalogEntry* _setupInMemoryStructures(OperationContext* txn,
IndexDescriptor* descriptor,
bool initFromDisk);
// Apply a set of transformations to the user-provided index object 'spec' to make it
// conform to the standard for insertion. This function adds the 'v' field if it didn't
// exist, removes the '_id' field if it exists, applies plugin-level transformations if
// appropriate, etc.
static BSONObj _fixIndexSpec( const BSONObj& spec );
Status _isSpecOk( const BSONObj& spec ) const;
Status _doesSpecConflictWithExisting( OperationContext* txn, const BSONObj& spec ) const;
int _magic;
Collection* _collection;
IndexCatalogEntryContainer _entries;
// These are the index specs of indexes that were "leftover".
// "Leftover" means they were unfinished when a mongod shut down.
// Certain operations are prohibited until someone fixes.
// Retrieve by calling getAndClearUnfinishedIndexes().
std::vector<BSONObj> _unfinishedIndexes;
// Track in-progress index builds, in order to find and stop them when necessary.
InProgressIndexesMap _inProgressIndexes;
};
}
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