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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 <algorithm>
#include <list>
#include <string>
#include <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/util/future.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/uuid.h"
namespace mongo {
/**
* Tracks the cross replica set progress of a particular index build identified by a build UUID.
*
* This is intended to only be used by the IndexBuildsCoordinator class.
*
* TODO: pass in commit quorum setting and FCV to decide the twoPhaseIndexBuild setting.
*/
struct ReplIndexBuildState {
ReplIndexBuildState(const UUID& indexBuildUUID,
const UUID& collUUID,
const std::vector<std::string> names,
const std::vector<BSONObj>& specs)
: buildUUID(indexBuildUUID),
collectionUUID(collUUID),
indexNames(names),
indexSpecs(specs) {
// Verify that the given index names and index specs match.
invariant(names.size() == specs.size());
for (auto& spec : specs) {
std::string name = spec.getStringField(IndexDescriptor::kIndexNameFieldName);
invariant(std::find(names.begin(), names.end(), name) != names.end());
}
}
// Uniquely identifies this index build across replica set members.
const UUID buildUUID;
// Identifies the collection for which the index is being built. Collections can be renamed, so
// the collection UUID is used to maintain correct association.
const UUID collectionUUID;
// The names of the indexes being built.
const std::vector<std::string> indexNames;
// The specs of the index(es) being built. Facilitates new callers joining an active index
// build.
const std::vector<BSONObj> indexSpecs;
// Whether to do a two phase index build or a single phase index build like in v4.0. The FCV
// at the start of the index build will determine this setting.
bool twoPhaseIndexBuild = false;
// Protects the state below.
mutable stdx::mutex mutex;
// The quorum required of commit ready replica set members before the index build will be
// allowed to commit.
WriteConcernOptions commitQuorum;
// Whether or not the primary replica set member has signaled that it is okay to go ahead and
// verify index constraint violations have gone away.
bool prepareIndexBuild = false;
// Tracks the members of the replica set that have finished building the index(es) and are ready
// to commit the index(es).
std::vector<HostAndPort> commitReadyMembers;
// Communicates the final outcome of the index build to any callers waiting upon the associated
// SharedSemiFuture(s).
using IndexCatalogStats = struct {
int numIndexesBefore = 0;
int numIndexesAfter = 0;
};
SharedPromise<IndexCatalogStats> sharedPromise;
// There is a period of time where the index build is registered on the coordinator, but an
// index builder does not yet exist. Since a signal cannot be set on the index builder at that
// time, it must be saved here.
bool aborted = false;
std::string abortReason = "";
// The coordinator for the index build will wait upon this when awaiting an external signal,
// such as commit or commit readiness signals.
stdx::condition_variable condVar;
};
} // namespace mongo
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