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/**
* 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/>.
*/
/**
* This file tests db/exec/oplogstart.{h,cpp}. OplogStart is an execution stage
* responsible for walking the oplog backwards in order to find where the oplog should
* be replayed from for replication.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/index_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/db.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/exec/oplogstart.h"
#include "mongo/db/exec/working_set.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/repl_settings.h"
#include "mongo/db/service_context.h"
#include "mongo/dbtests/dbtests.h"
namespace OplogStartTests {
using std::unique_ptr;
using std::string;
static const NamespaceString nss("unittests.oplogstarttests");
class Base {
public:
Base() : _lk(&_opCtx), _context(&_opCtx, nss.ns()), _client(&_opCtx) {
Collection* c = _context.db()->getCollection(&_opCtx, nss);
if (!c) {
WriteUnitOfWork wuow(&_opCtx);
c = _context.db()->createCollection(&_opCtx, nss.ns());
wuow.commit();
}
ASSERT(c->getIndexCatalog()->haveIdIndex(&_opCtx));
}
~Base() {
client()->dropCollection(nss.ns());
// The OplogStart stage is not allowed to outlive it's RecoveryUnit.
_stage.reset();
}
protected:
Collection* collection() {
return _context.db()->getCollection(&_opCtx, nss);
}
DBDirectClient* client() {
return &_client;
}
void setupFromQuery(const BSONObj& query) {
auto qr = stdx::make_unique<QueryRequest>(nss);
qr->setFilter(query);
auto statusWithCQ = CanonicalQuery::canonicalize(&_opCtx, std::move(qr));
ASSERT_OK(statusWithCQ.getStatus());
_cq = std::move(statusWithCQ.getValue());
_oplogws.reset(new WorkingSet());
const auto timestamp = query[repl::OpTime::kTimestampFieldName]
.embeddedObjectUserCheck()
.firstElement()
.timestamp();
_stage = stdx::make_unique<OplogStart>(&_opCtx, collection(), timestamp, _oplogws.get());
}
void assertWorkingSetMemberHasId(WorkingSetID id, int expectedId) {
WorkingSetMember* member = _oplogws->get(id);
BSONElement idEl = member->obj.value()["_id"];
ASSERT(!idEl.eoo());
ASSERT(idEl.isNumber());
ASSERT_EQUALS(idEl.numberInt(), expectedId);
}
unique_ptr<CanonicalQuery> _cq;
unique_ptr<WorkingSet> _oplogws;
unique_ptr<OplogStart> _stage;
private:
// The order of these is important in order to ensure order of destruction
const ServiceContext::UniqueOperationContext _opCtxPtr = cc().makeOperationContext();
OperationContext& _opCtx = *_opCtxPtr;
Lock::GlobalWrite _lk;
OldClientContext _context;
DBDirectClient _client;
};
/**
* When the ts is newer than the oldest document, the OplogStart
* stage should find the oldest document using a backwards collection
* scan.
*/
class OplogStartIsOldest : public Base {
public:
void run() {
for (int i = 0; i < 10; ++i) {
client()->insert(nss.ns(), BSON("_id" << i << "ts" << Timestamp(1000, i)));
}
setupFromQuery(BSON("ts" << BSON("$gte" << Timestamp(1000, 10))));
WorkingSetID id = WorkingSet::INVALID_ID;
// collection scan needs to be initialized
ASSERT_EQUALS(_stage->work(&id), PlanStage::NEED_TIME);
// finds starting record
ASSERT_EQUALS(_stage->work(&id), PlanStage::ADVANCED);
ASSERT(_stage->isBackwardsScanning());
assertWorkingSetMemberHasId(id, 9);
}
};
/**
* Find the starting oplog record by scanning backwards
* all the way to the beginning.
*/
class OplogStartIsNewest : public Base {
public:
void run() {
for (int i = 0; i < 10; ++i) {
client()->insert(nss.ns(), BSON("_id" << i << "ts" << Timestamp(1000, i)));
}
setupFromQuery(BSON("ts" << BSON("$gte" << Timestamp(1000, 0))));
WorkingSetID id = WorkingSet::INVALID_ID;
// collection scan needs to be initialized
ASSERT_EQUALS(_stage->work(&id), PlanStage::NEED_TIME);
// full collection scan back to the first oplog record
for (int i = 0; i < 9; ++i) {
ASSERT_EQUALS(_stage->work(&id), PlanStage::NEED_TIME);
ASSERT(_stage->isBackwardsScanning());
}
ASSERT_EQUALS(_stage->work(&id), PlanStage::ADVANCED);
assertWorkingSetMemberHasId(id, 0);
}
};
class All : public Suite {
public:
All() : Suite("oplogstart") {}
void setupTests() {
// Replication is not supported by mobile SE.
if (mongo::storageGlobalParams.engine == "mobile") {
return;
}
add<OplogStartIsOldest>();
add<OplogStartIsNewest>();
}
};
SuiteInstance<All> oplogStart;
} // namespace OplogStartTests
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