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/**
* Copyright (C) 2022-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.
*/
#include "mongo/db/service_context.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTest
#include "mongo/platform/basic.h"
#include "mongo/db/keys_collection_client_sharded.h"
#include "mongo/db/keys_collection_manager.h"
#include "mongo/db/logical_time_validator.h"
#include "mongo/db/s/config/config_server_test_fixture.h"
#include "mongo/db/s/topology_time_ticker.h"
#include "mongo/db/vector_clock_mutable.h"
#include "mongo/unittest/death_test.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/clock_source_mock.h"
namespace mongo {
namespace {
struct TickPoint {
Timestamp topologyTime;
Timestamp commitTime;
};
class TopologyTimeTickerConfigServer : public ConfigServerTestFixture {
protected:
TopologyTimeTickerConfigServer() : ConfigServerTestFixture(Options{}.useMockClock(true)) {}
void setUp() override {
ConfigServerTestFixture::setUp();
}
void tearDown() override {
ConfigServerTestFixture::tearDown();
}
/**
* This function registers three tick points into the TopologyTimeTicker. Those three tick
* points are also stored in the _ticks vector.
*/
void registerThreeTickPoints(ServiceContext* sc) {
auto& topologyTimeTicker = TopologyTimeTicker::get(sc);
for (int i = 0; i < 3; ++i) {
TickPoint newTick = {Timestamp(1, 2 * i), Timestamp(1, 2 * i + 1)};
_ticks.push_back(newTick);
topologyTimeTicker.onNewLocallyCommittedTopologyTimeAvailable(newTick.commitTime,
newTick.topologyTime);
}
}
void checkTopologyTimeAfterAdvancingMajorityCommitPoint(ServiceContext* sc,
const Timestamp& majorityTime,
const Timestamp& expectedTopologyTime) {
auto& topologyTimeTicker = TopologyTimeTicker::get(sc);
auto vc = VectorClockMutable::get(sc);
topologyTimeTicker.onMajorityCommitPointUpdate(sc, repl::OpTime(majorityTime, /*term*/ -1));
const auto time = vc->getTime();
ASSERT_EQ(LogicalTime(expectedTopologyTime), time.topologyTime());
}
static const Timestamp kCommitTimePreTicks;
static const Timestamp kCommitTimePostTicks;
// The commit time of the different ticks must belong to the range (kCommitTimePreTicks,
// kCommitTimePostTicks)
std::vector<TickPoint> _ticks;
};
const Timestamp TopologyTimeTickerConfigServer::kCommitTimePreTicks = Timestamp(0, 1);
const Timestamp TopologyTimeTickerConfigServer::kCommitTimePostTicks = Timestamp(10, 10);
TEST_F(TopologyTimeTickerConfigServer, GossipingNewTopologyTimesWhenMajorityCommitted1) {
auto sc = getServiceContext();
registerThreeTickPoints(sc);
// Checking initial topologyTime value
checkTopologyTimeAfterAdvancingMajorityCommitPoint(sc, kCommitTimePreTicks, Timestamp(0, 1));
// Checking that after advancing the commit point we also advance the topologyTime
for (const auto& tick : _ticks) {
checkTopologyTimeAfterAdvancingMajorityCommitPoint(sc, tick.commitTime, tick.topologyTime);
}
// The majority commit point is advanced a bit more but there are no tick points: the
// topology time shouldn't change.
checkTopologyTimeAfterAdvancingMajorityCommitPoint(
sc, kCommitTimePostTicks, _ticks.back().topologyTime);
}
TEST_F(TopologyTimeTickerConfigServer, GossipingNewTopologyTimesWhenMajorityCommitted2) {
auto sc = getServiceContext();
registerThreeTickPoints(sc);
// Checking initial topologyTime value
checkTopologyTimeAfterAdvancingMajorityCommitPoint(sc, kCommitTimePreTicks, Timestamp(0, 1));
// The majority commit point is advanced to a point that includes all the tick points. The
// topology time should be the greatest one.
checkTopologyTimeAfterAdvancingMajorityCommitPoint(
sc, kCommitTimePostTicks, _ticks.back().topologyTime);
}
DEATH_TEST_F(TopologyTimeTickerConfigServer,
InvalidonNewLocallyCommittedTopologyTimeAvailable,
"invariant") {
// This test verifies that the internal elements on the tick point vector are sorted.
auto sc = getServiceContext();
Timestamp topologyTime1(0, 8);
Timestamp commitTime1(0, 10);
auto& topologyTimeTicker = TopologyTimeTicker::get(sc);
topologyTimeTicker.onNewLocallyCommittedTopologyTimeAvailable(commitTime1, topologyTime1);
Timestamp topologyTime2(0, 5);
Timestamp commitTime2(0, 6);
// Newer tick points must have a greater commit time than older ones
topologyTimeTicker.onNewLocallyCommittedTopologyTimeAvailable(commitTime2, topologyTime2);
}
TEST_F(TopologyTimeTickerConfigServer, RollbackingAllTickPoints) {
auto sc = getServiceContext();
registerThreeTickPoints(sc);
// Checking initial topologyTime value
checkTopologyTimeAfterAdvancingMajorityCommitPoint(sc, kCommitTimePreTicks, Timestamp(0, 1));
// We rollback all tick points
auto& topologyTimeTicker = TopologyTimeTicker::get(sc);
topologyTimeTicker.onReplicationRollback(repl::OpTime(kCommitTimePreTicks, /*term*/ -1));
// The majority commit point is advanced to a point that would have included all our tick
// points, but because they were rollbacked the topology time should still be Timestamp(0, 1).
checkTopologyTimeAfterAdvancingMajorityCommitPoint(sc, kCommitTimePostTicks, Timestamp(0, 1));
}
TEST_F(TopologyTimeTickerConfigServer, PartialRollbackingTickPoints) {
auto sc = getServiceContext();
registerThreeTickPoints(sc);
// We rollback the last two tick points
auto& topologyTimeTicker = TopologyTimeTicker::get(sc);
topologyTimeTicker.onReplicationRollback(repl::OpTime(_ticks.front().commitTime, /*term*/ -1));
// The majority commit point is advanced to a point that includes all the tick points. The
// topology time should be the one from the first tick since the other two were rollbacked.
checkTopologyTimeAfterAdvancingMajorityCommitPoint(
sc, kCommitTimePostTicks, _ticks.front().topologyTime);
}
} // namespace
} // namespace mongo
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