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/**
* Copyright (C) 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context_noop.h"
#include "mongo/db/repl/is_master_response.h"
#include "mongo/db/repl/operation_context_repl_mock.h"
#include "mongo/db/repl/repl_set_heartbeat_args.h"
#include "mongo/db/repl/repl_set_heartbeat_response.h"
#include "mongo/db/repl/replica_set_config.h"
#include "mongo/db/repl/replication_coordinator_external_state_mock.h"
#include "mongo/db/repl/replication_coordinator_impl.h"
#include "mongo/db/repl/replication_coordinator_test_fixture.h"
#include "mongo/executor/network_interface_mock.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
namespace {
using executor::NetworkInterfaceMock;
using executor::RemoteCommandRequest;
using executor::RemoteCommandResponse;
class ReplCoordElectTest : public ReplCoordTest {
protected:
void assertStartSuccess(const BSONObj& configDoc, const HostAndPort& selfHost);
void simulateEnoughHeartbeatsForElectability();
void simulateFreshEnoughForElectability();
};
void ReplCoordElectTest::assertStartSuccess(const BSONObj& configDoc, const HostAndPort& selfHost) {
ReplCoordTest::assertStartSuccess(addProtocolVersion(configDoc, 0), selfHost);
}
void ReplCoordElectTest::simulateEnoughHeartbeatsForElectability() {
ReplicationCoordinatorImpl* replCoord = getReplCoord();
ReplicaSetConfig rsConfig = replCoord->getReplicaSetConfig_forTest();
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
for (int i = 0; i < rsConfig.getNumMembers() - 1; ++i) {
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
const RemoteCommandRequest& request = noi->getRequest();
log() << request.target.toString() << " processing " << request.cmdObj;
ReplSetHeartbeatArgs hbArgs;
if (hbArgs.initialize(request.cmdObj).isOK()) {
ReplSetHeartbeatResponse hbResp;
hbResp.setSetName(rsConfig.getReplSetName());
hbResp.setState(MemberState::RS_SECONDARY);
hbResp.setConfigVersion(rsConfig.getConfigVersion());
BSONObjBuilder respObj;
respObj << "ok" << 1;
hbResp.addToBSON(&respObj, false);
net->scheduleResponse(noi, net->now(), makeResponseStatus(respObj.obj()));
} else {
error() << "Black holing unexpected request to " << request.target << ": "
<< request.cmdObj;
net->blackHole(noi);
}
net->runReadyNetworkOperations();
}
net->exitNetwork();
}
void ReplCoordElectTest::simulateFreshEnoughForElectability() {
ReplicationCoordinatorImpl* replCoord = getReplCoord();
ReplicaSetConfig rsConfig = replCoord->getReplicaSetConfig_forTest();
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
for (int i = 0; i < rsConfig.getNumMembers() - 1; ++i) {
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
const RemoteCommandRequest& request = noi->getRequest();
log() << request.target.toString() << " processing " << request.cmdObj;
if (request.cmdObj.firstElement().fieldNameStringData() == "replSetFresh") {
net->scheduleResponse(
noi,
net->now(),
makeResponseStatus(BSON("ok" << 1 << "fresher" << false << "opTime"
<< Date_t::fromMillisSinceEpoch(Timestamp(0, 0).asLL())
<< "veto" << false)));
} else {
error() << "Black holing unexpected request to " << request.target << ": "
<< request.cmdObj;
net->blackHole(noi);
}
net->runReadyNetworkOperations();
}
net->exitNetwork();
}
TEST_F(ReplCoordElectTest, ElectTooSoon) {
logger::globalLogDomain()->setMinimumLoggedSeverity(logger::LogSeverity::Debug(3));
// Election never starts because we haven't set a lastOpTimeApplied value yet, via a
// heartbeat.
startCapturingLogMessages();
assertStartSuccess(BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345"))),
HostAndPort("node1", 12345));
ASSERT(getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY));
simulateEnoughHeartbeatsForElectability();
stopCapturingLogMessages();
ASSERT_EQUALS(1, countLogLinesContaining("node has no applied oplog entries"));
}
/**
* This test checks that an election can happen when only one node is up, and it has the
* vote(s) to win.
*/
TEST_F(ReplCoordElectTest, ElectTwoNodesWithOneZeroVoter) {
OperationContextReplMock txn;
assertStartSuccess(
BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345"
<< "votes" << 0 << "hidden" << true << "priority" << 0))),
HostAndPort("node1", 12345));
getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY);
ASSERT(getReplCoord()->getMemberState().secondary())
<< getReplCoord()->getMemberState().toString();
getReplCoord()->setMyLastOptime(OpTime(Timestamp(10, 0), 0));
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
// blackhole heartbeat
net->scheduleResponse(noi, net->now(), ResponseStatus(ErrorCodes::OperationFailed, "timeout"));
net->runReadyNetworkOperations();
// blackhole freshness
const NetworkInterfaceMock::NetworkOperationIterator noi2 = net->getNextReadyRequest();
net->scheduleResponse(noi2, net->now(), ResponseStatus(ErrorCodes::OperationFailed, "timeout"));
net->runReadyNetworkOperations();
net->exitNetwork();
ASSERT(getReplCoord()->getMemberState().primary())
<< getReplCoord()->getMemberState().toString();
ASSERT(getReplCoord()->isWaitingForApplierToDrain());
// Since we're still in drain mode, expect that we report ismaster: false, issecondary:true.
IsMasterResponse imResponse;
getReplCoord()->fillIsMasterForReplSet(&imResponse);
ASSERT_FALSE(imResponse.isMaster()) << imResponse.toBSON().toString();
ASSERT_TRUE(imResponse.isSecondary()) << imResponse.toBSON().toString();
getReplCoord()->signalDrainComplete(&txn);
getReplCoord()->fillIsMasterForReplSet(&imResponse);
ASSERT_TRUE(imResponse.isMaster()) << imResponse.toBSON().toString();
ASSERT_FALSE(imResponse.isSecondary()) << imResponse.toBSON().toString();
}
TEST_F(ReplCoordElectTest, Elect1NodeSuccess) {
OperationContextReplMock txn;
startCapturingLogMessages();
assertStartSuccess(BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345"))),
HostAndPort("node1", 12345));
getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY);
ASSERT(getReplCoord()->getMemberState().primary())
<< getReplCoord()->getMemberState().toString();
ASSERT(getReplCoord()->isWaitingForApplierToDrain());
// Since we're still in drain mode, expect that we report ismaster: false, issecondary:true.
IsMasterResponse imResponse;
getReplCoord()->fillIsMasterForReplSet(&imResponse);
ASSERT_FALSE(imResponse.isMaster()) << imResponse.toBSON().toString();
ASSERT_TRUE(imResponse.isSecondary()) << imResponse.toBSON().toString();
getReplCoord()->signalDrainComplete(&txn);
getReplCoord()->fillIsMasterForReplSet(&imResponse);
ASSERT_TRUE(imResponse.isMaster()) << imResponse.toBSON().toString();
ASSERT_FALSE(imResponse.isSecondary()) << imResponse.toBSON().toString();
}
TEST_F(ReplCoordElectTest, ElectManyNodesSuccess) {
BSONObj configObj = BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345")
<< BSON("_id" << 3 << "host"
<< "node3:12345")));
assertStartSuccess(configObj, HostAndPort("node1", 12345));
OperationContextNoop txn;
getReplCoord()->setMyLastOptime(OpTime(Timestamp(100, 1), 0));
ASSERT(getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY));
startCapturingLogMessages();
simulateSuccessfulElection();
stopCapturingLogMessages();
ASSERT_EQUALS(1, countLogLinesContaining("election succeeded"));
}
TEST_F(ReplCoordElectTest, ElectNotEnoughVotes) {
// one responds with -10000 votes, and one doesn't respond, and we are not elected
startCapturingLogMessages();
BSONObj configObj = BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345")
<< BSON("_id" << 3 << "host"
<< "node3:12345")));
assertStartSuccess(configObj, HostAndPort("node1", 12345));
ReplicaSetConfig config = assertMakeRSConfig(configObj);
OperationContextNoop txn;
OpTime time1(Timestamp(100, 1), 0);
getReplCoord()->setMyLastOptime(time1);
ASSERT(getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY));
simulateEnoughHeartbeatsForElectability();
simulateFreshEnoughForElectability();
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
while (net->hasReadyRequests()) {
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
const RemoteCommandRequest& request = noi->getRequest();
log() << request.target.toString() << " processing " << request.cmdObj;
if (request.target != HostAndPort("node2", 12345)) {
net->blackHole(noi);
} else if (request.cmdObj.firstElement().fieldNameStringData() != "replSetElect") {
net->blackHole(noi);
} else {
net->scheduleResponse(
noi,
net->now(),
makeResponseStatus(BSON("ok" << 1 << "vote" << -10000 << "round" << OID())));
}
net->runReadyNetworkOperations();
}
net->exitNetwork();
stopCapturingLogMessages();
ASSERT_EQUALS(1, countLogLinesContaining("couldn't elect self, only received -9999 votes"));
}
TEST_F(ReplCoordElectTest, ElectWrongTypeForVote) {
// one responds with a bad 'vote' field, and one doesn't respond, and we are not elected
startCapturingLogMessages();
BSONObj configObj = BSON("_id"
<< "mySet"
<< "version" << 1 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345")
<< BSON("_id" << 3 << "host"
<< "node3:12345")));
assertStartSuccess(configObj, HostAndPort("node1", 12345));
ReplicaSetConfig config = assertMakeRSConfig(configObj);
OperationContextNoop txn;
OpTime time1(Timestamp(100, 1), 0);
getReplCoord()->setMyLastOptime(time1);
ASSERT(getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY));
simulateEnoughHeartbeatsForElectability();
simulateFreshEnoughForElectability();
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
while (net->hasReadyRequests()) {
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
const RemoteCommandRequest& request = noi->getRequest();
log() << request.target.toString() << " processing " << request.cmdObj;
if (request.target != HostAndPort("node2", 12345)) {
net->blackHole(noi);
} else if (request.cmdObj.firstElement().fieldNameStringData() != "replSetElect") {
net->blackHole(noi);
} else {
net->scheduleResponse(noi,
net->now(),
makeResponseStatus(BSON("ok" << 1 << "vote"
<< "yea"
<< "round" << OID())));
}
net->runReadyNetworkOperations();
}
net->exitNetwork();
stopCapturingLogMessages();
ASSERT_EQUALS(1,
countLogLinesContaining("wrong type for vote argument in replSetElect command"));
}
TEST_F(ReplCoordElectTest, ElectionDuringHBReconfigFails) {
// start up, receive reconfig via heartbeat while at the same time, become candidate.
// candidate state should be cleared.
OperationContextNoop txn;
assertStartSuccess(
BSON("_id"
<< "mySet"
<< "version" << 2 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345") << BSON("_id" << 3 << "host"
<< "node3:12345")
<< BSON("_id" << 4 << "host"
<< "node4:12345") << BSON("_id" << 5 << "host"
<< "node5:12345"))),
HostAndPort("node1", 12345));
ASSERT(getReplCoord()->setFollowerMode(MemberState::RS_SECONDARY));
getReplCoord()->setMyLastOptime(OpTime(Timestamp(100, 0), 0));
// set hbreconfig to hang while in progress
getExternalState()->setStoreLocalConfigDocumentToHang(true);
// hb reconfig
NetworkInterfaceMock* net = getNet();
net->enterNetwork();
ReplSetHeartbeatResponse hbResp2;
ReplicaSetConfig config;
config.initialize(BSON("_id"
<< "mySet"
<< "version" << 3 << "members"
<< BSON_ARRAY(BSON("_id" << 1 << "host"
<< "node1:12345")
<< BSON("_id" << 2 << "host"
<< "node2:12345"))));
hbResp2.setConfig(config);
hbResp2.setConfigVersion(3);
hbResp2.setSetName("mySet");
hbResp2.setState(MemberState::RS_SECONDARY);
BSONObjBuilder respObj2;
respObj2 << "ok" << 1;
hbResp2.addToBSON(&respObj2, false);
net->runUntil(net->now() + Seconds(10)); // run until we've sent a heartbeat request
const NetworkInterfaceMock::NetworkOperationIterator noi2 = net->getNextReadyRequest();
net->scheduleResponse(noi2, net->now(), makeResponseStatus(respObj2.obj()));
net->runReadyNetworkOperations();
getNet()->exitNetwork();
// prepare candidacy
BSONObjBuilder result;
ReplicationCoordinator::ReplSetReconfigArgs args;
args.force = false;
args.newConfigObj = config.toBSON();
ASSERT_EQUALS(ErrorCodes::ConfigurationInProgress,
getReplCoord()->processReplSetReconfig(&txn, args, &result));
logger::globalLogDomain()->setMinimumLoggedSeverity(logger::LogSeverity::Debug(2));
startCapturingLogMessages();
// receive sufficient heartbeats to trigger an election
ReplicationCoordinatorImpl* replCoord = getReplCoord();
ReplicaSetConfig rsConfig = replCoord->getReplicaSetConfig_forTest();
net->enterNetwork();
for (int i = 0; i < 2; ++i) {
const NetworkInterfaceMock::NetworkOperationIterator noi = net->getNextReadyRequest();
const RemoteCommandRequest& request = noi->getRequest();
log() << request.target.toString() << " processing " << request.cmdObj;
ReplSetHeartbeatArgs hbArgs;
if (hbArgs.initialize(request.cmdObj).isOK()) {
ReplSetHeartbeatResponse hbResp;
hbResp.setSetName(rsConfig.getReplSetName());
hbResp.setState(MemberState::RS_SECONDARY);
hbResp.setConfigVersion(rsConfig.getConfigVersion());
BSONObjBuilder respObj;
respObj << "ok" << 1;
hbResp.addToBSON(&respObj, false);
net->scheduleResponse(noi, net->now(), makeResponseStatus(respObj.obj()));
} else {
error() << "Black holing unexpected request to " << request.target << ": "
<< request.cmdObj;
net->blackHole(noi);
}
net->runReadyNetworkOperations();
}
stopCapturingLogMessages();
// ensure node does not stand for election
ASSERT_EQUALS(1,
countLogLinesContaining(
"Not standing for election; processing "
"a configuration change"));
getExternalState()->setStoreLocalConfigDocumentToHang(false);
}
}
}
}
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