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/**
* Copyright (C) 2008 10gen 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.
*/
#include "mongo/db/commands.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/master_slave.h" // replSettings
#include "mongo/db/repl/replication_coordinator_global.h"
namespace mongo {
using std::string;
using std::stringstream;
namespace repl {
namespace {
constexpr StringData kResyncFieldName = "resync"_sd;
constexpr StringData kWaitFieldName = "wait"_sd;
} // namespace
// operator requested resynchronization of replication (on a slave or secondary). {resync: 1}
class CmdResync : public ErrmsgCommandDeprecated {
public:
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::resync);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
void help(stringstream& h) const {
h << "resync (from scratch) a stale slave or replica set secondary node.\n";
}
CmdResync() : ErrmsgCommandDeprecated(kResyncFieldName) {}
virtual bool errmsgRun(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
bool waitForResync = !cmdObj.hasField(kWaitFieldName) || cmdObj[kWaitFieldName].trueValue();
// Replica set resync.
ReplicationCoordinator* replCoord = ReplicationCoordinator::get(opCtx);
if (replCoord->getSettings().usingReplSets()) {
// Resync is disabled in production on replica sets until it stabilizes (SERVER-27081).
if (!Command::testCommandsEnabled) {
return CommandHelpers::appendCommandStatus(
result,
Status(ErrorCodes::OperationFailed,
"Replica sets do not support the resync command"));
}
{
// Need global write lock to transition out of SECONDARY
Lock::GlobalWrite globalWriteLock(opCtx);
const MemberState memberState = replCoord->getMemberState();
if (memberState.startup()) {
return CommandHelpers::appendCommandStatus(
result, Status(ErrorCodes::NotYetInitialized, "no replication yet active"));
}
if (memberState.primary()) {
return CommandHelpers::appendCommandStatus(
result, Status(ErrorCodes::NotSecondary, "primaries cannot resync"));
}
auto status = replCoord->setFollowerMode(MemberState::RS_STARTUP2);
if (!status.isOK()) {
return CommandHelpers::appendCommandStatus(
result,
status.withContext(
"Failed to transition to STARTUP2 state to perform resync"));
}
}
uassertStatusOKWithLocation(replCoord->resyncData(opCtx, waitForResync), "resync", 0);
return true;
}
// Master/Slave resync.
Lock::GlobalWrite globalWriteLock(opCtx);
// below this comment pertains only to master/slave replication
if (cmdObj.getBoolField("force")) {
if (!waitForSyncToFinish(opCtx, errmsg))
return false;
replAllDead = "resync forced";
}
// TODO(dannenberg) replAllDead is bad and should be removed when masterslave is removed
if (!replAllDead) {
errmsg = "not dead, no need to resync";
return false;
}
if (!waitForSyncToFinish(opCtx, errmsg))
return false;
ReplSource::forceResyncDead(opCtx, "client");
result.append("info", "triggered resync for all sources");
return true;
}
bool waitForSyncToFinish(OperationContext* opCtx, string& errmsg) const {
// Wait for slave thread to finish syncing, so sources will be be
// reloaded with new saved state on next pass.
Timer t;
while (1) {
if (syncing.load() == 0 || t.millis() > 30000)
break;
{
Lock::TempRelease t(opCtx->lockState());
relinquishSyncingSome.store(1);
sleepmillis(1);
}
}
if (syncing.load()) {
errmsg = "timeout waiting for sync() to finish";
return false;
}
return true;
}
} cmdResync;
} // namespace repl
} // namespace mongo
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