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/**
* Copyright (C) 2013 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::kSharding
#include "mongo/s/config_upgrade.h"
#include "mongo/client/connpool.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/s/cluster_client_internal.h"
#include "mongo/s/cluster_write.h"
#include "mongo/s/config_upgrade_helpers.h"
#include "mongo/s/type_locks.h"
#include "mongo/util/log.h"
namespace mongo {
using std::list;
using std::string;
using std::vector;
static const char* minMongoProcessVersion = "2.6";
static const char* cannotCleanupMessage =
"\n\n"
"******\n"
"Cannot upgrade config database from v5 to v6 because a previous upgrade\n"
"failed in the critical section. Manual intervention is required to re-sync\n"
"the config servers.\n"
"******\n";
namespace {
/**
* Returns false if the { ts: 1 } unique index does not exist. Returns true if it does
* or cannot confirm that it does due to errors.
*/
bool hasBadIndex(const ConnectionString& configLoc,
string* errMsg) {
const BSONObj lockIdxKey = BSON(LocksType::lockID() << 1);
const NamespaceString indexNS(LocksType::ConfigNS);
vector<HostAndPort> configHosts = configLoc.getServers();
for (vector<HostAndPort>::const_iterator configIter = configHosts.begin();
configIter != configHosts.end(); ++configIter) {
list<BSONObj> indexSpecs;
try {
ScopedDbConnection conn(*configIter);
indexSpecs = conn->getIndexSpecs(indexNS);
conn.done();
}
catch (const DBException& ex) {
*errMsg = str::stream() << "error while checking { ts: 1 } index"
<< causedBy(ex);
return true;
}
for (list<BSONObj>::const_iterator idxIter = indexSpecs.begin();
idxIter != indexSpecs.end(); ++idxIter) {
BSONObj indexSpec(*idxIter);
if (indexSpec["key"].Obj().woCompare(lockIdxKey) == 0) {
if (indexSpec["unique"].trueValue()) {
*errMsg = str::stream() << "unique { ts: 1 } index still exists in "
<< configIter->toString();
return true;
}
}
}
}
return false;
}
}
/**
* Upgrades v5 to v6.
*/
bool doUpgradeV5ToV6(const ConnectionString& configLoc,
const VersionType& lastVersionInfo,
string* errMsg)
{
string dummy;
if (!errMsg) errMsg = &dummy;
verify(lastVersionInfo.getCurrentVersion() == UpgradeHistory_DummyBumpPre2_6);
Status result = preUpgradeCheck(configLoc, lastVersionInfo, minMongoProcessVersion);
if (!result.isOK()) {
if (result.code() == ErrorCodes::ManualInterventionRequired) {
*errMsg = cannotCleanupMessage;
}
else {
*errMsg = result.toString();
}
return false;
}
// This is not needed because we are not actually going to make any modifications
// on the other collections in the config server for this particular upgrade.
// startConfigUpgrade(configLoc.toString(),
// lastVersionInfo.getCurrentVersion(),
// OID::gen());
// If we actually need to modify something in the config servers these need to follow
// after calling startConfigUpgrade(...):
//
// 1. Acquire necessary locks.
// 2. Make a backup of the collections we are about to modify.
// 3. Perform the upgrade process on the backup collection.
// 4. Verify that no changes were made to the collections since the backup was performed.
// 5. Call enterConfigUpgradeCriticalSection(configLoc.toString(),
// lastVersionInfo.getCurrentVersion()).
// 6. Rename the backup collection to the name of the original collection with
// dropTarget set to true.
// Make sure the { ts: 1 } index is not unique by dropping the existing one
// and rebuilding the index with the right specification.
const BSONObj lockIdxKey = BSON(LocksType::lockID() << 1);
const NamespaceString indexNS(LocksType::ConfigNS);
bool dropOk = false;
try {
ScopedDbConnection conn(configLoc);
BSONObj dropResponse;
dropOk = conn->runCommand(indexNS.db().toString(),
BSON("dropIndexes" << indexNS.coll()
<< "index" << lockIdxKey),
dropResponse);
conn.done();
}
catch (const DBException& ex) {
if (ex.getCode() == 13105) {
// 13105 is the exception code from SyncClusterConnection::findOne that gets
// thrown when one of the command responses has an "ok" field that is not true.
dropOk = false;
}
else {
*errMsg = str::stream() << "Failed to drop { ts: 1 } index" << causedBy(ex);
return false;
}
}
if (!dropOk && hasBadIndex(configLoc, errMsg)) {
// Fail only if the index still exists.
return false;
}
result = clusterCreateIndex(LocksType::ConfigNS,
BSON(LocksType::lockID() << 1),
false, // unique
NULL);
if (!result.isOK()) {
*errMsg = str::stream() << "error while creating { ts: 1 } index on config db"
<< causedBy(result);
return false;
}
LOG(1) << "Checking to make sure that the right { ts: 1 } index is created...";
if (hasBadIndex(configLoc, errMsg)) {
return false;
}
// We're only after the version bump in commitConfigUpgrade here since we never
// get into the critical section.
Status commitStatus = commitConfigUpgrade(configLoc.toString(),
lastVersionInfo.getCurrentVersion(),
MIN_COMPATIBLE_CONFIG_VERSION,
CURRENT_CONFIG_VERSION);
if (!commitStatus.isOK()) {
*errMsg = commitStatus.toString();
return false;
}
return true;
}
}
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