C++ VersionType::toBSON方法代码示例

/**
 * Upgrade v0 to v7 described here
 *
 * This upgrade takes the config server from empty to an initial version.
 */
bool doUpgradeV0ToV7(CatalogManager* catalogManager,
                     const VersionType& lastVersionInfo,
                     string* errMsg) {
    string dummy;
    if (!errMsg)
        errMsg = &dummy;

    verify(lastVersionInfo.getCurrentVersion() == UpgradeHistory_EmptyVersion);

    //
    // Even though the initial config write is a single-document update, that single document
    // is on multiple config servers and requests can interleave.  The upgrade lock prevents
    // this.
    //

    log() << "writing initial config version at v" << CURRENT_CONFIG_VERSION;

    OID newClusterId = OID::gen();

    VersionType versionInfo;

    // Upgrade to new version
    versionInfo.setMinCompatibleVersion(MIN_COMPATIBLE_CONFIG_VERSION);
    versionInfo.setCurrentVersion(CURRENT_CONFIG_VERSION);
    versionInfo.setClusterId(newClusterId);

    verify(versionInfo.isValid(NULL));

    // If the cluster has not previously been initialized, we need to set the version before
    // using so subsequent mongoses use the config data the same way.  This requires all three
    // config servers online initially.
    Status result = catalogManager->update(VersionType::ConfigNS,
                                           BSON("_id" << 1),
                                           versionInfo.toBSON(),
                                           true,   // upsert
                                           false,  // multi
                                           NULL);
    if (!result.isOK()) {
        *errMsg = stream() << "error writing initial config version: " << result.reason();
        return false;
    }

    return true;
}

    /**
     * Upgrade v3 to v4 described here.
     *
     * This upgrade takes a config server without collection epochs (potentially) and adds
     * epochs to all mongo processes.
     *
     */
    bool doUpgradeV3ToV4(const ConnectionString& configLoc,
                         const VersionType& lastVersionInfo,
                         string* errMsg)
    {
        string dummy;
        if (!errMsg) errMsg = &dummy;

        verify(lastVersionInfo.getCurrentVersion() == UpgradeHistory_NoEpochVersion);

        if (lastVersionInfo.isUpgradeIdSet() && lastVersionInfo.getUpgradeId().isSet()) {

            //
            // Another upgrade failed, so cleanup may be necessary
            //

            BSONObj lastUpgradeState = lastVersionInfo.getUpgradeState();

            bool inCriticalSection;
            if (!FieldParser::extract(lastUpgradeState,
                                      inCriticalSectionField,
                                      &inCriticalSection,
                                      errMsg))
            {

                *errMsg = stream() << "problem reading previous upgrade state" << causedBy(errMsg);

                return false;
            }

            if (inCriticalSection) {

                // Manual intervention is needed here.  Somehow our upgrade didn't get applied
                // consistently across config servers.

                *errMsg = cannotCleanupMessage;

                return false;
            }

            if (!_cleanupUpgradeState(configLoc, lastVersionInfo.getUpgradeId(), errMsg)) {
                
                // If we can't cleanup the old upgrade state, the user might have done it for us,
                // not a fatal problem (we'll just end up with extra collections).
                
                warning() << "could not cleanup previous upgrade state" << causedBy(errMsg) << endl;
                *errMsg = "";
            }
        }

        //
        // Check the versions of other mongo processes in the cluster before upgrade.
        // We can't upgrade if there are active pre-v2.2 processes in the cluster
        //

        Status mongoVersionStatus = checkClusterMongoVersions(configLoc,
                                                              string(minMongoProcessVersion));

        if (!mongoVersionStatus.isOK()) {

            *errMsg = stream() << "cannot upgrade with pre-v" << minMongoProcessVersion
                               << " mongo processes active in the cluster"
                               << causedBy(mongoVersionStatus);

            return false;
        }

        VersionType newVersionInfo;
        lastVersionInfo.cloneTo(&newVersionInfo);

        // Set our upgrade id and state
        OID upgradeId = OID::gen();
        newVersionInfo.setUpgradeId(upgradeId);
        newVersionInfo.setUpgradeState(BSONObj());

        // Write our upgrade id and state
        {
            scoped_ptr<ScopedDbConnection> connPtr;

            try {
                connPtr.reset(ScopedDbConnection::getInternalScopedDbConnection(configLoc, 30));
                ScopedDbConnection& conn = *connPtr;

                verify(newVersionInfo.isValid(NULL));

                conn->update(VersionType::ConfigNS,
                             BSON("_id" << 1 << VersionType::version_DEPRECATED(3)),
                             newVersionInfo.toBSON());
                _checkGLE(conn);
            }
            catch (const DBException& e) {

                *errMsg = stream() << "could not initialize version info for upgrade"
                                   << causedBy(e);
//.........这里部分代码省略.........

Status CatalogManagerReplicaSet::initConfigVersion(OperationContext* txn) {
    for (int x = 0; x < kMaxConfigVersionInitRetry; x++) {
        auto versionStatus = _getConfigVersion(txn);
        if (!versionStatus.isOK()) {
            return versionStatus.getStatus();
        }

        auto versionInfo = versionStatus.getValue();
        if (versionInfo.getMinCompatibleVersion() > CURRENT_CONFIG_VERSION) {
            return {ErrorCodes::IncompatibleShardingConfigVersion,
                    str::stream() << "current version v" << CURRENT_CONFIG_VERSION
                                  << " is older than the cluster min compatible v"
                                  << versionInfo.getMinCompatibleVersion()};
        }

        if (versionInfo.getCurrentVersion() == UpgradeHistory_EmptyVersion) {
            VersionType newVersion;
            newVersion.setClusterId(OID::gen());
            newVersion.setMinCompatibleVersion(MIN_COMPATIBLE_CONFIG_VERSION);
            newVersion.setCurrentVersion(CURRENT_CONFIG_VERSION);

            BSONObj versionObj(newVersion.toBSON());
            BatchedCommandResponse response;
            auto upsertStatus = update(txn,
                                       VersionType::ConfigNS,
                                       versionObj,
                                       versionObj,
                                       true /* upsert*/,
                                       false /* multi */,
                                       &response);

            if ((upsertStatus.isOK() && response.getN() < 1) ||
                upsertStatus == ErrorCodes::DuplicateKey) {
                // Do the check again as someone inserted a new config version document
                // and the upsert neither inserted nor updated a config version document.
                // Note: you can get duplicate key errors on upsert because of SERVER-14322.
                continue;
            }

            return upsertStatus;
        }

        if (versionInfo.getCurrentVersion() == UpgradeHistory_UnreportedVersion) {
            return {ErrorCodes::IncompatibleShardingConfigVersion,
                    "Assuming config data is old since the version document cannot be found in the "
                    "config server and it contains databases aside 'local' and 'admin'. "
                    "Please upgrade if this is the case. Otherwise, make sure that the config "
                    "server is clean."};
        }

        if (versionInfo.getCurrentVersion() < CURRENT_CONFIG_VERSION) {
            return {ErrorCodes::IncompatibleShardingConfigVersion,
                    str::stream() << "need to upgrade current cluster version to v"
                                  << CURRENT_CONFIG_VERSION << "; currently at v"
                                  << versionInfo.getCurrentVersion()};
        }

        return Status::OK();
    }

    return {ErrorCodes::IncompatibleShardingConfigVersion,
            str::stream() << "unable to create new config version document after "
                          << kMaxConfigVersionInitRetry << " retries"};
}

 /**
  * Stores a newer { version, minVersion, currentVersion, clusterId } config server entry
  */
 void storeConfigVersion(const VersionType& versionInfo) {
     DBDirectClient client(&_txn);
     client.insert(VersionType::ConfigNS, versionInfo.toBSON());
 }

 /**
  * Stores a newer { version, minVersion, currentVersion, clusterId } config server entry
  */
 void storeConfigVersion(const VersionType& versionInfo) {
     client().insert(VersionType::ConfigNS, versionInfo.toBSON());
 }