private Log openLog(String logManagerName, String logName) {
   try {
     ModifiableConfiguration configuration =
         new ModifiableConfiguration(
             GraphDatabaseConfiguration.ROOT_NS,
             config.copy(),
             BasicConfiguration.Restriction.NONE);
     configuration.set(GraphDatabaseConfiguration.UNIQUE_INSTANCE_ID, "reader");
     configuration.set(
         GraphDatabaseConfiguration.LOG_READ_INTERVAL, Duration.ofMillis(500L), logManagerName);
     if (logStoreManager == null) {
       logStoreManager = Backend.getStorageManager(configuration);
     }
     StoreFeatures f = logStoreManager.getFeatures();
     boolean part = f.isDistributed() && f.isKeyOrdered();
     if (part) {
       for (String logname : new String[] {USER_LOG, TRANSACTION_LOG, MANAGEMENT_LOG})
         configuration.set(KCVSLogManager.LOG_MAX_PARTITIONS, 8, logname);
     }
     assert logStoreManager != null;
     if (!logManagers.containsKey(logManagerName)) {
       // Open log manager - only supports KCVSLog
       Configuration logConfig = configuration.restrictTo(logManagerName);
       Preconditions.checkArgument(
           logConfig.get(LOG_BACKEND).equals(LOG_BACKEND.getDefaultValue()));
       logManagers.put(logManagerName, new KCVSLogManager(logStoreManager, logConfig));
     }
     assert logManagers.containsKey(logManagerName);
     return logManagers.get(logManagerName).openLog(logName);
   } catch (BackendException e) {
     throw new TitanException("Could not open log: " + logName, e);
   }
 }
 public static void clearGraph(WriteConfiguration config) throws BackendException {
   ModifiableConfiguration adjustedConfig =
       new ModifiableConfiguration(
           GraphDatabaseConfiguration.ROOT_NS, config.copy(), BasicConfiguration.Restriction.NONE);
   adjustedConfig.set(GraphDatabaseConfiguration.LOCK_LOCAL_MEDIATOR_GROUP, "tmp");
   adjustedConfig.set(GraphDatabaseConfiguration.UNIQUE_INSTANCE_ID, "inst");
   Backend backend = new Backend(adjustedConfig);
   backend.initialize(adjustedConfig);
   backend.clearStorage();
 }
 public Configuration getConfig() {
   return new BasicConfiguration(
       GraphDatabaseConfiguration.ROOT_NS, config.copy(), BasicConfiguration.Restriction.NONE);
 }