Ejemplo n.º 1
0
  public Backend(Configuration storageConfig) {
    this.storageConfig = storageConfig;

    storeManager = getStorageManager(storageConfig);
    indexes = getIndexes(storageConfig);
    storeFeatures = storeManager.getFeatures();

    basicMetrics = storageConfig.getBoolean(BASIC_METRICS, BASIC_METRICS_DEFAULT);
    mergeBasicMetrics =
        storageConfig.getBoolean(MERGE_BASIC_METRICS_KEY, MERGE_BASIC_METRICS_DEFAULT);

    int bufferSizeTmp = storageConfig.getInt(BUFFER_SIZE_KEY, BUFFER_SIZE_DEFAULT);
    Preconditions.checkArgument(
        bufferSizeTmp >= 0, "Buffer size must be non-negative (use 0 to disable)");
    if (!storeFeatures.supportsBatchMutation()) {
      bufferSize = 0;
      log.debug("Buffering disabled because backend does not support batch mutations");
    } else bufferSize = bufferSizeTmp;

    writeAttempts = storageConfig.getInt(WRITE_ATTEMPTS_KEY, WRITE_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(writeAttempts > 0, "Write attempts must be positive");
    readAttempts = storageConfig.getInt(READ_ATTEMPTS_KEY, READ_ATTEMPTS_DEFAULT);
    Preconditions.checkArgument(readAttempts > 0, "Read attempts must be positive");
    persistAttemptWaittime =
        storageConfig.getInt(STORAGE_ATTEMPT_WAITTIME_KEY, STORAGE_ATTEMPT_WAITTIME_DEFAULT);
    Preconditions.checkArgument(
        persistAttemptWaittime > 0, "Persistence attempt retry wait time must be non-negative");

    // If lock prefix is unspecified, specify it now
    storageConfig.setProperty(
        ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY,
        storageConfig.getString(
            ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY, storeManager.getName()));

    final String lockBackendName =
        storageConfig.getString(
            GraphDatabaseConfiguration.LOCK_BACKEND,
            GraphDatabaseConfiguration.LOCK_BACKEND_DEFAULT);
    if (REGISTERED_LOCKERS.containsKey(lockBackendName)) {
      lockerCreator = REGISTERED_LOCKERS.get(lockBackendName);
    } else {
      throw new TitanConfigurationException(
          "Unknown lock backend \""
              + lockBackendName
              + "\".  Known lock backends: "
              + Joiner.on(", ").join(REGISTERED_LOCKERS.keySet())
              + ".");
    }
    // Never used for backends that have innate transaction support, but we
    // want to maintain the non-null invariant regardless; it will default
    // to connsistentkey impl if none is specified
    Preconditions.checkNotNull(lockerCreator);

    if (storeFeatures.isDistributed() && storeFeatures.isKeyOrdered()) {
      log.debug("Wrapping index store with HashPrefix");
      hashPrefixIndex = true;
    } else {
      hashPrefixIndex = false;
    }
  }
Ejemplo n.º 2
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        @Override
        public Locker apply(String lockerName) {

          String expectedManagerName =
              "com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager";
          String actualManagerName = storeManager.getClass().getCanonicalName();
          // Require AstyanaxStoreManager
          Preconditions.checkArgument(
              expectedManagerName.equals(actualManagerName),
              "Astyanax Recipe locker is only supported with the Astyanax storage backend (configured:"
                  + actualManagerName
                  + " != required:"
                  + expectedManagerName
                  + ")");

          try {
            Class<?> c = storeManager.getClass();
            Method method = c.getMethod("openLocker", String.class);
            Object o = method.invoke(storeManager, lockerName);
            return (Locker) o;
          } catch (NoSuchMethodException e) {
            throw new IllegalArgumentException(
                "Could not find method when configuring locking with Astyanax Recipes");
          } catch (IllegalAccessException e) {
            throw new IllegalArgumentException(
                "Could not access method when configuring locking with Astyanax Recipes", e);
          } catch (InvocationTargetException e) {
            throw new IllegalArgumentException(
                "Could not invoke method when configuring locking with Astyanax Recipes", e);
          }
        }
Ejemplo n.º 3
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 private KeyColumnValueStore getBufferStore(String name) throws StorageException {
   Preconditions.checkArgument(
       bufferSize <= 1 || storeManager.getFeatures().supportsBatchMutation());
   KeyColumnValueStore store = null;
   store = storeManager.openDatabase(name);
   if (bufferSize > 1) {
     store = new BufferedKeyColumnValueStore(store, true);
   }
   // Enable cache
   store = new CachedKeyColumnValueStore(store);
   return store;
 }
Ejemplo n.º 4
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 /**
  * Clears the storage of all registered backend data providers. This includes backend storage
  * engines and index providers.
  *
  * <p>IMPORTANT: Clearing storage means that ALL data will be lost and cannot be recovered.
  *
  * @throws StorageException
  */
 public void clearStorage() throws StorageException {
   edgeStore.close();
   vertexIndexStore.close();
   edgeIndexStore.close();
   idAuthority.close();
   storeManager.clearStorage();
   // Indexes
   for (IndexProvider index : indexes.values()) index.clearStorage();
 }
Ejemplo n.º 5
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  /**
   * Opens a new transaction against all registered backend system wrapped in one {@link
   * BackendTransaction}.
   *
   * @return
   * @throws StorageException
   */
  public BackendTransaction beginTransaction(TransactionConfiguration configuration)
      throws StorageException {
    StoreTxConfig txConfig = new StoreTxConfig(configuration.getMetricsPrefix());
    if (configuration.hasTimestamp()) txConfig.setTimestamp(configuration.getTimestamp());
    StoreTransaction tx = storeManager.beginTransaction(txConfig);
    if (bufferSize > 1) {
      Preconditions.checkArgument(storeManager.getFeatures().supportsBatchMutation());
      tx =
          new BufferTransaction(
              tx, storeManager, bufferSize, writeAttempts, persistAttemptWaittime);
    }
    if (!storeFeatures.supportsLocking()) {
      if (storeFeatures.supportsTransactions()) {
        // No transaction wrapping needed
      } else if (storeFeatures.supportsConsistentKeyOperations()) {
        txConfig =
            new StoreTxConfig(ConsistencyLevel.KEY_CONSISTENT, configuration.getMetricsPrefix());
        if (configuration.hasTimestamp()) txConfig.setTimestamp(configuration.getTimestamp());
        tx =
            new ExpectedValueCheckingTransaction(
                tx, storeManager.beginTransaction(txConfig), readAttempts);
      }
    }

    // Index transactions
    Map<String, IndexTransaction> indexTx = new HashMap<String, IndexTransaction>(indexes.size());
    for (Map.Entry<String, IndexProvider> entry : indexes.entrySet()) {
      indexTx.put(entry.getKey(), new IndexTransaction(entry.getValue()));
    }

    return new BackendTransaction(
        tx,
        storeManager.getFeatures(),
        edgeStore,
        vertexIndexStore,
        edgeIndexStore,
        readAttempts,
        persistAttemptWaittime,
        indexTx);
  }
Ejemplo n.º 6
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 /**
  * Returns the {@link StoreFeatures} of the configured backend storage engine.
  *
  * @return
  */
 public StoreFeatures getStoreFeatures() {
   return storeManager.getFeatures();
 }
Ejemplo n.º 7
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 private KeyColumnValueStore getStore(String name) throws StorageException {
   KeyColumnValueStore store = storeManager.openDatabase(name);
   return store;
 }