Ejemplo n.º 1
0
  /**
   * Restore the specified snapshot. The restore will fail if the destination table has a snapshot
   * or restore in progress.
   *
   * @param reqSnapshot Snapshot Descriptor from request
   * @param tableName table to restore
   * @param snapshot Snapshot Descriptor
   * @param snapshotTableDesc Table Descriptor
   * @param nonceGroup unique value to prevent duplicated RPC
   * @param nonce unique value to prevent duplicated RPC
   * @return procId the ID of the restore snapshot procedure
   * @throws IOException
   */
  private long restoreSnapshot(
      final SnapshotDescription reqSnapshot,
      final TableName tableName,
      final SnapshotDescription snapshot,
      final HTableDescriptor snapshotTableDesc,
      final long nonceGroup,
      final long nonce)
      throws IOException {
    MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();

    if (master
        .getTableStateManager()
        .isTableState(TableName.valueOf(snapshot.getTable()), TableState.State.ENABLED)) {
      throw new UnsupportedOperationException(
          "Table '"
              + TableName.valueOf(snapshot.getTable())
              + "' must be disabled in order to "
              + "perform a restore operation.");
    }

    // call Coprocessor pre hook
    if (cpHost != null) {
      cpHost.preRestoreSnapshot(reqSnapshot, snapshotTableDesc);
    }

    long procId;
    try {
      procId = restoreSnapshot(snapshot, snapshotTableDesc, nonceGroup, nonce);
    } catch (IOException e) {
      LOG.error(
          "Exception occurred while restoring the snapshot "
              + snapshot.getName()
              + " as table "
              + tableName.getNameAsString(),
          e);
      throw e;
    }
    LOG.info("Restore snapshot=" + snapshot.getName() + " as table=" + tableName);

    if (cpHost != null) {
      cpHost.postRestoreSnapshot(reqSnapshot, snapshotTableDesc);
    }

    return procId;
  }
Ejemplo n.º 2
0
  /**
   * Take a snapshot based on the enabled/disabled state of the table.
   *
   * @param snapshot
   * @throws HBaseSnapshotException when a snapshot specific exception occurs.
   * @throws IOException when some sort of generic IO exception occurs.
   */
  public void takeSnapshot(SnapshotDescription snapshot) throws IOException {
    // check to see if we already completed the snapshot
    if (isSnapshotCompleted(snapshot)) {
      throw new SnapshotExistsException(
          "Snapshot '" + snapshot.getName() + "' already stored on the filesystem.",
          ProtobufUtil.createSnapshotDesc(snapshot));
    }

    LOG.debug("No existing snapshot, attempting snapshot...");

    // stop tracking "abandoned" handlers
    cleanupSentinels();

    // check to see if the table exists
    HTableDescriptor desc = null;
    try {
      desc = master.getTableDescriptors().get(TableName.valueOf(snapshot.getTable()));
    } catch (FileNotFoundException e) {
      String msg = "Table:" + snapshot.getTable() + " info doesn't exist!";
      LOG.error(msg);
      throw new SnapshotCreationException(msg, e, ProtobufUtil.createSnapshotDesc(snapshot));
    } catch (IOException e) {
      throw new SnapshotCreationException(
          "Error while geting table description for table " + snapshot.getTable(),
          e,
          ProtobufUtil.createSnapshotDesc(snapshot));
    }
    if (desc == null) {
      throw new SnapshotCreationException(
          "Table '" + snapshot.getTable() + "' doesn't exist, can't take snapshot.",
          ProtobufUtil.createSnapshotDesc(snapshot));
    }
    SnapshotDescription.Builder builder = snapshot.toBuilder();
    // if not specified, set the snapshot format
    if (!snapshot.hasVersion()) {
      builder.setVersion(SnapshotDescriptionUtils.SNAPSHOT_LAYOUT_VERSION);
    }
    User user = RpcServer.getRequestUser();
    if (User.isHBaseSecurityEnabled(master.getConfiguration()) && user != null) {
      builder.setOwner(user.getShortName());
    }
    snapshot = builder.build();

    // call pre coproc hook
    MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
    if (cpHost != null) {
      cpHost.preSnapshot(snapshot, desc);
    }

    // if the table is enabled, then have the RS run actually the snapshot work
    TableName snapshotTable = TableName.valueOf(snapshot.getTable());
    if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.ENABLED)) {
      LOG.debug("Table enabled, starting distributed snapshot.");
      snapshotEnabledTable(snapshot);
      LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
    }
    // For disabled table, snapshot is created by the master
    else if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.DISABLED)) {
      LOG.debug("Table is disabled, running snapshot entirely on master.");
      snapshotDisabledTable(snapshot);
      LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
    } else {
      LOG.error(
          "Can't snapshot table '"
              + snapshot.getTable()
              + "', isn't open or closed, we don't know what to do!");
      TablePartiallyOpenException tpoe =
          new TablePartiallyOpenException(snapshot.getTable() + " isn't fully open.");
      throw new SnapshotCreationException(
          "Table is not entirely open or closed", tpoe, ProtobufUtil.createSnapshotDesc(snapshot));
    }

    // call post coproc hook
    if (cpHost != null) {
      cpHost.postSnapshot(snapshot, desc);
    }
  }