public void close() throws IOException, InterruptedException {
   m_saveFile.close();
   for (final Thread t : m_converterThreads) {
     t.interrupt();
     t.join();
   }
 }
Exemple #2
0
  /**
   * Takes a snapshot of all the tables in the database now and check all the rows in each table to
   * see if they satisfy the constraints. The constraints should be added with the table name and
   * table id 0.
   *
   * <p>Since the snapshot files reside on the servers, we have to copy them over to the client in
   * order to check. This might be an overkill, but the alternative is to ask the user to write
   * stored procedure for each table and execute them on all nodes. That's not significantly better,
   * either.
   *
   * <p>This function blocks. Should only be run at the end.
   *
   * @return true if all tables passed the test, false otherwise.
   */
  protected boolean checkTables() {
    String dir = "/tmp";
    String nonce = "data_verification";
    ClientConfig clientConfig = new ClientConfig(m_username, m_password);
    clientConfig.setExpectedOutgoingMessageSize(getExpectedOutgoingMessageSize());
    clientConfig.setHeavyweight(false);

    Client client = ClientFactory.createClient(clientConfig);
    // Host ID to IP mappings
    LinkedHashMap<Integer, String> hostMappings = new LinkedHashMap<Integer, String>();
    /*
     *  The key is the table name. the first one in the pair is the hostname,
     *  the second one is file name
     */
    LinkedHashMap<String, Pair<String, String>> snapshotMappings =
        new LinkedHashMap<String, Pair<String, String>>();
    boolean isSatisfied = true;

    // Load the native library for loading table from snapshot file
    org.voltdb.EELibraryLoader.loadExecutionEngineLibrary(true);

    try {
      boolean keepTrying = true;
      VoltTable[] response = null;

      client.createConnection(m_host);
      // Only initiate the snapshot if it's the first client
      while (m_id == 0) {
        // Take a snapshot of the database. This call is blocking.
        response = client.callProcedure("@SnapshotSave", dir, nonce, 1).getResults();
        if (response.length != 1
            || !response[0].advanceRow()
            || !response[0].getString("RESULT").equals("SUCCESS")) {
          if (keepTrying && response[0].getString("ERR_MSG").contains("ALREADY EXISTS")) {
            client.callProcedure("@SnapshotDelete", new String[] {dir}, new String[] {nonce});
            keepTrying = false;
            continue;
          }

          System.err.println("Failed to take snapshot");
          return false;
        }

        break;
      }

      // Clients other than the one that initiated the snapshot
      // have to check if the snapshot has completed
      if (m_id > 0) {
        int maxTry = 10;

        while (maxTry-- > 0) {
          boolean found = false;
          response = client.callProcedure("@SnapshotStatus").getResults();
          if (response.length != 2) {
            System.err.println("Failed to get snapshot status");
            return false;
          }
          while (response[0].advanceRow()) {
            if (response[0].getString("NONCE").equals(nonce)) {
              found = true;
              break;
            }
          }

          if (found) {
            // This probably means the snapshot is done
            if (response[0].getLong("END_TIME") > 0) break;
          }

          try {
            Thread.sleep(500);
          } catch (InterruptedException e) {
            return false;
          }
        }
      }

      // Get host ID to hostname mappings
      response = client.callProcedure("@SystemInformation").getResults();
      if (response.length != 1) {
        System.err.println("Failed to get host ID to IP address mapping");
        return false;
      }
      while (response[0].advanceRow()) {
        if (!response[0].getString("KEY").equals("HOSTNAME")) {
          continue;
        }
        hostMappings.put(
            (Integer) response[0].get("HOST_ID", VoltType.INTEGER), response[0].getString("VALUE"));
      }

      /* DUMP THE HOST MAPPINGS:
      System.err.println("\n\nhostMappings: ");
      for (Integer i : hostMappings.keySet()) {
          System.err.println("\tkey: " + i + " value: " + hostMappings.get(i));
      }
      */

      // Do a scan to get all the file names and table names
      response = client.callProcedure("@SnapshotScan", dir).getResults();
      if (response.length != 3) {
        System.err.println("Failed to get snapshot filenames");
        return false;
      }

      // Only copy the snapshot files we just created
      while (response[0].advanceRow()) {
        if (!response[0].getString("NONCE").equals(nonce)) continue;

        String[] tables = response[0].getString("TABLES_REQUIRED").split(",");
        for (String t : tables) {
          snapshotMappings.put(t, null);
        }
        break;
      }

      /* DUMP THE SNAPSHOT MAPPINGS:
      System.err.println("\n\nsnapshotMappings: ");
      for (String i : snapshotMappings.keySet()) {
          System.err.println("\tkey: " + i + " value: " + snapshotMappings.get(i));
      }
      */

      while (response[2].advanceRow()) {
        int id = (Integer) response[2].get("HOST_ID", VoltType.INTEGER);
        String tableName = response[2].getString("TABLE");
        if (!snapshotMappings.containsKey(tableName) || !hostMappings.containsKey(id)) {
          System.err.println("FAILED configuring snapshotMappings for: ");
          System.err.println(
              "snapshottingMapping[" + tableName + "] " + snapshotMappings.get(tableName));
          System.err.println("hostMappings[" + id + "] " + hostMappings.get(id));
          continue;
        }

        snapshotMappings.put(
            tableName, Pair.of(hostMappings.get(id), response[2].getString("NAME")));
      }
    } catch (NoConnectionsException e) {
      e.printStackTrace();
      return false;
    } catch (ProcCallException e) {
      e.printStackTrace();
      return false;
    } catch (UnknownHostException e) {
      e.printStackTrace();
      return false;
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }

    // Iterate through all the tables
    System.err.println("Checking " + m_tableCheckOrder.size() + " table contraints");
    for (String tableName : m_tableCheckOrder) {
      Pair<String, String> value = snapshotMappings.get(tableName);
      if (value == null) {
        System.err.println("No snapshot mapping for table: " + tableName);
        continue;
      }

      String hostName = value.getFirst();
      File file = new File(dir, value.getSecond());
      FileInputStream inputStream = null;
      TableSaveFile saveFile = null;
      long rowCount = 0;

      Pair<String, Integer> key = Pair.of(tableName, 0);
      if (!m_constraints.containsKey(key) || hostName == null) {
        System.err.println("No constraint for : " + tableName);
        continue;
      }

      // Copy the file over
      String localhostName = ConnectionUtil.getHostnameOrAddress();
      final SSHTools ssh = new SSHTools(m_username);
      if (!hostName.equals("localhost") && !hostName.equals(localhostName)) {
        if (!ssh.copyFromRemote(file.getPath(), hostName, file.getPath())) {
          System.err.println(
              "Failed to copy the snapshot file " + file.getPath() + " from host " + hostName);
          return false;
        }
      }

      if (!file.exists()) {
        System.err.println(
            "Snapshot file "
                + file.getPath()
                + " cannot be copied from "
                + hostName
                + " to localhost");
        return false;
      }

      try {
        try {
          inputStream = new FileInputStream(file);
          saveFile = new TableSaveFile(inputStream.getChannel(), 3, null);

          // Get chunks from table
          while (isSatisfied && saveFile.hasMoreChunks()) {
            final BBContainer chunk = saveFile.getNextChunk();
            VoltTable table = null;

            // This probably should not happen
            if (chunk == null) continue;

            table = PrivateVoltTableFactory.createVoltTableFromBuffer(chunk.b, true);
            // Now, check each row
            while (isSatisfied && table.advanceRow()) {
              isSatisfied = Verification.checkRow(m_constraints.get(key), table);
              rowCount++;
            }
            // Release the memory of the chunk we just examined, be good
            chunk.discard();
          }
        } finally {
          if (saveFile != null) {
            saveFile.close();
          }
          if (inputStream != null) inputStream.close();
          if (!hostName.equals("localhost") && !hostName.equals(localhostName) && !file.delete())
            System.err.println("Failed to delete snapshot file " + file.getPath());
        }
      } catch (FileNotFoundException e) {
        e.printStackTrace();
        return false;
      } catch (IOException e) {
        e.printStackTrace();
        return false;
      }

      if (isSatisfied) {
        System.err.println("Table " + tableName + " with " + rowCount + " rows passed check");
      } else {
        System.err.println("Table " + tableName + " failed check");
        break;
      }
    }

    // Clean up the snapshot we made
    try {
      if (m_id == 0) {
        client
            .callProcedure("@SnapshotDelete", new String[] {dir}, new String[] {nonce})
            .getResults();
      }
    } catch (IOException e) {
      e.printStackTrace();
    } catch (ProcCallException e) {
      e.printStackTrace();
    }

    System.err.println(
        "Table checking finished " + (isSatisfied ? "successfully" : "with failures"));

    return isSatisfied;
  }