Updated on 2024-06-21 GMT+08:00

Accessing Thrift Server to Read Data

Function Description

Input the host where the ThriftServer instance is located and the port that provides services, create a Thrift client, access the Thrift Server instance, and use the GET and Scan commands to read data.

Example Code

  • Invoking methods
    // Get data with single get.
    getData(client, TABLE_NAME);
    
    // Get data with getlist.
    getDataList(client, TABLE_NAME);
    
    // Scan data.
     scanData(client, TABLE_NAME);
  • Using the get method to write data.

    The following code snippets are in the getData method in the ThriftSample class of the hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples packet.

    private void getData(THBaseService.Iface client, String tableName) throws TException {
         LOGGER.info("Test getData.");
         TGet get = new TGet();
         get.setRow("row1".getBytes());
    
         ByteBuffer table = ByteBuffer.wrap(tableName.getBytes());
         TResult result = client.get(table, get);
         printResult(result);
         LOGGER.info("Test getData done.");
     }
  • Using getlist to read data

    The following code snippets are in the getDataList method in the ThriftSample class of the hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples packet.

    private void getDataList(THBaseService.Iface client, String tableName) throws TException {
         LOGGER.info("Test getDataList.");
         List<TGet> getList = new ArrayList<>();
         TGet get1 = new TGet();
         get1.setRow("row1".getBytes());
         getList.add(get1);
    
         TGet get2 = new TGet();
         get2.setRow("row2".getBytes());
         getList.add(get2);
    
         ByteBuffer table = ByteBuffer.wrap(tableName.getBytes());
         List<TResult> resultList = client.getMultiple(table, getList);
         for (TResult tResult : resultList) {
             printResult(tResult);
         }
         LOGGER.info("Test getDataList done.");
     }
  • Using the scan method to write data

    The following code snippets are in the scanData method in the ThriftSample class of the hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples packet.

    private void scanData(THBaseService.Iface client, String tableName) throws TException {
         LOGGER.info("Test scanData.");
         int scannerId = -1;
         try {
             ByteBuffer table = ByteBuffer.wrap(tableName.getBytes());
             TScan scan = new TScan();
             scan.setLimit(500);
             scannerId = client.openScanner(table, scan);
             List<TResult> resultList = client.getScannerRows(scannerId, 100);
             while (resultList != null && !resultList.isEmpty()) {
                 for (TResult tResult : resultList) {
                     printResult(tResult);
                 }
                 resultList = client.getScannerRows(scannerId, 100);
             }
         } finally {
             if (scannerId != -1) {
                 client.closeScanner(scannerId);
                 LOGGER.info("Closed scanner {}.", scannerId);
             }
         }
         LOGGER.info("Test scanData done.");
     }