更新时间:2024-06-21 GMT+08:00

访问ThriftServer读数据

功能简介

传入ThriftServer实例所在host和提供服务的port,新建Thrift客户端,访问ThriftServer,分别使用get和scan进行读数据操作。

代码样例

  • 方法调用
    // Get data with single get.
    getData(client, TABLE_NAME);
    
    // Get data with getlist.
    getDataList(client, TABLE_NAME);
    
    // Scan data.
     scanData(client, TABLE_NAME);
  • 使用get进行读数据

    以下代码片段在“hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples”包的“ThriftSample”类的getData方法中。

    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.");
     }
  • 使用getlist进行读数据

    以下代码片段在“hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples”包的“ThriftSample”类的getDataList方法中。

    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.");
     }
  • 使用scan进行读数据

    以下代码片段在“hbase-thrift-example\src\main\java\com\huawei\hadoop\hbase\examples”包的“ThriftSample”类的scanData方法中。

    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.");
     }