MapReduce服务 MRS-修改表:代码样例

时间：2023-11-01 16:19:45

MapReduce服务 MRS

代码样例

以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testModifyTable方法中

public void testModifyTable() {    LOG.info("Entering testModifyTable.");    // Specify the column family name.    byte[] familyName = Bytes.toBytes("education");    Admin admin = null;    try {      // Instantiate an Admin object.      admin = conn.getAdmin();      // Obtain the table descriptor.      TableDescriptor htd = admin.getDescriptor(tableName);      // Check whether the column family is specified before modification.      if (!htd.hasColumnFamily(familyName)) {        // Create the column descriptor.        TableDescriptor tableBuilder = TableDescriptorBuilder.newBuilder(htd)                  .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(familyName).build()).build();        // Disable the table to get the table offline before modifying        // the table.        admin.disableTable(tableName);//注[1]        // Submit a modifyTable request.        admin.modifyTable(tableBuilder);        // Enable the table to get the table online after modifying the        // table.        admin.enableTable(tableName);      }      LOG.info("Modify table successfully.");    } catch (IOException e) {      LOG.error("Modify table failed " ,e);    } finally {      if (admin != null) {        try {          // Close the Admin object.          admin.close();        } catch (IOException e) {          LOG.error("Close admin failed " ,e);        }      }    }    LOG.info("Exiting testModifyTable.");  }

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