Querying a List of Secondary Indexes

Function Description

You can use the methods provided by org.apache.hadoop.hbase.hindex.client.HIndexAdmin to manage HIndexes. This class provides methods of listing all indexes of a table.

HIndexAdmin provides the following API for listing indexes in a specified table:

• listIndices (): This API can be used to list all indexes of a specified table.

Sample Code

The following code snippets are in the listIndicesIntable method in the HIndexExample class of the com.huawei.bigdata.hbase.examples packet.

  public void listIndicesIntable() {
    LOG.info("Entering Listing Hindex.");
    Admin admin = null;
    HIndexAdmin iAdmin = null;
    try {
      admin = conn.getAdmin();
      iAdmin = HIndexClient.newHIndexAdmin(admin);
      // Retreive the list of indices and print it
      List<Pair<HIndexSpecification, IndexState>> indicesList = iAdmin.listIndices(tableName);
      LOG.info("indicesList:" + indicesList);
      LOG.info("Successfully listed indices for table " + tableName + ".");
    } catch (IOException e) {
      LOG.error("Failed to list indices for table " + tableName + "." + e);
    } finally {
      if (iAdmin != null) {
        try {
          // Close the HIndexAdmin object.
          iAdmin.close();
        } catch (IOException e) {
          LOG.error("Failed to close HIndexAdmin ", e);
        }
      }
      if (admin != null) {
        try {
          // Close the Admin object.
          admin.close();
        } catch (IOException e) {
          LOG.error("Failed to close admin ", e);
        }
      }
    }
    LOG.info("Exiting Listing Hindex.");
  }