Examples of org.apache.hadoop.hbase.HColumnDescriptor

org.apache.hadoop.hbase.HColumnDescriptor
An HColumnDescriptor contains information about a column family such as the number of versions, compression settings, etc. It is used as input when creating a table or adding a column. Once set, the parameters that specify a column cannot be changed without deleting the column and recreating it. If there is data stored in the column, it will be deleted when the column is deleted.

    if (admin.tableExists(tableName)) {
      admin.disableTable(tableName);
      admin.deleteTable(tableName);
    }
    HTableDescriptor htd = new HTableDescriptor(tableName);
    htd.addFamily(new HColumnDescriptor(family1));
    htd.addFamily(new HColumnDescriptor(family2));
    admin.createTable(htd);


    // create temp users
    User user = User.createUserForTesting(TEST_UTIL.getConfiguration(), "user", new String[0]);

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    if (admin.tableExists(tableName)) {
      admin.disableTable(tableName);
      admin.deleteTable(tableName);
    }
    HTableDescriptor htd = new HTableDescriptor(tableName);
    htd.addFamily(new HColumnDescriptor(family1));
    htd.addFamily(new HColumnDescriptor(family2));
    htd.setOwner(USER_OWNER);
    admin.createTable(htd);


    List<UserPermission> perms;
    HTable acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);

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    HTable table = new HTable(TEST_UTIL.getConfiguration(), tableName);


    // Add one column family and put some data in it
    admin.disableTable(tableName);
    admin.addColumn(tableName, new HColumnDescriptor(TEST_FAMILY2));
    admin.enableTable(tableName);
    assertEquals(2, table.getTableDescriptor().getFamilies().size());
    HTableDescriptor htd = admin.getTableDescriptor(tableName);
    assertEquals(2, htd.getFamilies().size());
    loadData(table, 500, TEST_FAMILY2);

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  //  Helpers
  // ==========================================================================
  private void createTable(final byte[] tableName, final byte[]... families) throws IOException {
    HTableDescriptor htd = new HTableDescriptor(tableName);
    for (byte[] family: families) {
      HColumnDescriptor hcd = new HColumnDescriptor(family);
      htd.addFamily(hcd);
    }
    byte[][] splitKeys = new byte[16][];
    byte[] hex = Bytes.toBytes("0123456789abcdef");
    for (int i = 0; i < 16; ++i) {

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  //  Helpers
  // ==========================================================================
  private void createTable(final byte[] tableName, final byte[]... families) throws IOException {
    HTableDescriptor htd = new HTableDescriptor(tableName);
    for (byte[] family: families) {
      HColumnDescriptor hcd = new HColumnDescriptor(family);
      htd.addFamily(hcd);
    }
    byte[][] splitKeys = new byte[16][];
    byte[] hex = Bytes.toBytes("0123456789abcdef");
    for (int i = 0; i < 16; ++i) {

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        Bytes.toBytes("iii"), Bytes.toBytes("jjj")
    };


    byte [] enabledTable = Bytes.toBytes("enabledTable");
    HTableDescriptor htdEnabled = new HTableDescriptor(enabledTable);
    htdEnabled.addFamily(new HColumnDescriptor(FAMILY));


    FileSystem filesystem = FileSystem.get(conf);
    Path rootdir = filesystem.makeQualified(
        new Path(conf.get(HConstants.HBASE_DIR)));
    // Write the .tableinfo
    FSTableDescriptors.createTableDescriptor(filesystem, rootdir, htdEnabled);


    HRegionInfo hriEnabled = new HRegionInfo(htdEnabled.getName(), null, null);
    createRegion(hriEnabled, rootdir, conf, htdEnabled);


    List<HRegionInfo> enabledRegions = TEST_UTIL.createMultiRegionsInMeta(
        TEST_UTIL.getConfiguration(), htdEnabled, SPLIT_KEYS);


    byte [] disabledTable = Bytes.toBytes("disabledTable");
    HTableDescriptor htdDisabled = new HTableDescriptor(disabledTable);
    htdDisabled.addFamily(new HColumnDescriptor(FAMILY));
    // Write the .tableinfo
    FSTableDescriptors.createTableDescriptor(filesystem, rootdir, htdDisabled);
    HRegionInfo hriDisabled = new HRegionInfo(htdDisabled.getName(), null, null);
    createRegion(hriDisabled, rootdir, conf, htdDisabled);
    List<HRegionInfo> disabledRegions = TEST_UTIL.createMultiRegionsInMeta(

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        Bytes.toBytes("iii"), Bytes.toBytes("jjj")
    };


    byte [] enabledTable = Bytes.toBytes("enabledTable");
    HTableDescriptor htdEnabled = new HTableDescriptor(enabledTable);
    htdEnabled.addFamily(new HColumnDescriptor(FAMILY));
    FileSystem filesystem = FileSystem.get(conf);
    Path rootdir = filesystem.makeQualified(
           new Path(conf.get(HConstants.HBASE_DIR)));
    // Write the .tableinfo
    FSTableDescriptors.createTableDescriptor(filesystem, rootdir, htdEnabled);
    HRegionInfo hriEnabled = new HRegionInfo(htdEnabled.getName(),
        null, null);
    createRegion(hriEnabled, rootdir, conf, htdEnabled);


    List<HRegionInfo> enabledRegions = TEST_UTIL.createMultiRegionsInMeta(
        TEST_UTIL.getConfiguration(), htdEnabled, SPLIT_KEYS);


    byte [] disabledTable = Bytes.toBytes("disabledTable");
    HTableDescriptor htdDisabled = new HTableDescriptor(disabledTable);
    htdDisabled.addFamily(new HColumnDescriptor(FAMILY));
    // Write the .tableinfo
    FSTableDescriptors.createTableDescriptor(filesystem, rootdir, htdDisabled);
    HRegionInfo hriDisabled = new HRegionInfo(htdDisabled.getName(), null, null);
    createRegion(hriDisabled, rootdir, conf, htdDisabled);

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   * @throws InterruptedException
   * @throws KeeperException
   */
  HTable setupTable(String tablename) throws Exception {
    HTableDescriptor desc = new HTableDescriptor(tablename);
    HColumnDescriptor hcd = new HColumnDescriptor(Bytes.toString(FAM));
    desc.addFamily(hcd); // If a table has no CF's it doesn't get checked
    TEST_UTIL.getHBaseAdmin().createTable(desc, SPLITS);
    tbl = new HTable(TEST_UTIL.getConfiguration(), tablename);


    List<Put> puts = new ArrayList<Put>();

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          .get(HConstants.HBASE_DIR)));


      byte[][] SPLIT_KEYS = new byte[][] { new byte[0], Bytes.toBytes("aaa"),
          Bytes.toBytes("bbb"), Bytes.toBytes("ccc"), Bytes.toBytes("ddd") };
      HTableDescriptor htdDisabled = new HTableDescriptor(Bytes.toBytes(table));
      htdDisabled.addFamily(new HColumnDescriptor(FAM));


      // Write the .tableinfo
      FSTableDescriptors
          .createTableDescriptor(filesystem, rootdir, htdDisabled);
      List<HRegionInfo> disabledRegions = TEST_UTIL.createMultiRegionsInMeta(

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  @Test
  public void testModifyTable() throws IOException {
    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    // Create a table with one family
    HTableDescriptor baseHtd = new HTableDescriptor(TABLE_NAME);
    baseHtd.addFamily(new HColumnDescriptor(FAMILY_0));
    admin.createTable(baseHtd);
    admin.disableTable(TABLE_NAME);
    try {
      // Verify the table descriptor
      verifyTableDescriptor(TABLE_NAME, FAMILY_0);


      // Modify the table adding another family and verify the descriptor
      HTableDescriptor modifiedHtd = new HTableDescriptor(TABLE_NAME);
      modifiedHtd.addFamily(new HColumnDescriptor(FAMILY_0));
      modifiedHtd.addFamily(new HColumnDescriptor(FAMILY_1));
      admin.modifyTable(TABLE_NAME, modifiedHtd);
      verifyTableDescriptor(TABLE_NAME, FAMILY_0, FAMILY_1);
    } finally {
      admin.deleteTable(TABLE_NAME);
    }

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