Examples of org.apache.hadoop.hbase.client.Delete

org.apache.hadoop.hbase.client.Delete
Used to perform Delete operations on a single row.
To delete an entire row, instantiate a Delete object with the row to delete. To further define the scope of what to delete, perform additional methods as outlined below.
To delete specific families, execute {@link #deleteFamily(byte[]) deleteFamily}for each family to delete.
To delete multiple versions of specific columns, execute {@link #deleteColumns(byte[],byte[]) deleteColumns}for each column to delete.
To delete specific versions of specific columns, execute {@link #deleteColumn(byte[],byte[],long) deleteColumn}for each column version to delete.
Specifying timestamps, deleteFamily and deleteColumns will delete all versions with a timestamp less than or equal to that passed. If no timestamp is specified, an entry is added with a timestamp of 'now' where 'now' is the servers's System.currentTimeMillis(). Specifying a timestamp to the deleteColumn method will delete versions only with a timestamp equal to that specified. If no timestamp is passed to deleteColumn, internally, it figures the most recent cell's timestamp and adds a delete at that timestamp; i.e. it deletes the most recently added cell.
The timestamp passed to the constructor is used ONLY for delete of rows. For anything less -- a deleteColumn, deleteColumns or deleteFamily -- then you need to use the method overrides that take a timestamp. The constructor timestamp is not referenced.

      put = new Put(row);
      put.add(fam, serverinfo, Bytes.toBytes("ip_address"));
      region.put(put);


      // ok now delete a split:
      Delete delete = new Delete(row);
      delete.deleteColumns(fam, splitA);
      region.delete(delete);


      // assert some things:
      Get get = new Get(row).addColumn(fam, serverinfo);
      Result result = region.get(get);
      assertEquals(1, result.size());


      get = new Get(row).addColumn(fam, splitA);
      result = region.get(get);
      assertEquals(0, result.size());


      get = new Get(row).addColumn(fam, splitB);
      result = region.get(get);
      assertEquals(1, result.size());


      // Assert that after a delete, I can put.
      put = new Put(row);
      put.add(fam, splitA, Bytes.toBytes("reference_A"));
      region.put(put);
      get = new Get(row);
      result = region.get(get);
      assertEquals(3, result.size());


      // Now delete all... then test I can add stuff back
      delete = new Delete(row);
      region.delete(delete);
      assertEquals(0, region.get(get).size());


      region.put(new Put(row).add(fam, splitA, Bytes.toBytes("reference_A")));
      result = region.get(get);

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      Put put = new Put(row);
      put.add(fam, serverinfo, HConstants.LATEST_TIMESTAMP - 5, Bytes.toBytes("value"));
      region.put(put);


      // now delete something in the present
      Delete delete = new Delete(row);
      region.delete(delete);


      // make sure we still see our data
      Get get = new Get(row).addColumn(fam, serverinfo);
      Result result = region.get(get);
      assertEquals(1, result.size());


      // delete the future row
      delete = new Delete(row, HConstants.LATEST_TIMESTAMP - 3);
      region.delete(delete);


      // make sure it is gone
      get = new Get(row).addColumn(fam, serverinfo);
      result = region.get(get);

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      byte[] rowA = Bytes.toBytes("rowA");
      byte[] rowB = Bytes.toBytes("rowB");


      byte[] value = Bytes.toBytes("value");


      Delete delete = new Delete(rowA);
      delete.deleteFamily(fam1);


      region.delete(delete);


      // now create data.
      Put put = new Put(rowA);

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    }
  }


  @Test
  public void testDeleteColumns_PostInsert() throws IOException, InterruptedException {
    Delete delete = new Delete(row);
    delete.deleteColumns(fam1, qual1);
    doTestDelete_AndPostInsert(delete);
  }

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    doTestDelete_AndPostInsert(delete);
  }


  @Test
  public void testDeleteFamily_PostInsert() throws IOException, InterruptedException {
    Delete delete = new Delete(row);
    delete.deleteFamily(fam1);
    doTestDelete_AndPostInsert(delete);
  }

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      put.add(family, qual1, 1L, Bytes.toBytes(1L));
      region.put(put);


      region.flushcache();


      Delete delete = new Delete(Bytes.toBytes(1L), 1L);
      region.delete(delete);


      put = new Put(Bytes.toBytes(2L));
      put.add(family, qual1, 2L, Bytes.toBytes(2L));
      region.put(put);

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      Put put = new Put(row);
      put.add(familyName, col, 1, Bytes.toBytes("SomeRandomValue"));
      region.put(put);
      region.flushcache();


      Delete del = new Delete(row);
      region.delete(del);
      region.flushcache();


      // Get remaining rows (should have none)
      Get get = new Get(row);

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    List<Delete> list = new ArrayList<Delete>();
    // delete half of the rows
    for (int i = 0; i < NB_ROWS_IN_BATCH / 2; i++) {
      String rowKey = "row" + i;
      Delete del = new Delete(rowKey.getBytes());
      list.add(del);
    }
    ht1Source.delete(list);


    for (int i = 0; i < NB_ROWS_IN_BATCH; i++) {
      String rowKey = "row" + i;
      Delete del = new Delete(rowKey.getBytes());
      list.add(del);
    }
    ht2Source.delete(list);


    int rowCount_ht1Source = utility1.countRows(ht1Source);

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   }
   
   private static Delete mkDel(String word) {
      log.debug(String.format("Creating Delete for %s", word));


      Delete d = new Delete(Bytes.toBytes(word));
      return d;
    }

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   }
   
   public void deleteUser(String word) throws IOException {
     HTableInterface words = pool.getTable(TABLE_NAME);


       Delete d = mkDel(word);
       words.delete(d);


       words.close();
   }

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