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.

      boolean res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val1), put, lockId, true);
      assertEquals(true, res);


      //checkAndDelete with correct value
      Delete delete = new Delete(row1);
      delete.deleteColumn(fam1, qf1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val1), put, lockId, true);
      assertEquals(true, res);
    } finally {
      HRegion.closeHRegion(this.region);

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      put.add(fam2, qf3, val1);
      put.add(fam1, qf3, val1);
      region.put(put);


      //Multi-column delete
      Delete delete = new Delete(row1);
      delete.deleteColumn(fam1, qf1);
      delete.deleteColumn(fam2, qf1);
      delete.deleteColumn(fam1, qf3);
      boolean res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val2), delete, lockId, true);
      assertEquals(true, res);


      Get get = new Get(row1);
      get.addColumn(fam1, qf1);
      get.addColumn(fam1, qf3);
      get.addColumn(fam2, qf2);
      Result r = region.get(get, null);
      assertEquals(2, r.size());
      assertEquals(val1, r.getValue(fam1, qf1));
      assertEquals(val2, r.getValue(fam2, qf2));


      //Family delete
      delete = new Delete(row1);
      delete.deleteFamily(fam2);
      res = region.checkAndMutate(row1, fam2, qf1, CompareOp.EQUAL,
          new BinaryComparator(emptyVal), delete, lockId, true);
      assertEquals(true, res);


      get = new Get(row1);
      r = region.get(get, null);
      assertEquals(1, r.size());
      assertEquals(val1, r.getValue(fam1, qf1));


      //Row delete
      delete = new Delete(row1);
      res = region.checkAndMutate(row1, fam1, qf1, CompareOp.EQUAL,
          new BinaryComparator(val1), delete, lockId, true);
      assertEquals(true, res);
      get = new Get(row1);
      r = region.get(get, null);

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    this.region = initHRegion(tableName, method, conf, fam1);
    try {
      region.put(put);


      // We do support deleting more than 1 'latest' version
      Delete delete = new Delete(row1);
      delete.deleteColumn(fam1, qual);
      delete.deleteColumn(fam1, qual);
      region.delete(delete, null, false);


      Get get = new Get(row1);
      get.addFamily(fam1);
      Result r = region.get(get, null);

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      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, null, true);


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


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


      get = new Get(row).addColumn(fam, splitB);
      result = region.get(get, null);
      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, null);
      assertEquals(3, result.size());


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


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

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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, null, true);


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


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


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

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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, null, true);


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

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   * @param writeToWAL
   * @throws IOException
   */
  void delete(Map<byte[], List<KeyValue>> familyMap, UUID clusterId,
      boolean writeToWAL) throws IOException {
    Delete delete = new Delete();
    delete.setFamilyMap(familyMap);
    delete.setClusterId(clusterId);
    delete.setWriteToWAL(writeToWAL);
    internalDelete(delete, clusterId, writeToWAL);
  }

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    }
  }


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

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    delete.deleteColumns(fam1, qual1);
    doTestDelete_AndPostInsert(delete);
  }


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

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          // originating cluster. A slave cluster receives the result as a Put
          // or Delete
          if (isPut) {
            internalPut(((Put) w), HConstants.DEFAULT_CLUSTER_ID, writeToWAL);
          } else {
            Delete d = (Delete)w;
            prepareDelete(d);
            internalDelete(d, HConstants.DEFAULT_CLUSTER_ID, writeToWAL);
          }
          return true;
        }

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