Examples of org.apache.hadoop.hbase.client.coprocessor.AggregationClient

Package org.apache.hadoop.hbase.client.coprocessor

Examples of org.apache.hadoop.hbase.client.coprocessor.AggregationClient

org.apache.hadoop.hbase.client.coprocessor.AggregationClient
This client class is for invoking the aggregate functions deployed on the Region Server side via the AggregateProtocol. This class will implement the supporting functionality for summing/processing the individual results obtained from the AggregateProtocol for each region.
This will serve as the client side handler for invoking the aggregate functions.
- start row < end row is an essential condition (if they are not {@link HConstants#EMPTY_BYTE_ARRAY})
- Column family can't be null. In case where multiple families are provided, an IOException will be thrown. An optional column qualifier can also be defined.
- For methods to find maximum, minimum, sum, rowcount, it returns the parameter type. For average and std, it returns a double value. For row count, it returns a long value.

  /**
   * @throws Throwable
   */
  @Test
  public void testMinWithValidRange2() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    BigDecimal min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(new BigDecimal("5.00"), min);
  }

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    assertEquals(new BigDecimal("5.00"), min);
  }


  @Test
  public void testMinWithValidRangeWithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(HConstants.EMPTY_START_ROW);
    scan.setStopRow(HConstants.EMPTY_END_ROW);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    BigDecimal min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(new BigDecimal("0.00"), min);
  }

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    assertEquals(new BigDecimal("0.00"), min);
  }


  @Test
  public void testMinWithValidRange2WithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[7]);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    BigDecimal min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(new BigDecimal("0.60"), min);
  }

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    assertEquals(new BigDecimal("0.60"), min);
  }


  @Test
  public void testMinWithValidRangeWithNullCF() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    BigDecimal min = null;
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, min);// CP will throw an IOException about the
    // null column family, and max will be set to 0
  }

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    // null column family, and max will be set to 0
  }


  @Test
  public void testMinWithInvalidRange() {
    AggregationClient aClient = new AggregationClient(conf);
    BigDecimal min = null;
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[4]);
    scan.setStopRow(ROWS[2]);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, min);// control should go to the catch block
  }

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    assertEquals(null, min);// control should go to the catch block
  }


  @Test
  public void testMinWithInvalidRange2() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[6]);
    final ColumnInterpreter<BigDecimal, BigDecimal> ci = new BigDecimalColumnInterpreter();
    BigDecimal min = null;
    try {
      min = aClient.min(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, min);// control should go to the catch block
  }

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        //scan.addColumn(b("CF"), b("AGE"));


        init();
        createTable();
        initHTable();
        ac = new AggregationClient(conf);


        ResultSet rs = stmt.executeQuery("select * from " + tableName + " where _rowkey_='RK" + startKey + "'");
        if (!rs.next())
            testHBaseBatch();

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  /**
   * @throws Throwable
   */
  @Test
  public void testMedianWithValidRange() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long median = aClient.median(TEST_TABLE, ci,
        scan);
    assertEquals(8L, median);
  }

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   * be the most common use case.
   * @throws Throwable
   */
  @Test
  public void testRowCountWithValidRange() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[2]);
    scan.setStopRow(ROWS[14]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long rowCount = aClient.rowCount(TEST_TABLE, ci, scan);
    assertEquals(12, rowCount);
  }

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   * be null.
   * @throws Throwable
   */
  @Test
  public void testRowCountAllTable() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long rowCount = aClient.rowCount(TEST_TABLE, ci,
        scan);
    assertEquals(ROWSIZE, rowCount);
  }

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