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.

    assertEquals(9.5, avg, 0);
  }


  @Test
  public void testAvgWithValidRangeWithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci,
        scan);
    assertEquals(104.5, avg, 0);
  }

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    assertEquals(104.5, avg, 0);
  }


  @Test
  public void testAvgWithValidRange2WithNoCQ() 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<Long, Long> ci = new LongColumnInterpreter();
    double avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(6 + 60, avg, 0);
  }

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    assertEquals(6 + 60, avg, 0);
  }


  @Test
  public void testAvgWithValidRangeWithNullCF() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Double avg = null;
    try {
      avg = aClient.avg(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, avg);// 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 testAvgWithInvalidRange() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[1]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Double avg = null;
    try {
      avg = aClient.avg(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, avg);// control should go to the catch block
  }

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


  @Test
  public void testAvgWithFilter() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    scan.setFilter(f);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Double avg = null;
    avg = aClient.avg(TEST_TABLE, ci, scan);
    assertEquals(Double.NaN, avg, 0);
  }

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  /**
   * @throws Throwable
   */
  @Test
  public void testStdWithValidRange() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY,TEST_QUALIFIER);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    double std = aClient.std(TEST_TABLE, ci,
        scan);
    assertEquals(5.766, std, 0.05d);
  }

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  /**
   * @throws Throwable
   */
  @Test
  public void testStdWithValidRange2() 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<Long, Long> ci = new LongColumnInterpreter();
    double std = aClient.std(TEST_TABLE, ci, scan);
    assertEquals(2.87, std, 0.05d);
  }

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    assertEquals(2.87, std, 0.05d);
  }


  @Test
  public void testStdWithValidRangeWithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    double std = aClient.std(TEST_TABLE, ci,
        scan);
    assertEquals(63.42, std, 0.05d);
  }

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    assertEquals(63.42, std, 0.05d);
  }


  @Test
  public void testStdWithValidRange2WithNoCQ() 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<Long, Long> ci = new LongColumnInterpreter();
    double std = aClient.std(TEST_TABLE, ci, scan);
    assertEquals(0, std, 0);
  }

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    assertEquals(0, std, 0);
  }


  @Test
  public void testStdWithValidRangeWithNullCF() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[17]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Double std = null;
    try {
      std = aClient.std(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
    }
    assertEquals(null, std);// CP will throw an IOException about the
    // null column family, and max will be set to 0
  }

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