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(5, 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<Long, Long> ci = new LongColumnInterpreter();
    long min = aClient.min(TEST_TABLE, ci,
        scan);
    assertEquals(0, min);
  }

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    assertEquals(0, 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<Long, Long> ci = new LongColumnInterpreter();
    long min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(6, min);
  }

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    assertEquals(6, min);
  }


  @Test
  public void testMinWithValidRangeWithNullCF() {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Long 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);
    Long min = null;
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[4]);
    scan.setStopRow(ROWS[2]);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    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<Long, Long> ci = new LongColumnInterpreter();
    Long 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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    assertEquals(null, min);// control should go to the catch block
  }


  @Test
  public void testMinWithFilter() 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();
    Long min = null;
    min = aClient.min(TEST_TABLE, ci, scan);
    assertEquals(null, min);
  }

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  /**
   * @throws Throwable
   */
  @Test
  public void testSumWithValidRange() 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 sum = aClient.sum(TEST_TABLE, ci,
        scan);
    assertEquals(190, sum);
  }

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  /**
   * @throws Throwable
   */
  @Test
  public void testSumWithValidRange2() 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();
    long sum = aClient.sum(TEST_TABLE, ci, scan);
    assertEquals(95, sum);
  }

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    assertEquals(95, sum);
  }


  @Test
  public void testSumWithValidRangeWithNoCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    long sum = aClient.sum(TEST_TABLE, ci,
        scan);
    assertEquals(190 + 1900, sum);
  }

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    assertEquals(190 + 1900, sum);
  }


  @Test
  public void testSumWithValidRange2WithNoCQ() 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();
    long sum = aClient.sum(TEST_TABLE, ci, scan);
    assertEquals(6 + 60, sum);
  }

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