Examples of 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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Examples of AggregationClient

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