Examples of org.apache.hadoop.hbase.client.coprocessor.AggregationClient.max()

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

Class org.apache.hadoop.hbase.client.coprocessor.AggregationClient

Examples of org.apache.hadoop.hbase.client.coprocessor.AggregationClient.max()

org.apache.hadoop.hbase.client.coprocessor.AggregationClient.max()
It gives the maximum value of a column for a given column family for the given range. In case qualifier is null, a max of all values for the given family is returned. @param tableName @param ci @param scan @return max val @throws Throwable The caller is supposed to handle the exception as they are thrown & propagated to it.

    scan.setStopRow(ROWS[4]);
    try {
      AggregationClient aClient = new AggregationClient(conf);
      final ColumnInterpreter<BigDecimal, BigDecimal, EmptyMsg, BigDecimalMsg, BigDecimalMsg> ci =
        new BigDecimalColumnInterpreter();
      max = aClient.max(TEST_TABLE, ci, scan);
    } catch (Exception e) {
      max = BigDecimal.ZERO;
    }
    assertEquals(BigDecimal.ZERO, max);// control should go to the catch block
  }

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    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    scan.setFilter(f);
    final ColumnInterpreter<BigDecimal, BigDecimal, EmptyMsg, BigDecimalMsg, BigDecimalMsg> ci =
      new BigDecimalColumnInterpreter();
    max = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(null, max);
  }


  /**
   * **************************Test cases for Minimum ***********************

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long maximum = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(19, maximum);
  }


  /**
   * @throws Throwable

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    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long max = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(14, max);
  }


  @Test
  public void testMaxWithValidRangeWithNoCQ() throws Throwable {

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long maximum = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(190, maximum);
  }


  @Test
  public void testMaxWithValidRange2WithNoCQ() throws Throwable {

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    scan.addFamily(TEST_FAMILY);
    scan.setStartRow(ROWS[6]);
    scan.setStopRow(ROWS[7]);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long max = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(60, max);
  }


  @Test
  public void testMaxWithValidRangeWithNullCF() {

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    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    Scan scan = new Scan();
    Long max = null;
    try {
      max = aClient.max(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
      max = null;
    }
    assertEquals(null, max);// CP will throw an IOException about the
    // null column family, and max will be set to 0

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    scan.setStartRow(ROWS[4]);
    scan.setStopRow(ROWS[2]);
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    long max = Long.MIN_VALUE;
    try {
      max = aClient.max(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
      max = 0;
    }
    assertEquals(0, max);// control should go to the catch block
  }

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    scan.setStopRow(ROWS[4]);
    try {
      AggregationClient aClient = new AggregationClient(conf);
      final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
          new LongColumnInterpreter();
      max = aClient.max(TEST_TABLE, ci, scan);
    } catch (Exception e) {
      max = 0;
    }
    assertEquals(0, max);// control should go to the catch block
  }

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    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    scan.setFilter(f);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    max = aClient.max(TEST_TABLE, ci, scan);
    assertEquals(null, max);
  }


  /**
   * **************************Test cases for Minimum ***********************

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