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

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

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

org.apache.hadoop.hbase.client.coprocessor.LongColumnInterpreter
a concrete column interpreter implementation. The cell value is a Long value and its promoted data type is also a Long value. For computing aggregation function, this class is used to find the datatype of the cell value. Client is supposed to instantiate it and passed along as a parameter. See TestAggregateProtocol methods for its sample usage. Its methods handle null arguments gracefully.

    AggregationClient aClient = new AggregationClient(conf);
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    scan.setFilter(f);
    final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
    Double std = null;
    std = aClient.std(TEST_TABLE, ci, scan);
    assertEquals(Double.NaN, std, 0);
  }

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  public void testMedianWithValidRange() throws Throwable {
    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 median = aClient.median(TEST_TABLE, ci,
        scan);
    assertEquals(8L, median);
  }

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    Scan scan = new Scan();
    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[2]);
    scan.setStopRow(ROWS[14]);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long rowCount = aClient.rowCount(TEST_TABLE, ci, scan);
    assertEquals(12, rowCount);
  }

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  public void testRowCountAllTable() throws Throwable {
    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 rowCount = aClient.rowCount(TEST_TABLE, ci,
        scan);
    assertEquals(ROWSIZE, rowCount);
  }

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    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[2]);


    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long rowCount = -1;
    try {
      rowCount = aClient.rowCount(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
      myLog.error("Exception thrown in the invalidRange method"

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    scan.addColumn(TEST_FAMILY, TEST_QUALIFIER);
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[5]);


    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long rowCount = -1;
    try {
      rowCount = aClient.rowCount(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
      rowCount = 0;

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    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.setStartRow(ROWS[5]);
    scan.setStopRow(ROWS[15]);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long rowCount = -1;
    try {
      rowCount = aClient.rowCount(TEST_TABLE, ci, scan);
    } catch (Throwable e) {
       rowCount = 0;

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  public void testRowCountWithNullCQ() throws Throwable {
    AggregationClient aClient = new AggregationClient(conf);
    Scan scan = new Scan();
    scan.addFamily(TEST_FAMILY);
    final ColumnInterpreter<Long, Long, EmptyMsg, LongMsg, LongMsg> ci =
        new LongColumnInterpreter();
    long rowCount = aClient.rowCount(TEST_TABLE, ci,
        scan);
    assertEquals(20, rowCount);
  }

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  public void testRowCountWithPrefixFilter() throws Throwable {
    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();
    Filter f = new PrefixFilter(Bytes.toBytes("foo:bar"));
    scan.setFilter(f);
    long rowCount = aClient.rowCount(TEST_TABLE, ci,
        scan);
    assertEquals(0, rowCount);

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  public void testMaxWithValidRange() throws Throwable {
    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);
  }

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