Examples of org.apache.hadoop.zebra.io.TableScanner

org.apache.hadoop.zebra.io.TableScanner
Scanner interface allows application to scan a range of rows of a table. It is the caller's responsibility to close() the scanner after finishing using it. Scanner allows one to fetch the key without fetching the value to allow underlying implementation to instantiating tuple objects (Row) lazily.


    String projection3 = new String("f1,f2");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection3);
    List<RangeSplit> splits = reader.rangeSplit(1);
    TableScanner scanner = reader.getScanner(splits.get(0), true);
    scanner = reader.getScanner(splits.get(0), true);
    BytesWritable key = new BytesWritable();
    Tuple RowValue = TypesUtils.createTuple(scanner.getSchema());


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k11".getBytes()));
    scanner.getValue(RowValue);


    Assert.assertEquals(1, RowValue.get(0));
    Assert.assertEquals("hello1", RowValue.get(1));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, RowValue.get(0));
    Assert.assertEquals("hello2", RowValue.get(1));


    reader.close();

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  public void testDefaultProjection() throws IOException, ExecException,
      ParseException {
    System.out.println("testDefaultProjection");
    // test without beginKey/endKey
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    TableScanner scanner = reader.getScanner(null, false);


    defTest(reader, scanner);


    scanner.close();
    reader.close();
  }

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      ParseException {
    System.out.println("testNullProjection");
    // test without beginKey/endKey
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection(null);
    TableScanner scanner = reader.getScanner(null, false);


    defTest(reader, scanner);


    scanner.close();
    reader.close();
  }

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    // test without beginKey/endKey
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection("");


    Tuple row = TypesUtils.createTuple(reader.getSchema());
    TableScanner scanner = reader.getScanner(null, false);
    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    try {
      row.get(0);
      Assert.fail("Failed to catch out of boundary exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    // Assert.assertEquals("c2", row.get(0));


    scanner.close();
    reader.close();
  }

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    // test without beginKey/endKey
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection("X");


    Tuple row = TypesUtils.createTuple(1);
    TableScanner scanner = reader.getScanner(null, false);
    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    Assert.assertNull(row.get(0));
    try {
      row.get(1);
      Assert.fail("Failed to catch out of boundary exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    // Assert.assertEquals("c2", row.get(0));


    scanner.close();
    reader.close();
  }

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    // test without beginKey/endKey
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection("c");


    Tuple row = TypesUtils.createTuple(reader.getSchema());
    TableScanner scanner = reader.getScanner(null, false);
    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    Assert.assertEquals("c1", row.get(0));
    try {
      row.get(1);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    Assert.assertEquals("c2", row.get(0));


    scanner.close();
    reader.close();
  }

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    System.out.println("testOnePlusNonProjection");
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection(",f");


    Tuple row = TypesUtils.createTuple(reader.getSchema());
    TableScanner scanner = reader.getScanner(null, false);
    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    Assert.assertNull(row.get(0));
    Assert.assertEquals("f1", row.get(1));
    try {
      row.get(2);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    Assert.assertEquals("f2", row.get(1));


    scanner.close();
    reader.close();
  }

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    System.out.println("testTwoColumnsProjection");
    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    reader.setProjection("f,a");


    Tuple row = TypesUtils.createTuple(reader.getSchema());
    TableScanner scanner = reader.getScanner(null, false);
    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    Assert.assertEquals("f1", row.get(0));
    Assert.assertEquals("a1", row.get(1));
    try {
      row.get(2);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    Assert.assertEquals("f2", row.get(0));
    Assert.assertEquals("a2", row.get(1));


    scanner.close();
    reader.close();
  }

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    String projection = new String("m5");
    BasicTable.Reader reader = new BasicTable.Reader(pathTable, conf);
    reader.setProjection(projection);


    List<RangeSplit> splits = reader.rangeSplit(1);
    TableScanner scanner = reader.getScanner(splits.get(0), true);
    BytesWritable key = new BytesWritable();
    Tuple RowValue = TypesUtils.createTuple(scanner.getSchema());


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k11".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(false, RowValue.isNull());
    Assert.assertEquals(null, RowValue.get(0));
    Assert.assertEquals(1, RowValue.size());


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(false, RowValue.isNull());
    Assert.assertEquals(null, RowValue.get(0));
    Assert.assertEquals(1, RowValue.size());
    reader.close();
  }

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    // Starting read , simple projection 0, not record of record level. PASS
    String projection0 = new String("r1.f1, r1.f2");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection0);
    List<RangeSplit> splits = reader.rangeSplit(1);
    TableScanner scanner = reader.getScanner(splits.get(0), true);
    BytesWritable key = new BytesWritable();
    Tuple RowValue = TypesUtils.createTuple(scanner.getSchema());


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k11".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(1, RowValue.get(0));
    Assert.assertEquals(1001L, RowValue.get(1));


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, RowValue.get(0));
    Assert.assertEquals(1002L, RowValue.get(1));


    reader.close();

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org.apache.hadoop.zebra.io.TestBasicTableMapSplits

org.apache.hadoop.zebra.io.TestBasicTableProjections

org.apache.hadoop.zebra.io.TestBasicTableSplits

org.apache.hadoop.zebra.io.TestCollection

org.apache.hadoop.zebra.io.TestColumnGroup

org.apache.hadoop.zebra.io.TestColumnGroupName1

org.apache.hadoop.zebra.io.TestColumnGroupProjections

org.apache.hadoop.zebra.io.TestColumnGroupReaders

org.apache.hadoop.zebra.io.TestColumnGroupSplits

org.apache.hadoop.zebra.io.TestColumnGroupWithWorkPath

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