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.

  public void testRead2() throws IOException, ParseException {
    String projection = new String("c2");
    BasicTable.Reader reader = new BasicTable.Reader(path, 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);
    System.out.println("test read 2:row: " + RowValue.toString());
    // test read 2:row:
    // ({((1,record1_string1),hello1),((2,record2_string1),hello2)})
    Iterator<Tuple> it = ((DataBag) RowValue.get(0)).iterator();
    int list = 0;
    while (it.hasNext()) {
      Tuple cur = it.next();
      System.out.println(cur.get(0)); // (1,record1_string1)
      list++;
      if (list == 1) {
        Assert.assertEquals(1, ((Tuple) cur.get(0)).get(0));
        Assert.assertEquals("record1_string1", ((Tuple) cur.get(0)).get(1));
        Assert.assertEquals("hello1", cur.get(1));


      }
      if (list == 2) {
        Assert.assertEquals(2, ((Tuple) cur.get(0)).get(0));
        Assert.assertEquals("record2_string1", ((Tuple) cur.get(0)).get(1));
        Assert.assertEquals("hello2", cur.get(1));


      }
    }
    scanner.advance();
    scanner.getValue(RowValue);
    Iterator<Tuple> it2 = ((DataBag) RowValue.get(0)).iterator();
    int list2 = 0;
    while (it2.hasNext()) {
      Tuple cur = it2.next();
      System.out.println(cur.get(0));

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  public void testReadRecordOfRecord2() throws IOException, ParseException {
    String projection2 = new String("r1.f1, r2.r3.f3");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection2);
    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(1.3, 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(2.3, RowValue.get(1));
    reader.close();
  }

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  public void testReadRecordOfRecord3() throws IOException, ParseException {
    String projection3 = new String("r1, r2, r1.f2#{x|z}");
    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, ((Tuple) RowValue.get(0)).get(0));
    Long expected = 1001L;
    Assert.assertEquals(expected, ((Map<String, Long>) RowValue.get(2))
        .get("x"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("y"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("z"));
    Tuple r2 = (Tuple) RowValue.get(1);
    Tuple r3 = (Tuple) r2.get(0);
    Map<String, Integer> f4 = (Map<String, Integer>) r3.get(1);
    Integer tmp = 1;
    Assert.assertEquals(tmp, f4.get("a"));
    tmp = 2;
    Assert.assertEquals(tmp, f4.get("b"));
    tmp = 3;
    Assert.assertEquals(tmp, f4.get("c"));
    Assert.assertEquals(1.3, ((Tuple) ((Tuple) RowValue.get(1)).get(0)).get(0));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, ((Tuple) RowValue.get(0)).get(0));
    expected = 1002L;
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("x"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("y"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("z"));

View Full Code Here

  public void testReadRecordOfRecord4() throws IOException, ParseException {
    String projection3 = new String("r2.r3.f4");
    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);


    Map<String, Integer> f4 = (Map<String, Integer>) RowValue.get(0);
    Integer tmp = 1;
    Assert.assertEquals(tmp, f4.get("a"));
    tmp = 2;
    Assert.assertEquals(tmp, f4.get("b"));
    tmp = 3;
    Assert.assertEquals(tmp, f4.get("c"));
    Assert.assertEquals(null, f4.get("x"));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);


    f4 = (Map<String, Integer>) RowValue.get(0);
    tmp = 11;
    Assert.assertEquals(tmp, f4.get("x"));
    tmp = 12;

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  public void testReadNegative1() throws IOException, ParseException {
    String projection4 = new String("r3");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection4);
    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(null, RowValue.get(0));
    reader.close();


  }

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  public void testReadSimpleMap() throws IOException, ParseException {
    String projection = new String("m1#{a}");
    BasicTable.Reader reader = new BasicTable.Reader(path, 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("{a=A}", RowValue.get(0).toString());


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals("{a=A2}", RowValue.get(0).toString());


    reader.close();
  }

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  public void testReadMapOfMap() throws IOException, ParseException {
    String projection2 = new String("m1#{b}, m2#{x|z}");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection2);
    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("B", ((Map) RowValue.get(0)).get("b"));
    Assert.assertEquals(321, ((Map) ((Map) RowValue.get(1)).get("x"))
        .get("m321"));
    Assert.assertEquals(311, ((Map) ((Map) RowValue.get(1)).get("x"))
        .get("m311"));
    Assert.assertEquals(331, ((Map) ((Map) RowValue.get(1)).get("x"))
        .get("m331"));
    Assert.assertEquals(null, ((Map) ((Map) RowValue.get(1)).get("x"))
        .get("m341"));
    Assert.assertEquals(null, ((Map) ((Map) RowValue.get(1)).get("z")));
    Assert.assertEquals(null, ((Map) ((Map) RowValue.get(0)).get("a")));
    Assert.assertEquals(null, ((Map) ((Map) RowValue.get(0)).get("c")));


    System.out.println(RowValue.get(1).toString());


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("b"));
    Assert.assertEquals(null, ((Map) ((Map) RowValue.get(1)).get("x")));
    Assert.assertEquals(323, ((Map) ((Map) RowValue.get(1)).get("z"))
        .get("m323"));
    Assert.assertEquals(322, ((Map) ((Map) RowValue.get(1)).get("z"))

View Full Code Here

  public void testReadMapOfRecord1() throws IOException, ParseException {
    String projection2 = new String("m1#{b}, m4#{a4|c4}");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection2);
    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("B", ((Map) RowValue.get(0)).get("b"));
    System.out.println(RowValue.get(1).toString());


    Assert.assertEquals(11, ((Tuple) ((Map) ((Map) RowValue.get(1)).get("a4"))
        .get("ma4")).get(0));
    Assert.assertEquals("record row 1.1", ((Tuple) ((Map) ((Map) RowValue
        .get(1)).get("a4")).get("ma4")).get(1));
    Assert.assertEquals(12, ((Tuple) ((Map) ((Map) RowValue.get(1)).get("a4"))
        .get("mb4")).get(0));
    Assert.assertEquals("record row 1.2", ((Tuple) ((Map) ((Map) RowValue
        .get(1)).get("a4")).get("mb4")).get(1));
    Assert.assertEquals(13, ((Tuple) ((Map) ((Map) RowValue.get(1)).get("a4"))
        .get("mc4")).get(0));
    Assert.assertEquals("record row 1.3", ((Tuple) ((Map) ((Map) RowValue
        .get(1)).get("a4")).get("mc4")).get(1));


    Assert.assertEquals(13, ((Tuple) ((Map) ((Map) RowValue.get(1)).get("c4"))
        .get("ma43")).get(0));
    Assert.assertEquals("record row 1.3", ((Tuple) ((Map) ((Map) RowValue
        .get(1)).get("c4")).get("ma43")).get(1));


    Assert.assertEquals(null, (((Map) ((Map) RowValue.get(1)).get("c4"))
        .get("mc4")));
    Assert.assertEquals(null, (((Map) ((Map) RowValue.get(1)).get("c4"))
        .get("mb4")));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    System.out.println(RowValue.get(1).toString());
    Assert.assertEquals(21, ((Tuple) ((Map) ((Map) RowValue.get(1)).get("a4"))
        .get("ma4")).get(0));
    Assert.assertEquals("record row 2.1", ((Tuple) ((Map) ((Map) RowValue
        .get(1)).get("a4")).get("ma4")).get(1));

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  public void testReadSimpleStitch() throws IOException, ParseException {
    String projection2 = new String("s5, s1");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection2);
    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("hello world 1", RowValue.get(0));
    Assert.assertEquals(true, RowValue.get(1));


    scanner.advance();


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


    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));
    Long expected = 1001L;
    Assert.assertEquals(expected, ((Map<String, Long>) RowValue.get(1))
        .get("x"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(1)).get("y"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(1)).get("a"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(1)).get("z"));


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, RowValue.get(0));
    expected = 1002L;
    Assert.assertEquals(expected, ((Map<String, Long>) RowValue.get(1))
        .get("y"));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(1)).get("x"));

View Full Code Here

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