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 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));
    Long expected = 1001L;
    Assert.assertEquals(expected, RowValue.get(1));


    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, RowValue.get(1));


    reader.close();

View Full Code Here

  public void testReadRecordOfMap1() throws IOException, ParseException {
    String projection1 = new String("r2.r3.f4#{a|b}, r2.r3.f3");
    BasicTable.Reader reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection1);
    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, ((Map) (RowValue.get(0))).get("a"));
    Assert.assertEquals(2, ((Map) RowValue.get(0)).get("b"));
    Assert.assertEquals(1.3F, ((Map<String, Float>) RowValue.get(1)).get("x"));


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("a"));
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("b"));
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("x"));
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("y"));
    Assert.assertEquals(null, ((Map) RowValue.get(0)).get("c"));

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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(1.3F, ((Map<String, Float>) RowValue.get(1)).get("x"));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, RowValue.get(0));
    Assert.assertEquals(2.3F, ((Map<String, Float>) RowValue.get(1)).get("y"));
    reader.close();
  }

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  public void testReadRecordOfRecord3() throws IOException, ParseException {
    String projection3 = new String("r1, r2, r2.r3.f3#{y|x}");
    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));
    Assert.assertEquals(1.3F, ((Map<String, Float>) RowValue.get(2)).get("x"));
    // Assert.assertEquals(null, ((Map<String,
    // Float>)RowValue.get(2)).get("x"));
    Assert.assertEquals(null, ((Map<String, Float>) RowValue.get(2)).get("y"));
    Assert.assertEquals(null, ((Map<String, Float>) 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"));


    scanner.advance();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(2, ((Tuple) RowValue.get(0)).get(0));
    Assert.assertEquals(null, ((Map<String, Long>) RowValue.get(2)).get("x"));
    // Assert.assertEquals(null, ((Map<String,
    // Float>)RowValue.get(2)).get("y"));
    Assert.assertEquals(2.3F, ((Map<String, Long>) RowValue.get(2)).get("y"));

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;

View Full Code Here

  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();


  }

View Full Code Here

    String projection = new String("a,b,c,d,e,f,r1,m1");


    BasicTable.Reader reader = new BasicTable.Reader(pathTable1, 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.getValue(RowValue);
    System.out.println("rowvalue size:"+RowValue.size());
    System.out.println("read a : " + RowValue.get(0).toString());
    System.out.println("read string: " + RowValue.get(1).toString());


    scanner.advance();
    scanner.getValue(RowValue);
    System.out.println("read float in 2nd row: "+ RowValue.get(1).toString());
    System.out.println("done insert table");


    reader.close();

View Full Code Here

    String projection = new String("a,b,c,d,e,f,r1,m1");


    BasicTable.Reader reader = new BasicTable.Reader(pathTable2, 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.getValue(RowValue);
    System.out.println("rowvalue size:"+RowValue.size());
    System.out.println("read a : " + RowValue.get(7).toString());
    System.out.println("read string: " + RowValue.get(6).toString());


    scanner.advance();
    scanner.getValue(RowValue);
    System.out.println("read float in 2nd row: "+ RowValue.get(6).toString());
    System.out.println("done insert table");




    reader.close();

View Full Code Here

  public void testRead1() throws IOException, ParseException {
    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);
    System.out.println("read 1:" + RowValue.toString());
    // read 1:(1,1001L)
    Assert.assertEquals(1, RowValue.get(0));


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


  }

View Full Code Here

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org.apache.hadoop.zebra.io.TestBasicTableMapSplits

org.apache.hadoop.zebra.io.TestBasicTableProjections

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