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 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);
    System.out.println("map of map: " + RowValue.toString());
    // map of map: ([b#B],[z#,x#{m311=311, m321=321, m331=331}])
    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): " + RowValue.get(1).toString());
    // rowValue.get)1): {z=null, x={m311=311, m321=321, m331=331}}


    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

    String projection = new String("m5");
    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(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();
  }

View Full Code Here

  public void testRead4() throws IOException, ParseException {
    String projection = new String("m1#{nonexist}");
    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("read1 : " + RowValue.toString());
    Assert.assertEquals("{}", RowValue.get(0).toString());


    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    System.out.println(RowValue.get(0).toString());
    Assert.assertEquals("{}", RowValue.get(0).toString());


    reader.close();
  }

View Full Code Here

    // Starting read
    String projection = new String("group");
    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("hello world 1", RowValue.get(0));


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




    reader.close();

View Full Code Here

    ParseException {
    String projection = new String("s6,s5,s4,s3,s2,s1");
    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(true, RowValue.get(5));
    Assert.assertEquals(1, RowValue.get(4));
    Assert.assertEquals(1001L, RowValue.get(3));
    Assert.assertEquals(1.1, RowValue.get(2));
    Assert.assertEquals("hello world 1", RowValue.get(1));
    Assert.assertEquals("hello byte 1", RowValue.get(0).toString());
    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
    scanner.getValue(RowValue);
    Assert.assertEquals(false, RowValue.get(5));
    Assert.assertEquals(2, RowValue.get(4));
    Assert.assertEquals(1002L, RowValue.get(3));
    Assert.assertEquals(3.1, RowValue.get(2));
    Assert.assertEquals("hello world 2", RowValue.get(1));

View Full Code Here

    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();
  }

View Full Code Here


    List<RangeSplit> splits = reader.rangeSplit(1);
    reader.close();
    reader = new BasicTable.Reader(path, conf);
    reader.setProjection(projection);
    TableScanner scanner = reader.getScanner(splits.get(0), true);
    BytesWritable key = new BytesWritable();
    Tuple value = TypesUtils.createTuple(scanner.getSchema());


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


    Tuple recordTuple = (Tuple) value.get(2);
    Assert.assertEquals(1, recordTuple.get(0));
    Assert.assertEquals(1001L, recordTuple.get(1));
    Assert.assertEquals(true, value.get(0));

View Full Code Here

    ColumnGroup.Reader reader = new ColumnGroup.Reader(path, conf);
    if (projection != null) {
      reader.setProjection(projection);
    }
    int totalRows = 0;
    TableScanner scanner = reader.getScanner(null, true);
    for (; !scanner.atEnd(); scanner.advance()) {
      ++totalRows;
    }
    scanner.close();
    return totalRows;
  }

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

View Full Code Here

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org.apache.hadoop.zebra.io.TestBasicTableMapSplits

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org.apache.hadoop.zebra.io.TestCollection

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org.apache.hadoop.zebra.io.TestColumnGroupSplits

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