Examples of org.apache.pig.data.DataBag

org.apache.pig.data.DataBag
A collection of Tuples. A DataBag may or may not fit into memory. DataBag extends spillable, which means that it registers with a memory manager. By default, it attempts to keep all of its contents in memory. If it is asked by the memory manager to spill to disk (by a call to spill()), it takes whatever it has in memory, opens a spill file, and writes the contents out. This may happen multiple times. The bag tracks all of the files it's spilled to. DataBag provides an Iterator interface, that allows callers to read through the contents. The iterators are aware of the data spilling. They have to be able to handle reading from files, as well as the fact that data they were reading from memory may have been spilled to disk underneath them. The DataBag interface assumes that all data is written before any is read. That is, a DataBag cannot be used as a queue. If data is written after data is read, the results are undefined. This condition is not checked on each add or read, for reasons of speed. Caveat emptor. Since spills are asynchronous (the memory manager requesting a spill runs in a separate thread), all operations dealing with the mContents Collection (which is the collection of tuples contained in the bag) have to be synchronized. This means that reading from a DataBag is currently serialized. This is ok for the moment because pig execution is currently single threaded. A ReadWriteLock was experimented with, but it was found to be about 10x slower than using the synchronize keyword. If pig changes its execution model to be multithreaded, we may need to return to this issue, as synchronizing reads will most likely defeat the purpose of multi-threading execution. DataBag come in several types, default, sorted, and distinct. The type must be chosen up front, there is no way to convert a bag on the fly.

    m2.put("x", m3);
    m2.put("y", m4);
    tuple.set(9, m2);


    // c:collection(f13:double, f14:float, f15:bytes)
    DataBag bagColl = TypesUtils.createBag();
    Schema schColl = schema.getColumn(10).getSchema();
    Tuple tupColl1 = TypesUtils.createTuple(schColl);
    Tuple tupColl2 = TypesUtils.createTuple(schColl);
    byte[] abs1 = new byte[3];
    byte[] abs2 = new byte[4];
    tupColl1.set(0, 3.1415926);
    tupColl1.set(1, 1.6);
    abs1[0] = 11;
    abs1[1] = 12;
    abs1[2] = 13;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 123.456789);
    tupColl2.set(1, 100);
    abs2[0] = 21;
    abs2[1] = 22;
    abs2[2] = 23;
    abs2[3] = 24;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    tuple.set(10, bagColl);


    int row = 0;
    inserter.insert(new BytesWritable(String.format("k%d%d", part + 1, row + 1)
        .getBytes()), tuple);


    // row 2
    row++;
    TypesUtils.resetTuple(tuple);
    TypesUtils.resetTuple(tupRecord1);
    TypesUtils.resetTuple(tupRecord2);
    TypesUtils.resetTuple(tupRecord3);
    m1.clear();
    m2.clear();
    m3.clear();
    m4.clear();
    tuple.set(0, false);
    tuple.set(1, 2); // int
    tuple.set(2, 1002L); // long
    tuple.set(3, 3.1); // float
    tuple.set(4, "hello world 2"); // string
    tuple.set(5, new DataByteArray("hello byte 2")); // byte


    // r1:record(f1:int, f2:long
    tupRecord1.set(0, 2);
    tupRecord1.set(1, 1002L);
    tuple.set(6, tupRecord1);


    // r2:record(r3:record(f3:float, f4))
    tupRecord2.set(0, tupRecord3);
    tupRecord3.set(0, 2.3);
    tupRecord3.set(1, new DataByteArray("r3 row2  byte array"));
    tuple.set(7, tupRecord2);


    // m1:map(string)
    m1.put("a2", "A2");
    m1.put("b2", "B2");
    m1.put("c2", "C2");
    tuple.set(8, m1);


    // m2:map(map(int))
    m3.put("m321", 321);
    m3.put("m322", 322);
    m3.put("m323", 323);
    m2.put("z", m3);
    tuple.set(9, m2);


    // c:collection(f13:double, f14:float, f15:bytes)
    bagColl.clear();
    TypesUtils.resetTuple(tupColl1);
    TypesUtils.resetTuple(tupColl2);
    tupColl1.set(0, 7654.321);
    tupColl1.set(1, 0.0001);
    abs1[0] = 31;
    abs1[1] = 32;
    abs1[2] = 33;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 0.123456789);
    tupColl2.set(1, 0.3333);
    abs2[0] = 41;
    abs2[1] = 42;
    abs2[2] = 43;
    abs2[3] = 44;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    tuple.set(10, bagColl);


    inserter.insert(new BytesWritable(String.format("k%d%d", part + 1, row + 1)
        .getBytes()), tuple);

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    Tuple row = TypesUtils.createTuple(schema);
    // schema for "r:record..."
    Schema schRecord = writer.getSchema().getColumn(1).getSchema();
    Tuple tupRecord = TypesUtils.createTuple(schRecord);
    Schema schColl = schema.getColumn(3).getSchema();
    DataBag bagColl = TypesUtils.createBag();
    Tuple tupColl1 = TypesUtils.createTuple(schColl);
    Tuple tupColl2 = TypesUtils.createTuple(schColl);
    Map<String, String> map = new HashMap<String, String>();
    byte[] abs1 = new byte[3];
    byte[] abs2 = new byte[4];


    // row 1
    tupRecord.set(0, 1);
    tupRecord.set(1, 1001L);
    map.put("a", "x");
    map.put("b", "y");
    map.put("c", "z");
    tupColl1.set(0, 3.1415926);
    tupColl1.set(1, 1.6);
    abs1[0] = 11;
    abs1[1] = 12;
    abs1[2] = 13;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 123.456789);
    tupColl2.set(1, 100);
    abs2[0] = 21;
    abs2[1] = 22;
    abs2[2] = 23;
    abs2[3] = 24;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    row.set(0, true);
    row.set(1, tupRecord);
    row.set(2, map);
    row.set(3, bagColl);
    ins.insert(new BytesWritable("k1".getBytes()), row);


    // row 2
    TypesUtils.resetTuple(row);
    TypesUtils.resetTuple(tupRecord);
    map.clear();
    tupRecord.set(0, 2);
    tupRecord.set(1, 1002L);
    map.put("boy", "girl");
    map.put("adam", "amy");
    map.put("bob", "becky");
    map.put("carl", "cathy");
    bagColl.clear();
    TypesUtils.resetTuple(tupColl1);
    TypesUtils.resetTuple(tupColl2);
    tupColl1.set(0, 7654.321);
    tupColl1.set(1, 0.0001);
    abs1[0] = 31;
    abs1[1] = 32;
    abs1[2] = 33;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 0.123456789);
    tupColl2.set(1, 0.3333);
    abs2[0] = 41;
    abs2[1] = 42;
    abs2[2] = 43;
    abs2[3] = 44;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    row.set(0, false);
    row.set(1, tupRecord);
    row.set(2, map);
    row.set(3, bagColl);
    ins.insert(new BytesWritable("k2".getBytes()), row);

View Full Code Here

    Assert.assertEquals(1001L, tupRecord1.get(1));
    Map<String, String> map1 = (Map<String, String>) row.get(2);
    Assert.assertEquals("x", map1.get("a"));
    Assert.assertEquals("y", map1.get("b"));
    Assert.assertEquals("z", map1.get("c"));
    DataBag bagColl = (DataBag) row.get(3);
    Iterator<Tuple> itorColl = bagColl.iterator();
    Tuple tupColl = itorColl.next();
    Assert.assertEquals(3.1415926, tupColl.get(0));
    Assert.assertEquals(1.6, tupColl.get(1));
    DataByteArray dba = (DataByteArray) tupColl.get(2);
    Assert.assertEquals(11, dba.get()[0]);
    Assert.assertEquals(12, dba.get()[1]);
    Assert.assertEquals(13, dba.get()[2]);
    tupColl = itorColl.next();
    Assert.assertEquals(123.456789, tupColl.get(0));
    Assert.assertEquals(100, tupColl.get(1));
    dba = (DataByteArray) tupColl.get(2);
    Assert.assertEquals(21, dba.get()[0]);
    Assert.assertEquals(22, dba.get()[1]);
    Assert.assertEquals(23, dba.get()[2]);
    Assert.assertEquals(24, dba.get()[3]);


    // move to next row
    scanner.advance();
    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k2".getBytes()));
    TypesUtils.resetTuple(row);
    scanner.getValue(row);
    Assert.assertEquals(false, row.get(0));
    Tuple tupRecord2 = (Tuple) row.get(1);
    Assert.assertEquals(2, tupRecord2.get(0));
    Assert.assertEquals(1002L, tupRecord2.get(1));
    Map<String, String> map2 = (Map<String, String>) row.get(2);
    Assert.assertEquals("girl", map2.get("boy"));
    Assert.assertEquals("amy", map2.get("adam"));
    Assert.assertEquals("cathy", map2.get("carl"));
    bagColl = (DataBag) row.get(3);
    itorColl = bagColl.iterator();
    tupColl = itorColl.next();
    Assert.assertEquals(7654.321, tupColl.get(0));
    Assert.assertEquals(0.0001, tupColl.get(1));
    tupColl = itorColl.next();
    Assert.assertEquals(0.123456789, tupColl.get(0));

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    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    DataBag bagColl = (DataBag) row.get(0);


    boolean f1 = (Boolean) (row.get(1));
    Assert.assertEquals(true, f1);


    Iterator<Tuple> itorColl = bagColl.iterator();
    Tuple tupColl = itorColl.next();
    Assert.assertEquals(3.1415926, tupColl.get(0));
    try {
      Object obj = tupColl.get(1);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }
    tupColl = itorColl.next();
    Assert.assertEquals(123.456789, tupColl.get(0));
    Assert.assertNull(row.get(2));
    try {
      row.get(3);
      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);


    f1 = (Boolean) row.get(1);
    Assert.assertEquals(false, f1);


    bagColl.clear();
    bagColl = (DataBag) row.get(0);
    itorColl = bagColl.iterator();
    tupColl = itorColl.next();
    Assert.assertEquals(7654.321, tupColl.get(0));
    tupColl = itorColl.next();
    Assert.assertEquals(0.123456789, tupColl.get(0));
    Assert.assertNull(row.get(2));

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    BytesWritable key = new BytesWritable();


    scanner.getKey(key);
    Assert.assertEquals(key, new BytesWritable("k1".getBytes()));
    scanner.getValue(row);
    DataBag bagColl = (DataBag) row.get(0);
    Iterator<Tuple> itorColl = bagColl.iterator();
    Tuple tupColl = itorColl.next();
    Assert.assertEquals(1.6, tupColl.get(0));
    // make sure only 1 element returned in the collection
    try {
      Object obj = tupColl.get(1);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }
    tupColl = itorColl.next();
    Assert.assertEquals(100, tupColl.get(0));
    try {
      Object obj = tupColl.get(1);
      Assert.fail("Failed to catch 'out of boundary' exceptions.");
    } catch (IndexOutOfBoundsException e) {
      // no op, expecting out of bounds exceptions
    }
    Assert.assertFalse(itorColl.hasNext());
    Assert.assertEquals(true, row.get(1));
    Assert.assertEquals(1, row.get(2));
    Assert.assertNull(row.get(3));
    try {
      Object obj = row.get(4);
      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);
    bagColl.clear();
    bagColl = (DataBag) row.get(0);
    itorColl = bagColl.iterator();
    tupColl = itorColl.next();
    Assert.assertEquals(0.0001, tupColl.get(0));
    tupColl = itorColl.next();
    Assert.assertEquals(0.3333, tupColl.get(0));
    Assert.assertEquals(false, row.get(1));

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            Schema schema = op.getSchema();
            if(schema == null) {
                throw new ExecException("Example Generator requires a schema. Please provide a schema while loading data.");
            }
            
            DataBag opBaseData = BagFactory.getInstance().newDefaultBag();


            POLoad poLoad = (POLoad) LogToPhyMap.get(op);
//            PigContext oldPC = poLoad.getPc();
//            poLoad.setPc(pigContext);


            poLoad.setLineageTracer(new LineageTracer());


            Tuple t = null;
            int count = 0;
            for (Result res = poLoad.getNext(t); res.returnStatus != POStatus.STATUS_EOP
                    && count < MAX_RECORDS; res = poLoad.getNext(t)) {
                if (res.returnStatus == POStatus.STATUS_NULL)
                    continue;
                if (res.returnStatus == POStatus.STATUS_ERR) {
                    log.error("Error reading Tuple");
                } else {
                    opBaseData.add((Tuple) res.result);
                    count++;
                }


            }
            baseData.put((LOLoad) op, opBaseData);

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    m2.put("x", m3);
    m2.put("y", m4);
    tuple.set(9, m2);


    // c:collection(f13:double, f14:float, f15:bytes)
    DataBag bagColl = TypesUtils.createBag();
    Schema schColl = schema.getColumn(10).getSchema();
    Tuple tupColl1 = TypesUtils.createTuple(schColl);
    Tuple tupColl2 = TypesUtils.createTuple(schColl);
    byte[] abs1 = new byte[3];
    byte[] abs2 = new byte[4];
    tupColl1.set(0, 3.1415926);
    tupColl1.set(1, 1.6);
    abs1[0] = 11;
    abs1[1] = 12;
    abs1[2] = 13;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 123.456789);
    tupColl2.set(1, 100);
    abs2[0] = 21;
    abs2[1] = 22;
    abs2[2] = 23;
    abs2[3] = 24;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    tuple.set(10, bagColl);


    int row = 0;
    inserter.insert(new BytesWritable(String.format("k%d%d", part + 1, row + 1)
        .getBytes()), tuple);


    // row 2
    row++;
    TypesUtils.resetTuple(tuple);
    TypesUtils.resetTuple(tupRecord1);
    TypesUtils.resetTuple(tupRecord2);
    TypesUtils.resetTuple(tupRecord3);
    m1.clear();
    m2.clear();
    m3.clear();
    m4.clear();
    tuple.set(0, false);
    tuple.set(1, 2); // int
    tuple.set(2, 1002L); // long
    tuple.set(3, 3.1); // float
    tuple.set(4, "hello world 2"); // string
    tuple.set(5, new DataByteArray("hello byte 2")); // byte


    // r1:record(f1:int, f2:long
    tupRecord1.set(0, 2);
    tupRecord1.set(1, 1002L);
    tuple.set(6, tupRecord1);


    // r2:record(r3:record(f3:float, f4))
    tupRecord2.set(0, tupRecord3);
    tupRecord3.set(0, 2.3);
    tupRecord3.set(1, new DataByteArray("r3 row2  byte array"));
    tuple.set(7, tupRecord2);


    // m1:map(string)
    m1.put("a2", "A2");
    m1.put("b2", "B2");
    m1.put("c2", "C2");
    tuple.set(8, m1);


    // m2:map(map(int))
    m3.put("m321", 321);
    m3.put("m322", 322);
    m3.put("m323", 323);
    m2.put("z", m3);
    tuple.set(9, m2);


    // c:collection(f13:double, f14:float, f15:bytes)
    bagColl.clear();
    TypesUtils.resetTuple(tupColl1);
    TypesUtils.resetTuple(tupColl2);
    tupColl1.set(0, 7654.321);
    tupColl1.set(1, 0.0001);
    abs1[0] = 31;
    abs1[1] = 32;
    abs1[2] = 33;
    tupColl1.set(2, new DataByteArray(abs1));
    bagColl.add(tupColl1);
    tupColl2.set(0, 0.123456789);
    tupColl2.set(1, 0.3333);
    abs2[0] = 41;
    abs2[1] = 42;
    abs2[2] = 43;
    abs2[3] = 44;
    tupColl2.set(2, new DataByteArray(abs2));
    bagColl.add(tupColl2);
    tuple.set(10, bagColl);


    inserter.insert(new BytesWritable(String.format("k%d%d", part + 1, row + 1)
        .getBytes()), tuple);

View Full Code Here


public class TestBagFormat extends TestCase {


    public static void testBagFormat() {
        try {
            DataBag bag = BagFactory.getInstance().newDefaultBag();


            Tuple tuple_1 = TupleFactory.getInstance().newTuple(1);
            tuple_1.set(0, 12);
            bag.add(tuple_1);


            Tuple tuple_2 = TupleFactory.getInstance().newTuple(1);
            DataBag innerBag = BagFactory.getInstance().newDefaultBag();
            innerBag.add(tuple_1);
            tuple_2.set(0, (innerBag));
            bag.add(tuple_2);


            System.out.println(BagFormat.format(bag));
            assertEquals("{(12),({(12)})}", BagFormat.format(bag));

View Full Code Here

    @Test
    public void testBag() throws Exception{
        String myBag = "{(1,a),(2,b)}";
        Object o = ps.getLoadCaster().bytesToBag(myBag.getBytes(), getBagFieldSchema());
        assertTrue(o instanceof DataBag);
        DataBag b = (DataBag)o;
        DataBag expectedBag = bagFactory.newDefaultBag();
        Tuple expectedTuple = tupleFactory.newTuple(2);
        expectedTuple.set(0, 1);
        expectedTuple.set(1, "a");
        expectedBag.add(expectedTuple);
        expectedTuple = tupleFactory.newTuple(2);
        expectedTuple.set(0, 2);
        expectedTuple.set(1, "b");
        expectedBag.add(expectedTuple);
        assertTrue(b.equals(expectedBag));
    }

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    @Test
    public void testEmptyBag() throws Exception{
        String myBag = "{}";
        Object o = ps.getLoadCaster().bytesToBag(myBag.getBytes(), getBagFieldSchema());
        assertTrue(o instanceof DataBag);
        DataBag b = (DataBag)o;
        assertTrue(b.size()==0);
    }

View Full Code Here

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