Examples of eu.stratosphere.types.Record

eu.stratosphere.types.Record
Record is the basic data record that flows between functions in a Stratosphere program. The record is a tuple of arbitrary values. It implements a sparse tuple model, meaning that the record can contain many fields which are actually null and not represented in the record. It has internally a bitmap marking which fields are set and which are not.
For efficient data exchange, a record that is read from any source holds its data in serialized binary form. Fields are deserialized lazily upon first access. Modified fields are cached and the modifications are incorporated into the binary representation upon the next serialization or any explicit call to the {@link #updateBinaryRepresenation()} method.
IMPORTANT NOTE: Records must be used as mutable objects and be reused across user function calls in order to achieve performance. The record is a heavy-weight object, designed to minimize calls to the individual fields' serialization and deserialization methods. It holds quite a bit of state consumes a comparably large amount of memory (> 200 bytes in a 64 bit JVM) due to several pointers and arrays.
This class is NOT thread-safe!

    this.memoryManager.allocatePages(this.parentTask, memory, NUM_MEMORY_SEGMENTS);
    final SpillingBuffer outView = new SpillingBuffer(this.ioManager, 
              new ListMemorySegmentSource(memory), this.memoryManager.getPageSize());
    
    // write a number of pairs
    final Record rec = new Record();
    for (int i = 0; i < NUM_PAIRS_INMEM; i++) {
      generator.next(rec);
      rec.write(outView);
    }
    
    // create the reader input view
    DataInputView inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    final Record readRec = new Record();
    for (int i = 0; i < NUM_PAIRS_INMEM; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    // re-read the data
    inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    for (int i = 0; i < NUM_PAIRS_INMEM; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    this.memoryManager.release(outView.close());

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    this.memoryManager.allocatePages(this.parentTask, memory, NUM_MEMORY_SEGMENTS);
    final SpillingBuffer outView = new SpillingBuffer(this.ioManager, 
              new ListMemorySegmentSource(memory), this.memoryManager.getPageSize());
    
    // write a number of pairs
    final Record rec = new Record();
    for (int i = 0; i < NUM_PAIRS_INMEM; i++) {
      generator.next(rec);
      rec.write(outView);
    }
    
    // create the reader input view
    DataInputView inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    final Record readRec = new Record();
    try {
      for (int i = 0; i < NUM_PAIRS_INMEM + 1; i++) {
        generator.next(rec);
        readRec.read(inView);
        
        Key k1 = rec.getField(0, Key.class);
        Value v1 = rec.getField(1, Value.class);
        
        Key k2 = readRec.getField(0, Key.class);
        Value v2 = readRec.getField(1, Value.class);
        
        Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
      }
      Assert.fail("Read too much, expected EOFException.");
    }
    catch (EOFException eofex) {
      // expected
    }
    
    // re-read the data
    inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    for (int i = 0; i < NUM_PAIRS_INMEM; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    this.memoryManager.release(outView.close());

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    this.memoryManager.allocatePages(this.parentTask, memory, NUM_MEMORY_SEGMENTS);
    final SpillingBuffer outView = new SpillingBuffer(this.ioManager, 
              new ListMemorySegmentSource(memory), this.memoryManager.getPageSize());
    
    // write a number of pairs
    final Record rec = new Record();
    for (int i = 0; i < NUM_PAIRS_EXTERNAL; i++) {
      generator.next(rec);
      rec.write(outView);
    }
    
    // create the reader input view
    DataInputView inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    final Record readRec = new Record();
    for (int i = 0; i < NUM_PAIRS_EXTERNAL; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    // re-read the data
    inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    for (int i = 0; i < NUM_PAIRS_EXTERNAL; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    this.memoryManager.release(outView.close());

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    this.memoryManager.allocatePages(this.parentTask, memory, NUM_MEMORY_SEGMENTS);
    final SpillingBuffer outView = new SpillingBuffer(this.ioManager, 
              new ListMemorySegmentSource(memory), this.memoryManager.getPageSize());
    
    // write a number of pairs
    final Record rec = new Record();
    for (int i = 0; i < NUM_PAIRS_EXTERNAL; i++) {
      generator.next(rec);
      rec.write(outView);
    }
    
    // create the reader input view
    DataInputView inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    final Record readRec = new Record();
    try {
      for (int i = 0; i < NUM_PAIRS_EXTERNAL + 1; i++) {
        generator.next(rec);
        readRec.read(inView);
        
        Key k1 = rec.getField(0, Key.class);
        Value v1 = rec.getField(1, Value.class);
        
        Key k2 = readRec.getField(0, Key.class);
        Value v2 = readRec.getField(1, Value.class);
        
        Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
      }
      Assert.fail("Read too much, expected EOFException.");
    }
    catch (EOFException eofex) {
      // expected
    }
    
    // re-read the data
    inView = outView.flip();
    generator.reset();
    
    // read and re-generate all records and compare them
    for (int i = 0; i < NUM_PAIRS_EXTERNAL; i++) {
      generator.next(rec);
      readRec.read(inView);
      
      Key k1 = rec.getField(0, Key.class);
      Value v1 = rec.getField(1, Value.class);
      
      Key k2 = readRec.getField(0, Key.class);
      Value v2 = readRec.getField(1, Value.class);
      
      Assert.assertTrue("The re-generated and the read record do not match.", k1.equals(k2) && v1.equals(v2));
    }
    
    this.memoryManager.release(outView.close());

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    return false;
  }
  
  @Override
  public Record createInstance() {
    return new Record(); 
  }

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    this.memman = new DefaultMemoryManager(MEMORY_CAPACITY);
    
    // create test objects
    this.objects = new ArrayList<Record>(20000);
    for (int i = 0; i < NUM_VALUES; ++i) {
      this.objects.add(new Record(new IntValue(i)));
    }
    
    // create the reader
    this.reader = new MutableObjectIteratorWrapper(this.objects.iterator());
  }

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      int upper = 0;
      do {
        lower = upper;
        upper = lower;
        // find the upper bound
        Record target = new Record();
        while ((target = iterator.next(target)) != null) {
          int val = target.getField(0, IntValue.class).getValue();
          Assert.assertEquals(upper++, val);
        }
        // now reset the buffer a few times
        for (int i = 0; i < 5; ++i) {
          iterator.reset();
          target = new Record();
          int count = 0;
          while ((target = iterator.next(target)) != null) {
            int val = target.getField(0, IntValue.class).getValue();
            Assert.assertEquals(lower + (count++), val);
          }
          Assert.assertEquals(upper - lower, count);
        }
      } while (iterator.nextBlock());

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      int upper = 0;
      do {
        lower = upper;
        upper = lower;


        Record target = new Record();
        // find the upper bound
        while ((target = iterator.next(target)) != null) {
          int val = target.getField(0, IntValue.class).getValue();
          Assert.assertEquals(upper++, val);
        }
        // now reset the buffer a few times
        for (int i = 0; i < 5; ++i) {
          iterator.reset();
          target = new Record();
          int count = 0;
          while ((target = iterator.next(target)) != null) {
            int val = target.getField(0, IntValue.class).getValue();
            Assert.assertEquals(lower + (count++), val);
          }
          Assert.assertEquals(upper - lower, count);
        }
      } while (iterator.nextBlock());

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  static Map<TestData.Key, Collection<TestData.Value>> collectRecordData(MutableObjectIterator<Record> iter)
  throws Exception
  {
    Map<TestData.Key, Collection<TestData.Value>> map = new HashMap<TestData.Key, Collection<TestData.Value>>();
    Record pair = new Record();
    
    while ((pair = iter.next(pair)) != null) {


      TestData.Key key = pair.getField(0, TestData.Key.class);
      if (!map.containsKey(key)) {
        map.put(new TestData.Key(key.getKey()), new ArrayList<TestData.Value>());
      }


      Collection<TestData.Value> values = map.get(key);
      values.add(new TestData.Value(pair.getField(1, TestData.Value.class).getValue()));
    }


    return map;
  }

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      this.recordBuildSideComparator, this.recordProbeSideComparator, this.pactRecordComparator,
      memSegments, ioManager);
    join.open(buildInput, probeInput);
    
    
    final Record recordReuse = new Record();
    int numRecordsInJoinResult = 0;
    
    while (join.nextRecord()) {
      HashBucketIterator<Record, Record> buildSide = join.getBuildSideIterator();
      while (buildSide.next(recordReuse) != null) {

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