Examples of org.apache.pig.piggybank.storage.IndexedStorage

Package org.apache.pig.piggybank.storage

Examples of org.apache.pig.piggybank.storage.IndexedStorage

org.apache.pig.piggybank.storage.IndexedStorage
IndexedStorage is a form of PigStorage that supports a per record seek. IndexedStorage creates a separate (hidden) index file for every data file that is written. The format of the index file is:
```
 | Header     | | Index Body | | Footer     | 
```
The Header contains the list of record indices (field numbers) that represent index keys. The Index Body contains a Tuple for each record in the data. The fields of the Tuple are:
- The index key(s) Tuple
- The number of records that share this index key.
- Offset into the data file to read the first matching record.
The Footer contains sequentially:
- The smallest key(s) Tuple in the index.
- The largest key(s) Tuple in the index.
- The offset in bytes to the start of the footer
IndexStorage implements IndexableLoadFunc and can be used as the 'right table' in a PIG 'merge' or 'merge-sparse' join. IndexStorage does not require the data to be globally partitioned & sorted by index keys. Each partition (separate index) must be locally sorted. Also note IndexStorage is a loader to demonstrate "merge-sparse" join.

    @Test
    /**
     * Tests getNext called repeatedly returns items in sorted order.
     */
    public void testGetNext() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId = HadoopShims.createTaskAttemptID("jt", 1, true, 1, 1);
        conf.set(MRConfiguration.TASK_ID, taskId.toString());


        conf.set(MRConfiguration.INPUT_DIR, Util.encodeEscape(outputDir.getAbsolutePath()));
        storage.initialize(conf);


        Integer key;
        int [][] correctValues = {{2,2},{3,2},{3,3},{4,3},{4,4},{5,5},{5,5},{6,6},{7,7},{8,8},{9,9},{10,10},{11,11},{13,13}};
        for (int [] outer : correctValues) {
            System.out.println("Testing: (" + outer[0] + "," + outer[1] + ")");
            Tuple read = storage.getNext();
            System.out.println("Read: " + read);


            key = Integer.decode(((DataByteArray)read.get(0)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[0]));
            key = Integer.decode(((DataByteArray)read.get(1)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[1]));
        }
        Tuple read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests seekNear and getNext work correctly.
     */
    public void testSeek() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId =  HadoopShims.createTaskAttemptID("jt", 2, true, 2, 2);
        conf.set(MRConfiguration.TASK_ID, taskId.toString());


        conf.set(MRConfiguration.INPUT_DIR, Util.encodeEscape(outputDir.getAbsolutePath()));
        storage.initialize(conf);


        TupleFactory tupleFactory = TupleFactory.getInstance();
        Tuple seek = tupleFactory.newTuple(2);
        Integer key;
        Tuple read;


        //Seek to 1,1 (not in index). getNext should return 2
        seek.set(0, new Integer(1));
        seek.set(1, new Integer(1));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //Seek to 3,2.  getNext should return 3,2
        seek.set(0, new Integer(3));
        seek.set(1, new Integer(2));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //getNext should return 3,3
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));


        //Seek to 6,6.  getNext should return 6,6
        seek.set(0, new Integer(6));
        seek.set(1, new Integer(6));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));


        //getNext should return 7,7
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));


        //Seek to 9,9.  getNext should return 9,9
        seek.set(0, new Integer(9));
        seek.set(1, new Integer(9));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));


        //getNext should return 10,10
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));




        //Seek to 13,12 (Not in index).  getNext should return 13,13
        seek.set(0, new Integer(13));
        seek.set(1, new Integer(12));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));


        //Seek to 20 (Not in index). getNext should return null
        seek.set(0, new Integer(20));
        seek.set(1, new Integer(20));
        storage.seekNear(seek);
        read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests getNext called repeatedly returns items in sorted order.
     */
    public void testGetNext() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId = HadoopShims.createTaskAttemptID("jt", 1, true, 1, 1);
        conf.set("mapred.task.id", taskId.toString());


        conf.set("mapred.input.dir", Util.encodeEscape(outputDir.getAbsolutePath()));
        storage.initialize(conf);


        Integer key;
        int [][] correctValues = {{2,2},{3,2},{3,3},{4,3},{4,4},{5,5},{5,5},{6,6},{7,7},{8,8},{9,9},{10,10},{11,11},{13,13}};
        for (int [] outer : correctValues) {
            System.out.println("Testing: (" + outer[0] + "," + outer[1] + ")");
            Tuple read = storage.getNext();
            System.out.println("Read: " + read);


            key = Integer.decode(((DataByteArray)read.get(0)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[0]));
            key = Integer.decode(((DataByteArray)read.get(1)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[1]));
        }
        Tuple read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests seekNear and getNext work correctly.
     */
    public void testSeek() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId =  HadoopShims.createTaskAttemptID("jt", 2, true, 2, 2);
        conf.set("mapred.task.id", taskId.toString());


        conf.set("mapred.input.dir", Util.encodeEscape(outputDir.getAbsolutePath()));
        storage.initialize(conf);


        TupleFactory tupleFactory = TupleFactory.getInstance();
        Tuple seek = tupleFactory.newTuple(2);
        Integer key;
        Tuple read;


        //Seek to 1,1 (not in index). getNext should return 2
        seek.set(0, new Integer(1));
        seek.set(1, new Integer(1));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //Seek to 3,2.  getNext should return 3,2
        seek.set(0, new Integer(3));
        seek.set(1, new Integer(2));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //getNext should return 3,3
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));


        //Seek to 6,6.  getNext should return 6,6
        seek.set(0, new Integer(6));
        seek.set(1, new Integer(6));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));


        //getNext should return 7,7
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));


        //Seek to 9,9.  getNext should return 9,9
        seek.set(0, new Integer(9));
        seek.set(1, new Integer(9));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));


        //getNext should return 10,10
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));




        //Seek to 13,12 (Not in index).  getNext should return 13,13
        seek.set(0, new Integer(13));
        seek.set(1, new Integer(12));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));


        //Seek to 20 (Not in index). getNext should return null
        seek.set(0, new Integer(20));
        seek.set(1, new Integer(20));
        storage.seekNear(seek);
        read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests getNext called repeatedly returns items in sorted order.
     */
    public void testGetNext() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId = HadoopShims.createTaskAttemptID("jt", 1, true, 1, 1);
        conf.set("mapred.task.id", taskId.toString());


        conf.set("mapred.input.dir", outputDir.getAbsolutePath());
        storage.initialize(conf);


        Integer key;
        int [][] correctValues = {{2,2},{3,2},{3,3},{4,3},{4,4},{5,5},{5,5},{6,6},{7,7},{8,8},{9,9},{10,10},{11,11},{13,13}};
        for (int [] outer : correctValues) {
            System.out.println("Testing: (" + outer[0] + "," + outer[1] + ")");
            Tuple read = storage.getNext();
            System.out.println("Read: " + read);


            key = Integer.decode(((DataByteArray)read.get(0)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[0]));
            key = Integer.decode(((DataByteArray)read.get(1)).toString());
            assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[1]));
        }
        Tuple read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests seekNear and getNext work correctly.
     */
    public void testSeek() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);


        TaskAttemptID taskId =  HadoopShims.createTaskAttemptID("jt", 2, true, 2, 2);
        conf.set("mapred.task.id", taskId.toString());


        conf.set("mapred.input.dir", outputDir.getAbsolutePath());
        storage.initialize(conf);


        TupleFactory tupleFactory = TupleFactory.getInstance();
        Tuple seek = tupleFactory.newTuple(2);
        Integer key;
        Tuple read;


        //Seek to 1,1 (not in index). getNext should return 2
        seek.set(0, new Integer(1));
        seek.set(1, new Integer(1));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //Seek to 3,2.  getNext should return 3,2
        seek.set(0, new Integer(3));
        seek.set(1, new Integer(2));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(2));


        //getNext should return 3,3
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(3));


        //Seek to 6,6.  getNext should return 6,6
        seek.set(0, new Integer(6));
        seek.set(1, new Integer(6));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(6));


        //getNext should return 7,7
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(7));


        //Seek to 9,9.  getNext should return 9,9
        seek.set(0, new Integer(9));
        seek.set(1, new Integer(9));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(9));


        //getNext should return 10,10
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(10));




        //Seek to 13,12 (Not in index).  getNext should return 13,13
        seek.set(0, new Integer(13));
        seek.set(1, new Integer(12));
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        assertTrue("GetNext did not return the correct value", key.equals(13));


        //Seek to 20 (Not in index). getNext should return null
        seek.set(0, new Integer(20));
        seek.set(1, new Integer(20));
        storage.seekNear(seek);
        read = storage.getNext();
        assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests getNext called repeatedly returns items in sorted order.
     */ 
    public void testGetNext() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);
        
        TaskAttemptID taskId = HadoopShims.createTaskAttemptID("jt", 1, true, 1, 1);
        conf.set("mapred.task.id", taskId.toString());
        
        conf.set("mapred.input.dir","out");
        storage.initialize(conf);
       
        Integer key; 
        int [][] correctValues = {{2,2},{3,2},{3,3},{4,3},{4,4},{5,5},{5,5},{6,6},{7,7},{8,8},{9,9},{10,10},{11,11},{13,13}};
        for (int [] outer : correctValues) {
            System.out.println("Testing: (" + outer[0] + "," + outer[1] + ")");
            Tuple read = storage.getNext();
            System.out.println("Read: " + read);


            key = Integer.decode(((DataByteArray)read.get(0)).toString());
            Assert.assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[0]));
            key = Integer.decode(((DataByteArray)read.get(1)).toString());
            Assert.assertTrue("GetNext did not return the correct value.  Received: " + read, key.equals(outer[1]));
        }
        Tuple read = storage.getNext();
        Assert.assertTrue("GetNext did not return the correct value", (read == null));
    }

View Full Code Here

    @Test
    /**
     * Tests seekNear and getNext work correctly.
     */ 
    public void testSeek() throws IOException, InterruptedException {
        IndexedStorage storage = new IndexedStorage("\t","0,1");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        LocalFileSystem fs = FileSystem.getLocal(conf);
        
        TaskAttemptID taskId =  HadoopShims.createTaskAttemptID("jt", 2, true, 2, 2);
        conf.set("mapred.task.id", taskId.toString());
        
        conf.set("mapred.input.dir","out");
        storage.initialize(conf);


        TupleFactory tupleFactory = TupleFactory.getInstance();
        Tuple seek = tupleFactory.newTuple(2);
        Integer key;
        Tuple read;


        //Seek to 1,1 (not in index). getNext should return 2
        seek.set(0, new Integer(1)); 
        seek.set(1, new Integer(1)); 
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(2));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(2));


        //Seek to 3,2.  getNext should return 3,2
        seek.set(0, new Integer(3)); 
        seek.set(1, new Integer(2)); 
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(2));


        //getNext should return 3,3
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(3));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(3));


        //Seek to 6,6.  getNext should return 6,6
        seek.set(0, new Integer(6)); 
        seek.set(1, new Integer(6)); 
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(6));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(6));


        //getNext should return 7,7
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(7));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(7));


        //Seek to 9,9.  getNext should return 9,9
        seek.set(0, new Integer(9)); 
        seek.set(1, new Integer(9)); 
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(9));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(9));


        //getNext should return 10,10
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(10));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(10));




        //Seek to 13,12 (Not in index).  getNext should return 13,13
        seek.set(0, new Integer(13)); 
        seek.set(1, new Integer(12)); 
        storage.seekNear(seek);
        read = storage.getNext();
        key = Integer.decode(((DataByteArray)read.get(0)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(13));
        key = Integer.decode(((DataByteArray)read.get(1)).toString());
        Assert.assertTrue("GetNext did not return the correct value", key.equals(13));


        //Seek to 20 (Not in index). getNext should return null 
        seek.set(0, new Integer(20)); 
        seek.set(1, new Integer(20)); 
        storage.seekNear(seek);
        read = storage.getNext();
        Assert.assertTrue("GetNext did not return the correct value", (read == null));
    }

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