Package org.apache.hadoop.io.file.tfile.TFile.Reader

Examples of org.apache.hadoop.io.file.tfile.TFile.Reader.Scanner

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    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Assert.assertFalse(reader.isSorted());
    Assert.assertEquals((int) reader.getEntryCount(), 4);

    Scanner scanner = reader.createScanner();

    try {

      // read key and value
      byte[] kbuf = new byte[BUF_SIZE];
      int klen = scanner.entry().getKeyLength();
      scanner.entry().getKey(kbuf);
      Assert.assertEquals(new String(kbuf, 0, klen), "keyZ");

      byte[] vbuf = new byte[BUF_SIZE];
      int vlen = scanner.entry().getValueLength();
      scanner.entry().getValue(vbuf);
      Assert.assertEquals(new String(vbuf, 0, vlen), "valueZ");

      scanner.advance();

      // now try get value first
      vbuf = new byte[BUF_SIZE];
      vlen = scanner.entry().getValueLength();
      scanner.entry().getValue(vbuf);
      Assert.assertEquals(new String(vbuf, 0, vlen), "valueM");

      kbuf = new byte[BUF_SIZE];
      klen = scanner.entry().getKeyLength();
      scanner.entry().getKey(kbuf);
      Assert.assertEquals(new String(kbuf, 0, klen), "keyM");
    }
    finally {
      scanner.close();
      reader.close();
    }
  }
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    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Assert.assertFalse(reader.isSorted());
    Assert.assertEquals((int) reader.getEntryCount(), 4);

    Scanner scanner = reader.createScanner();

    try {

      // read key and value
      byte[] kbuf = new byte[BUF_SIZE];
      int klen = scanner.entry().getKeyLength();
      scanner.entry().getKey(kbuf);
      Assert.assertEquals(new String(kbuf, 0, klen), "keyZ");

      byte[] vbuf = new byte[BUF_SIZE];
      int vlen = scanner.entry().getValueLength();
      scanner.entry().getValue(vbuf);
      Assert.assertEquals(new String(vbuf, 0, vlen), "valueZ");

      scanner.advance();

      // now try get value first
      vbuf = new byte[BUF_SIZE];
      vlen = scanner.entry().getValueLength();
      scanner.entry().getValue(vbuf);
      Assert.assertEquals(new String(vbuf, 0, vlen), "valueM");

      kbuf = new byte[BUF_SIZE];
      klen = scanner.entry().getKeyLength();
      scanner.entry().getKey(kbuf);
      Assert.assertEquals(new String(kbuf, 0, klen), "keyM");
    }
    finally {
      scanner.close();
      reader.close();
    }
  }
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  }

  public void testFailureSeek() throws IOException {
    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();

    try {
      // can't find ceil
      try {
        scanner.lowerBound("keyN".getBytes());
        Assert.fail("Cannot search in a unsorted TFile!");
      }
      catch (Exception e) {
        // noop, expecting excetions
      }
      finally {
      }

      // can't find higher
      try {
        scanner.upperBound("keyA".getBytes());
        Assert.fail("Cannot search higher in a unsorted TFile!");
      }
      catch (Exception e) {
        // noop, expecting excetions
      }
      finally {
      }

      // can't seek
      try {
        scanner.seekTo("keyM".getBytes());
        Assert.fail("Cannot search a unsorted TFile!");
      }
      catch (Exception e) {
        // noop, expecting excetions
      }
      finally {
      }
    }
    finally {
      scanner.close();
      reader.close();
    }
  }
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      return;
    closeOutput();

    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Assert.assertTrue(reader.isSorted());
    Scanner scanner = reader.createScanner();
    Assert.assertTrue(scanner.atEnd());
    scanner.close();
    reader.close();
  }
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  public void testLocate() throws IOException {
    if (skip)
      return;
    writeRecords(3 * records1stBlock);
    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();
    Location loc2 =
        locate(scanner, composeSortedKey(KEY, 3 * records1stBlock, 2)
            .getBytes());
    Location locLastIn1stBlock =
        locate(scanner, composeSortedKey(KEY, 3 * records1stBlock,
            records1stBlock - 1).getBytes());
    Location locFirstIn2ndBlock =
        locate(scanner, composeSortedKey(KEY, 3 * records1stBlock,
            records1stBlock).getBytes());
    Location locX = locate(scanner, "keyX".getBytes());
    Assert.assertEquals(scanner.endLocation, locX);
    scanner.close();
    reader.close();
  }
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    if (skip)
      return;
    writeRecords(5);

    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();

    byte[] vbuf = new byte[BUF_SIZE];
    int vlen = scanner.entry().getValueLength();
    scanner.entry().getValue(vbuf);
    Assert.assertEquals(new String(vbuf, 0, vlen), VALUE + 0);
    try {
      scanner.entry().getValue(vbuf);
      Assert.fail("Cannot get the value mlutiple times.");
    }
    catch (Exception e) {
      // noop, expecting exceptions
    }

    scanner.close();
    reader.close();
  }
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    if (skip)
      return;
    closeOutput();

    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();
    try {
      scanner.lowerBound("keyX".getBytes(), -1, 4);
      Assert.fail("Error on handling negative offset.");
    }
    catch (Exception e) {
      // noop, expecting exceptions
    }
    finally {
      reader.close();
      scanner.close();
    }
    closeOutput();
  }
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    if (skip)
      return;
    closeOutput();

    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();
    try {
      scanner.lowerBound("keyX".getBytes(), 0, -1);
      Assert.fail("Error on handling negative length.");
    }
    catch (Exception e) {
      // noop, expecting exceptions
    }
    finally {
      scanner.close();
      reader.close();
    }
    closeOutput();
  }
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      return;
    writeRecords(3);

    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();
    try {
      // test negative array offset
      try {
        scanner.seekTo("keyY".getBytes(), -1, 4);
        Assert.fail("Failed to handle negative offset.");
      } catch (Exception e) {
        // noop, expecting exceptions
      }

      // test negative array length
      try {
        scanner.seekTo("keyY".getBytes(), 0, -2);
        Assert.fail("Failed to handle negative key length.");
      } catch (Exception e) {
        // noop, expecting exceptions
      }
    } finally {
      reader.close();
      scanner.close();
    }
  }
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  static void readRecords(FileSystem fs, Path path, int count,
      Configuration conf) throws IOException {
    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Scanner scanner = reader.createScanner();

    try {
      for (int nx = 0; nx < count; nx++, scanner.advance()) {
        Assert.assertFalse(scanner.atEnd());
        // Assert.assertTrue(scanner.next());

        byte[] kbuf = new byte[BUF_SIZE];
        int klen = scanner.entry().getKeyLength();
        scanner.entry().getKey(kbuf);
        Assert.assertEquals(new String(kbuf, 0, klen), composeSortedKey(KEY,
            count, nx));

        byte[] vbuf = new byte[BUF_SIZE];
        int vlen = scanner.entry().getValueLength();
        scanner.entry().getValue(vbuf);
        Assert.assertEquals(new String(vbuf, 0, vlen), VALUE + nx);
      }

      Assert.assertTrue(scanner.atEnd());
      Assert.assertFalse(scanner.advance());
    }
    finally {
      scanner.close();
      reader.close();
    }
  }
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Related Classes of org.apache.hadoop.io.file.tfile.TFile.Reader.Scanner

  • org.apache.hadoop.io.file.tfile.TestTFile
  • org.apache.hadoop.io.file.tfile.TestTFileByteArrays
  • org.apache.hadoop.io.file.tfile.TestTFileSeek
  • org.apache.hadoop.io.file.tfile.TestTFileSplit
  • org.apache.hadoop.io.file.tfile.TestTFileStreams
  • org.apache.hadoop.io.file.tfile.TestTFileUnsortedByteArrays
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