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

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

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    }
  }

  private void readValueWithoutKey(int count, int recordIndex)
      throws IOException {
    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);

    Scanner scanner =
        reader.createScanner(composeSortedKey(KEY, count, recordIndex)
            .getBytes(), null);

    byte[] vbuf1 = new byte[BUF_SIZE];
    int vlen1 = scanner.entry().getValueLength();
    scanner.entry().getValue(vbuf1);
    Assert.assertEquals(new String(vbuf1, 0, vlen1), VALUE + recordIndex);

    if (scanner.advance() && !scanner.atEnd()) {
      byte[] vbuf2 = new byte[BUF_SIZE];
      int vlen2 = scanner.entry().getValueLength();
      scanner.entry().getValue(vbuf2);
      Assert.assertEquals(new String(vbuf2, 0, vlen2), VALUE
          + (recordIndex + 1));
    }

    scanner.close();
    reader.close();
  }
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    scanner.close();
    reader.close();
  }

  private void readKeyManyTimes(int count, int recordIndex) throws IOException {
    Reader reader = new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);

    Scanner scanner =
        reader.createScanner(composeSortedKey(KEY, count, recordIndex)
            .getBytes(), null);

    // read the indexed key
    byte[] kbuf1 = new byte[BUF_SIZE];
    int klen1 = scanner.entry().getKeyLength();
    scanner.entry().getKey(kbuf1);
    Assert.assertEquals(new String(kbuf1, 0, klen1), composeSortedKey(KEY,
        count, recordIndex));

    klen1 = scanner.entry().getKeyLength();
    scanner.entry().getKey(kbuf1);
    Assert.assertEquals(new String(kbuf1, 0, klen1), composeSortedKey(KEY,
        count, recordIndex));

    klen1 = scanner.entry().getKeyLength();
    scanner.entry().getKey(kbuf1);
    Assert.assertEquals(new String(kbuf1, 0, klen1), composeSortedKey(KEY,
        count, recordIndex));

    scanner.close();
    reader.close();
  }
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    FSDataOutputStream fout = createFSOutput(ncTFile);
    Writer writer = new Writer(fout, minBlockSize, codec, "memcmp", conf);
    writeRecords(writer);
    fout.close();
    FSDataInputStream fin = fs.open(ncTFile);
    Reader reader =
        new Reader(fs.open(ncTFile), fs.getFileStatus(ncTFile).getLen(), conf);

    Scanner scanner = reader.createScanner();
    readAllRecords(scanner);
    scanner.seekTo(getSomeKey(50));
    assertTrue("location lookup failed", scanner.seekTo(getSomeKey(50)));
    // read the key and see if it matches
    byte[] readKey = readKey(scanner);
    assertTrue("seeked key does not match", Arrays.equals(getSomeKey(50),
        readKey));

    scanner.seekTo(new byte[0]);
    byte[] val1 = readValue(scanner);
    scanner.seekTo(new byte[0]);
    byte[] val2 = readValue(scanner);
    assertTrue(Arrays.equals(val1, val2));
   
    // check for lowerBound
    scanner.lowerBound(getSomeKey(50));
    assertTrue("locaton lookup failed", scanner.currentLocation
        .compareTo(reader.end()) < 0);
    readKey = readKey(scanner);
    assertTrue("seeked key does not match", Arrays.equals(readKey,
        getSomeKey(50)));

    // check for upper bound
    scanner.upperBound(getSomeKey(50));
    assertTrue("location lookup failed", scanner.currentLocation
        .compareTo(reader.end()) < 0);
    readKey = readKey(scanner);
    assertTrue("seeked key does not match", Arrays.equals(readKey,
        getSomeKey(51)));

    scanner.close();
    // test for a range of scanner
    scanner = reader.createScanner(getSomeKey(10), getSomeKey(60));
    readAndCheckbytes(scanner, 10, 50);
    assertFalse(scanner.advance());
    scanner.close();
    reader.close();
    fin.close();
    fs.delete(ncTFile, true);
  }
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    Writer writer = new Writer(fout, minBlockSize, codec, null, conf);
    writeRecords(writer);
    writer.close();
    fout.close();
    FSDataInputStream fin = fs.open(uTfile);
    Reader reader =
        new Reader(fs.open(uTfile), fs.getFileStatus(uTfile).getLen(), conf);

    Scanner scanner = reader.createScanner();
    readAllRecords(scanner);
    scanner.close();
    reader.close();
    fin.close();
    fs.delete(uTfile, true);
  }
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    Writer writer = new Writer(fout, minBlockSize, "none", null, conf);
    someTestingWithMetaBlock(writer, "none");
    writer.close();
    fout.close();
    FSDataInputStream fin = fs.open(mFile);
    Reader reader = new Reader(fin, fs.getFileStatus(mFile).getLen(), conf);
    someReadingWithMetaBlock(reader);
    fs.delete(mFile, true);
    reader.close();
    fin.close();
  }
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    fs.delete(path, true);
  }

  // we still can scan records in an unsorted TFile
  public void testFailureScannerWithKeys() throws IOException {
    Reader reader =
        new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf);
    Assert.assertFalse(reader.isSorted());
    Assert.assertEquals((int) reader.getEntryCount(), 4);

    try {
      Scanner scanner =
          reader.createScanner("aaa".getBytes(), "zzz".getBytes());
      Assert
          .fail("Failed to catch creating scanner with keys on unsorted file.");
    }
    catch (RuntimeException e) {
    }
    finally {
      reader.close();
    }
  }
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    }
  }

  // we still can scan records in an unsorted TFile
  public void testScan() throws IOException {
    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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    }
  }

  // we still can scan records in an unsorted TFile
  public void testScanRange() throws IOException {
    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.close();
    }
  }

  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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        final Path file = split.getPath();

        // open the file and seek to the start of the split
        FileSystem fs = file.getFileSystem(job);
        fileIn = fs.open(split.getPath());
        reader = new Reader(fileIn, fs.getFileStatus(file).getLen(), job);
        scanner = reader.createScannerByByteRange(start, split.getLength());
    }
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Related Classes of org.apache.hadoop.io.file.tfile.TFile.Reader

  • 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
  • org.apache.pig.impl.io.TFileRecordReader
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