Examples of org.apache.hadoop.fs.FSDataInputStream.readFully()

Class org.apache.hadoop.fs.FSDataInputStream

Examples of org.apache.hadoop.fs.FSDataInputStream.readFully()

org.apache.hadoop.fs.FSDataInputStream.readFully()
Read bytes from the given position in the stream to the given buffer. Continues to read until length bytes have been read. @param position position in the input stream to seek @param buffer buffer into which data is read @param offset offset into the buffer in which data is written @param length the number of bytes to read @throws EOFException If the end of stream is reached while reading.If an exception is thrown an undetermined number of bytes in the buffer may have been written.

    stm.readFully(blockSize - 2048, actual);
    checkAndEraseData(actual, (int)(blockSize-2048), expected, "Pread Test 4");
    // now see if we can cross two block boundaries that are not cached
    // read blockSize + 4K bytes from 10*blockSize - 2K offset
    actual = new byte[(int)(blockSize+4096)];
    stm.readFully(10*blockSize - 2048, actual);
    checkAndEraseData(actual, (int)(10*blockSize-2048), expected, "Pread Test 5");
    // now check that even after all these preads, we can still read
    // bytes 8K-12K
    actual = new byte[4096];
    stm.readFully(actual);

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    stm.readFully(10*blockSize - 2048, actual);
    checkAndEraseData(actual, (int)(10*blockSize-2048), expected, "Pread Test 5");
    // now check that even after all these preads, we can still read
    // bytes 8K-12K
    actual = new byte[4096];
    stm.readFully(actual);
    checkAndEraseData(actual, 8192, expected, "Pread Test 6");
    // done
    stm.close();
    // check block location caching
    stm = fileSys.open(name);

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    checkAndEraseData(actual, 8192, expected, "Pread Test 6");
    // done
    stm.close();
    // check block location caching
    stm = fileSys.open(name);
    stm.readFully(1, actual, 0, 4096);
    stm.readFully(4*blockSize, actual, 0, 4096);
    stm.readFully(7*blockSize, actual, 0, 4096);
    actual = new byte[3*4096];
    stm.readFully(0*blockSize, actual, 0, 3*4096);
    checkAndEraseData(actual, 0, expected, "Pread Test 7");

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    // done
    stm.close();
    // check block location caching
    stm = fileSys.open(name);
    stm.readFully(1, actual, 0, 4096);
    stm.readFully(4*blockSize, actual, 0, 4096);
    stm.readFully(7*blockSize, actual, 0, 4096);
    actual = new byte[3*4096];
    stm.readFully(0*blockSize, actual, 0, 3*4096);
    checkAndEraseData(actual, 0, expected, "Pread Test 7");
    actual = new byte[8*4096];

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    stm.close();
    // check block location caching
    stm = fileSys.open(name);
    stm.readFully(1, actual, 0, 4096);
    stm.readFully(4*blockSize, actual, 0, 4096);
    stm.readFully(7*blockSize, actual, 0, 4096);
    actual = new byte[3*4096];
    stm.readFully(0*blockSize, actual, 0, 3*4096);
    checkAndEraseData(actual, 0, expected, "Pread Test 7");
    actual = new byte[8*4096];
    stm.readFully(3*blockSize, actual, 0, 8*4096);

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    stm = fileSys.open(name);
    stm.readFully(1, actual, 0, 4096);
    stm.readFully(4*blockSize, actual, 0, 4096);
    stm.readFully(7*blockSize, actual, 0, 4096);
    actual = new byte[3*4096];
    stm.readFully(0*blockSize, actual, 0, 3*4096);
    checkAndEraseData(actual, 0, expected, "Pread Test 7");
    actual = new byte[8*4096];
    stm.readFully(3*blockSize, actual, 0, 8*4096);
    checkAndEraseData(actual, 3*blockSize, expected, "Pread Test 8");
    // read the tail

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    stm.readFully(7*blockSize, actual, 0, 4096);
    actual = new byte[3*4096];
    stm.readFully(0*blockSize, actual, 0, 3*4096);
    checkAndEraseData(actual, 0, expected, "Pread Test 7");
    actual = new byte[8*4096];
    stm.readFully(3*blockSize, actual, 0, 8*4096);
    checkAndEraseData(actual, 3*blockSize, expected, "Pread Test 8");
    // read the tail
    stm.readFully(11*blockSize+blockSize/2, actual, 0, blockSize/2);
    IOException res = null;
    try { // read beyond the end of the file

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    checkAndEraseData(actual, 0, expected, "Pread Test 7");
    actual = new byte[8*4096];
    stm.readFully(3*blockSize, actual, 0, 8*4096);
    checkAndEraseData(actual, 3*blockSize, expected, "Pread Test 8");
    // read the tail
    stm.readFully(11*blockSize+blockSize/2, actual, 0, blockSize/2);
    IOException res = null;
    try { // read beyond the end of the file
      stm.readFully(11*blockSize+blockSize/2, actual, 0, blockSize);
    } catch (IOException e) {
      // should throw an exception

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    checkAndEraseData(actual, 3*blockSize, expected, "Pread Test 8");
    // read the tail
    stm.readFully(11*blockSize+blockSize/2, actual, 0, blockSize/2);
    IOException res = null;
    try { // read beyond the end of the file
      stm.readFully(11*blockSize+blockSize/2, actual, 0, blockSize);
    } catch (IOException e) {
      // should throw an exception
      res = e;
    }
    assertTrue("Error reading beyond file boundary.", res != null);

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    byte[] expected = new byte[numBlocks * blockSize];
    Random rand = new Random(seed);
    rand.nextBytes(expected);
    // do a sanity check. Read the file
    byte[] actual = new byte[numBlocks * blockSize];
    stm.readFully(0, actual);
    checkData(actual, 0, expected, "Read 1");
  }


  private void checkData(byte[] actual, int from, byte[] expected, String message) {
    for (int idx = 0; idx < actual.length; idx++) {

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