Example #1
0
  /**
   * Using the given {@code appender}'s {@link Appender#append(LogSegment, ByteBuffer)} function,
   * tests for various cases for append operations.
   *
   * @param appender the {@link Appender} to use
   * @throws IOException
   */
  private void doAppendTest(Appender appender) throws IOException {
    String currSegmentName = "log_current";
    LogSegment segment = getSegment(currSegmentName, STANDARD_SEGMENT_SIZE, true);
    try {
      long writeStartOffset = segment.getStartOffset();
      byte[] bufOne = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 2);
      byte[] bufTwo = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 3);

      appender.append(segment, ByteBuffer.wrap(bufOne));
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + bufOne.length,
          segment.getEndOffset());

      appender.append(segment, ByteBuffer.wrap(bufTwo));
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + bufOne.length + bufTwo.length,
          segment.getEndOffset());

      // try to do a write that won't fit
      ByteBuffer failBuf =
          ByteBuffer.wrap(
              TestUtils.getRandomBytes((int) (STANDARD_SEGMENT_SIZE - writeStartOffset + 1)));
      long writeOverFlowCount = metrics.overflowWriteError.getCount();
      try {
        appender.append(segment, failBuf);
        fail("Append should have failed because data won't fit in the segment");
      } catch (IllegalArgumentException e) {
        assertEquals(
            "Write overflow should have been reported",
            writeOverFlowCount + 1,
            metrics.overflowWriteError.getCount());
        assertEquals("Position of buffer has changed", 0, failBuf.position());
      }

      // read and ensure data matches
      readAndEnsureMatch(segment, writeStartOffset, bufOne);
      readAndEnsureMatch(segment, writeStartOffset + bufOne.length, bufTwo);

      segment.close();
      // ensure that append fails.
      ByteBuffer buffer = ByteBuffer.wrap(TestUtils.getRandomBytes(1));
      try {
        appender.append(segment, buffer);
        fail("Append should have failed because segments are closed");
      } catch (ClosedChannelException e) {
        assertEquals("Position of buffer has changed", 0, buffer.position());
      }
    } finally {
      closeSegmentAndDeleteFile(segment);
    }
  }
Example #2
0
  /**
   * Tests appending and reading to make sure data is written and the data read is consistent with
   * the data written.
   *
   * @throws IOException
   */
  @Test
  public void basicWriteAndReadTest() throws IOException {
    String segmentName = "log_current";
    LogSegment segment = getSegment(segmentName, STANDARD_SEGMENT_SIZE, true);
    try {
      assertEquals(
          "Name of segment is inconsistent with what was provided", segmentName, segment.getName());
      assertEquals(
          "Capacity of segment is inconsistent with what was provided",
          STANDARD_SEGMENT_SIZE,
          segment.getCapacityInBytes());
      assertEquals(
          "Start offset is not equal to header size",
          LogSegment.HEADER_SIZE,
          segment.getStartOffset());
      int writeSize = 100;
      byte[] buf = TestUtils.getRandomBytes(3 * writeSize);
      long writeStartOffset = segment.getStartOffset();
      // append with buffer
      int written = segment.appendFrom(ByteBuffer.wrap(buf, 0, writeSize));
      assertEquals("Size written did not match size of buffer provided", writeSize, written);
      assertEquals(
          "End offset is not as expected", writeStartOffset + writeSize, segment.getEndOffset());
      readAndEnsureMatch(segment, writeStartOffset, Arrays.copyOfRange(buf, 0, writeSize));

      // append with channel
      segment.appendFrom(
          Channels.newChannel(
              new ByteBufferInputStream(ByteBuffer.wrap(buf, writeSize, writeSize))),
          writeSize);
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + 2 * writeSize,
          segment.getEndOffset());
      readAndEnsureMatch(
          segment, writeStartOffset + writeSize, Arrays.copyOfRange(buf, writeSize, 2 * writeSize));

      // use writeFrom
      segment.writeFrom(
          Channels.newChannel(
              new ByteBufferInputStream(ByteBuffer.wrap(buf, 2 * writeSize, writeSize))),
          segment.getEndOffset(),
          writeSize);
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + 3 * writeSize,
          segment.getEndOffset());
      readAndEnsureMatch(
          segment,
          writeStartOffset + 2 * writeSize,
          Arrays.copyOfRange(buf, 2 * writeSize, buf.length));

      readAndEnsureMatch(segment, writeStartOffset, buf);
      // check file size and end offset (they will not match)
      assertEquals(
          "End offset is not equal to the cumulative bytes written",
          writeStartOffset + 3 * writeSize,
          segment.getEndOffset());
      assertEquals(
          "Size in bytes is not equal to size of the file",
          STANDARD_SEGMENT_SIZE,
          segment.sizeInBytes());

      // ensure flush doesn't throw any errors.
      segment.flush();
      // close and reopen segment and ensure persistence.
      segment.close();
      segment = new LogSegment(segmentName, new File(tempDir, segmentName), metrics);
      segment.setEndOffset(writeStartOffset + buf.length);
      readAndEnsureMatch(segment, writeStartOffset, buf);
    } finally {
      closeSegmentAndDeleteFile(segment);
    }
  }
Example #3
0
  /**
   * Tests {@link LogSegment#writeFrom(ReadableByteChannel, long, long)} for various cases.
   *
   * @throws IOException
   */
  @Test
  public void writeFromTest() throws IOException {
    String currSegmentName = "log_current";
    LogSegment segment = getSegment(currSegmentName, STANDARD_SEGMENT_SIZE, true);
    try {
      long writeStartOffset = segment.getStartOffset();
      byte[] bufOne = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 3);
      byte[] bufTwo = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 2);

      segment.writeFrom(
          Channels.newChannel(new ByteBufferInputStream(ByteBuffer.wrap(bufOne))),
          writeStartOffset,
          bufOne.length);
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + bufOne.length,
          segment.getEndOffset());
      readAndEnsureMatch(segment, writeStartOffset, bufOne);

      // overwrite using bufTwo
      segment.writeFrom(
          Channels.newChannel(new ByteBufferInputStream(ByteBuffer.wrap(bufTwo))),
          writeStartOffset,
          bufTwo.length);
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + bufTwo.length,
          segment.getEndOffset());
      readAndEnsureMatch(segment, writeStartOffset, bufTwo);

      // overwrite using bufOne
      segment.writeFrom(
          Channels.newChannel(new ByteBufferInputStream(ByteBuffer.wrap(bufOne))),
          writeStartOffset,
          bufOne.length);
      // end offset should not have changed
      assertEquals(
          "End offset is not as expected",
          writeStartOffset + bufTwo.length,
          segment.getEndOffset());
      readAndEnsureMatch(segment, writeStartOffset, bufOne);
      readAndEnsureMatch(
          segment,
          writeStartOffset + bufOne.length,
          Arrays.copyOfRange(bufTwo, bufOne.length, bufTwo.length));

      // write at random locations
      for (int i = 0; i < 10; i++) {
        long offset =
            writeStartOffset
                + Utils.getRandomLong(
                    TestUtils.RANDOM,
                    segment.getCapacityInBytes() - bufOne.length - writeStartOffset);
        segment.writeFrom(
            Channels.newChannel(new ByteBufferInputStream(ByteBuffer.wrap(bufOne))),
            offset,
            bufOne.length);
        readAndEnsureMatch(segment, offset, bufOne);
      }

      // try to overwrite using a channel that won't fit
      ByteBuffer failBuf =
          ByteBuffer.wrap(
              TestUtils.getRandomBytes((int) (STANDARD_SEGMENT_SIZE - writeStartOffset + 1)));
      long writeOverFlowCount = metrics.overflowWriteError.getCount();
      try {
        segment.writeFrom(
            Channels.newChannel(new ByteBufferInputStream(failBuf)),
            writeStartOffset,
            failBuf.remaining());
        fail("WriteFrom should have failed because data won't fit");
      } catch (IndexOutOfBoundsException e) {
        assertEquals(
            "Write overflow should have been reported",
            writeOverFlowCount + 1,
            metrics.overflowWriteError.getCount());
        assertEquals("Position of buffer has changed", 0, failBuf.position());
      }

      // data cannot be written at invalid offsets.
      long[] invalidOffsets = {
        writeStartOffset - 1, STANDARD_SEGMENT_SIZE, STANDARD_SEGMENT_SIZE + 1
      };
      ByteBuffer buffer = ByteBuffer.wrap(TestUtils.getRandomBytes(1));
      for (long invalidOffset : invalidOffsets) {
        try {
          segment.writeFrom(
              Channels.newChannel(new ByteBufferInputStream(buffer)),
              invalidOffset,
              buffer.remaining());
          fail("WriteFrom should have failed because offset provided for write is invalid");
        } catch (IndexOutOfBoundsException e) {
          assertEquals("Position of buffer has changed", 0, buffer.position());
        }
      }

      segment.close();
      // ensure that writeFrom fails.
      try {
        segment.writeFrom(
            Channels.newChannel(new ByteBufferInputStream(buffer)),
            writeStartOffset,
            buffer.remaining());
        fail("WriteFrom should have failed because segments are closed");
      } catch (ClosedChannelException e) {
        assertEquals("Position of buffer has changed", 0, buffer.position());
      }
    } finally {
      closeSegmentAndDeleteFile(segment);
    }
  }
Example #4
0
 /**
  * Appends random data of size {@code size} to given {@code segment}.
  *
  * @param segment the {@link LogSegment} to append data to.
  * @param size the size of the data that should be appended.
  * @return the data that was appended.
  * @throws IOException
  */
 private byte[] appendRandomData(LogSegment segment, int size) throws IOException {
   byte[] buf = TestUtils.getRandomBytes(size);
   segment.appendFrom(ByteBuffer.wrap(buf));
   return buf;
 }
Example #5
0
  /**
   * Tests {@link LogSegment#readInto(ByteBuffer, long)} for various cases.
   *
   * @throws IOException
   */
  @Test
  public void readTest() throws IOException {
    Random random = new Random();
    String segmentName = "log_current";
    LogSegment segment = getSegment(segmentName, STANDARD_SEGMENT_SIZE, true);
    try {
      long writeStartOffset = segment.getStartOffset();
      byte[] data = appendRandomData(segment, 2 * STANDARD_SEGMENT_SIZE / 3);
      readAndEnsureMatch(segment, writeStartOffset, data);
      int readCount = 10;
      for (int i = 0; i < readCount; i++) {
        int position = random.nextInt(data.length);
        int size = random.nextInt(data.length - position);
        readAndEnsureMatch(
            segment,
            writeStartOffset + position,
            Arrays.copyOfRange(data, position, position + size));
      }

      // error scenarios
      ByteBuffer readBuf = ByteBuffer.wrap(new byte[data.length]);
      // data cannot be read at invalid offsets.
      long[] invalidOffsets = {
        writeStartOffset - 1, segment.getEndOffset(), segment.getEndOffset() + 1
      };
      ByteBuffer buffer = ByteBuffer.wrap(TestUtils.getRandomBytes(1));
      for (long invalidOffset : invalidOffsets) {
        try {
          segment.readInto(readBuf, invalidOffset);
          fail("Should have failed to read because position provided is invalid");
        } catch (IndexOutOfBoundsException e) {
          assertEquals("Position of buffer has changed", 0, buffer.position());
        }
      }

      // position + buffer.remaining() > endOffset.
      long readOverFlowCount = metrics.overflowReadError.getCount();
      try {
        segment.readInto(readBuf, writeStartOffset + 1);
        fail("Should have failed to read because position + buffer.remaining() > endOffset");
      } catch (IndexOutOfBoundsException e) {
        assertEquals(
            "Read overflow should have been reported",
            readOverFlowCount + 1,
            metrics.overflowReadError.getCount());
        assertEquals("Position of buffer has changed", 0, readBuf.position());
      }

      segment.close();
      // read after close
      buffer = ByteBuffer.allocate(1);
      try {
        segment.readInto(buffer, writeStartOffset);
        fail("Should have failed to read because segment is closed");
      } catch (ClosedChannelException e) {
        assertEquals("Position of buffer has changed", 0, buffer.position());
      }
    } finally {
      closeSegmentAndDeleteFile(segment);
    }
  }