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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.cassandra.io.compress;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Collections;
import java.util.Random;
import org.junit.Test;
import org.apache.cassandra.db.composites.SimpleDenseCellNameType;
import org.apache.cassandra.db.marshal.BytesType;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.io.sstable.CorruptSSTableException;
import org.apache.cassandra.io.sstable.metadata.MetadataCollector;
import org.apache.cassandra.io.util.FileMark;
import org.apache.cassandra.io.util.RandomAccessReader;
import org.apache.cassandra.io.util.SequentialWriter;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
public class CompressedRandomAccessReaderTest
{
@Test
public void testResetAndTruncate() throws IOException
{
// test reset in current buffer or previous one
testResetAndTruncate(File.createTempFile("normal", "1"), false, 10);
testResetAndTruncate(File.createTempFile("normal", "2"), false, CompressionParameters.DEFAULT_CHUNK_LENGTH);
}
@Test
public void testResetAndTruncateCompressed() throws IOException
{
// test reset in current buffer or previous one
testResetAndTruncate(File.createTempFile("compressed", "1"), true, 10);
testResetAndTruncate(File.createTempFile("compressed", "2"), true, CompressionParameters.DEFAULT_CHUNK_LENGTH);
}
@Test
public void test6791() throws IOException, ConfigurationException
{
File f = File.createTempFile("compressed6791_", "3");
String filename = f.getAbsolutePath();
try
{
MetadataCollector sstableMetadataCollector = new MetadataCollector(new SimpleDenseCellNameType(BytesType.instance));
CompressedSequentialWriter writer = new CompressedSequentialWriter(f, filename + ".metadata", new CompressionParameters(SnappyCompressor.instance, 32, Collections.<String, String>emptyMap()), sstableMetadataCollector);
for (int i = 0; i < 20; i++)
writer.write("x".getBytes());
FileMark mark = writer.mark();
// write enough garbage to create new chunks:
for (int i = 0; i < 40; ++i)
writer.write("y".getBytes());
writer.resetAndTruncate(mark);
for (int i = 0; i < 20; i++)
writer.write("x".getBytes());
writer.close();
CompressedRandomAccessReader reader = CompressedRandomAccessReader.open(filename, new CompressionMetadata(filename + ".metadata", f.length(), true));
String res = reader.readLine();
assertEquals(res, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
assertEquals(40, res.length());
}
finally
{
// cleanup
if (f.exists())
f.delete();
File metadata = new File(filename+ ".metadata");
if (metadata.exists())
metadata.delete();
}
}
private void testResetAndTruncate(File f, boolean compressed, int junkSize) throws IOException
{
final String filename = f.getAbsolutePath();
try
{
MetadataCollector sstableMetadataCollector = new MetadataCollector(new SimpleDenseCellNameType(BytesType.instance)).replayPosition(null);
SequentialWriter writer = compressed
? new CompressedSequentialWriter(f, filename + ".metadata", new CompressionParameters(SnappyCompressor.instance), sstableMetadataCollector)
: new SequentialWriter(f, CompressionParameters.DEFAULT_CHUNK_LENGTH);
writer.write("The quick ".getBytes());
FileMark mark = writer.mark();
writer.write("blue fox jumps over the lazy dog".getBytes());
// write enough to be sure to change chunk
for (int i = 0; i < junkSize; ++i)
{
writer.write((byte)1);
}
writer.resetAndTruncate(mark);
writer.write("brown fox jumps over the lazy dog".getBytes());
writer.close();
assert f.exists();
RandomAccessReader reader = compressed
? CompressedRandomAccessReader.open(filename, new CompressionMetadata(filename + ".metadata", f.length(), true))
: RandomAccessReader.open(f);
String expected = "The quick brown fox jumps over the lazy dog";
assertEquals(expected.length(), reader.length());
byte[] b = new byte[expected.length()];
reader.readFully(b);
assert new String(b).equals(expected) : "Expecting '" + expected + "', got '" + new String(b) + "'";
}
finally
{
// cleanup
if (f.exists())
f.delete();
File metadata = new File(filename + ".metadata");
if (compressed && metadata.exists())
metadata.delete();
}
}
@Test
public void testDataCorruptionDetection() throws IOException
{
String CONTENT = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam vitae.";
File file = new File("testDataCorruptionDetection");
file.deleteOnExit();
File metadata = new File(file.getPath() + ".meta");
metadata.deleteOnExit();
MetadataCollector sstableMetadataCollector = new MetadataCollector(new SimpleDenseCellNameType(BytesType.instance)).replayPosition(null);
SequentialWriter writer = new CompressedSequentialWriter(file, metadata.getPath(), new CompressionParameters(SnappyCompressor.instance), sstableMetadataCollector);
writer.write(CONTENT.getBytes());
writer.close();
// open compression metadata and get chunk information
CompressionMetadata meta = new CompressionMetadata(metadata.getPath(), file.length(), true);
CompressionMetadata.Chunk chunk = meta.chunkFor(0);
RandomAccessReader reader = CompressedRandomAccessReader.open(file.getPath(), meta);
// read and verify compressed data
assertEquals(CONTENT, reader.readLine());
// close reader
reader.close();
Random random = new Random();
RandomAccessFile checksumModifier = null;
try
{
checksumModifier = new RandomAccessFile(file, "rw");
byte[] checksum = new byte[4];
// seek to the end of the compressed chunk
checksumModifier.seek(chunk.length);
// read checksum bytes
checksumModifier.read(checksum);
// seek back to the chunk end
checksumModifier.seek(chunk.length);
// lets modify one byte of the checksum on each iteration
for (int i = 0; i < checksum.length; i++)
{
checksumModifier.write(random.nextInt());
checksumModifier.getFD().sync(); // making sure that change was synced with disk
final RandomAccessReader r = CompressedRandomAccessReader.open(file.getPath(), meta);
Throwable exception = null;
try
{
r.readLine();
}
catch (Throwable t)
{
exception = t;
}
assertNotNull(exception);
assertEquals(exception.getClass(), CorruptSSTableException.class);
assertEquals(exception.getCause().getClass(), CorruptBlockException.class);
r.close();
}
// lets write original checksum and check if we can read data
updateChecksum(checksumModifier, chunk.length, checksum);
reader = CompressedRandomAccessReader.open(file.getPath(), meta);
// read and verify compressed data
assertEquals(CONTENT, reader.readLine());
// close reader
reader.close();
}
finally
{
if (checksumModifier != null)
checksumModifier.close();
}
}
private void updateChecksum(RandomAccessFile file, long checksumOffset, byte[] checksum) throws IOException
{
file.seek(checksumOffset);
file.write(checksum);
file.getFD().sync();
}
}