/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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 under the License.
*/
package org.apache.hadoop.hbase.io.hfile;
import static org.junit.Assert.*;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
import org.apache.hadoop.hbase.io.hfile.HFile.FileInfo;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.RawComparator;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.WritableUtils;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Testing writing a version 2 {@link HFile}. This is a low-level test written
* during the development of {@link HFileWriterV2}.
*/
@Category(SmallTests.class)
public class TestHFileWriterV2 {
private static final Log LOG = LogFactory.getLog(TestHFileWriterV2.class);
private static final HBaseTestingUtility TEST_UTIL =
new HBaseTestingUtility();
private Configuration conf;
private FileSystem fs;
@Before
public void setUp() throws IOException {
conf = TEST_UTIL.getConfiguration();
fs = FileSystem.get(conf);
}
@Test
public void testHFileFormatV2() throws IOException {
Path hfilePath = new Path(TEST_UTIL.getDataTestDir(),
"testHFileFormatV2");
final Compression.Algorithm compressAlgo = Compression.Algorithm.GZ;
final int entryCount = 10000;
writeDataAndReadFromHFile(hfilePath, compressAlgo, entryCount, false);
}
@Test
public void testMidKeyInHFile() throws IOException{
Path hfilePath = new Path(TEST_UTIL.getDataTestDir(),
"testMidKeyInHFile");
Compression.Algorithm compressAlgo = Compression.Algorithm.NONE;
int entryCount = 50000;
writeDataAndReadFromHFile(hfilePath, compressAlgo, entryCount, true);
}
private void writeDataAndReadFromHFile(Path hfilePath,
Algorithm compressAlgo, int entryCount, boolean findMidKey) throws IOException {
HFileWriterV2 writer = (HFileWriterV2)
new HFileWriterV2.WriterFactoryV2(conf, new CacheConfig(conf))
.withPath(fs, hfilePath)
.withBlockSize(4096)
.withCompression(compressAlgo)
.withComparator(KeyValue.KEY_COMPARATOR)
.create();
long totalKeyLength = 0;
long totalValueLength = 0;
Random rand = new Random(9713312); // Just a fixed seed.
List<byte[]> keys = new ArrayList<byte[]>();
List<byte[]> values = new ArrayList<byte[]>();
for (int i = 0; i < entryCount; ++i) {
byte[] keyBytes = randomOrderedKey(rand, i);
// A random-length random value.
byte[] valueBytes = randomValue(rand);
writer.append(keyBytes, valueBytes);
totalKeyLength += keyBytes.length;
totalValueLength += valueBytes.length;
keys.add(keyBytes);
values.add(valueBytes);
}
// Add in an arbitrary order. They will be sorted lexicographically by
// the key.
writer.appendMetaBlock("CAPITAL_OF_USA", new Text("Washington, D.C."));
writer.appendMetaBlock("CAPITAL_OF_RUSSIA", new Text("Moscow"));
writer.appendMetaBlock("CAPITAL_OF_FRANCE", new Text("Paris"));
writer.close();
FSDataInputStream fsdis = fs.open(hfilePath);
// A "manual" version of a new-format HFile reader. This unit test was
// written before the V2 reader was fully implemented.
long fileSize = fs.getFileStatus(hfilePath).getLen();
FixedFileTrailer trailer =
FixedFileTrailer.readFromStream(fsdis, fileSize);
assertEquals(2, trailer.getMajorVersion());
assertEquals(entryCount, trailer.getEntryCount());
HFileBlock.FSReader blockReader =
new HFileBlock.FSReaderV2(fsdis, compressAlgo, fileSize);
// Comparator class name is stored in the trailer in version 2.
RawComparator<byte []> comparator = trailer.createComparator();
HFileBlockIndex.BlockIndexReader dataBlockIndexReader =
new HFileBlockIndex.BlockIndexReader(comparator,
trailer.getNumDataIndexLevels());
HFileBlockIndex.BlockIndexReader metaBlockIndexReader =
new HFileBlockIndex.BlockIndexReader(
Bytes.BYTES_RAWCOMPARATOR, 1);
HFileBlock.BlockIterator blockIter = blockReader.blockRange(
trailer.getLoadOnOpenDataOffset(),
fileSize - trailer.getTrailerSize());
// Data index. We also read statistics about the block index written after
// the root level.
dataBlockIndexReader.readMultiLevelIndexRoot(
blockIter.nextBlockWithBlockType(BlockType.ROOT_INDEX),
trailer.getDataIndexCount());
if (findMidKey) {
byte[] midkey = dataBlockIndexReader.midkey();
assertNotNull("Midkey should not be null", midkey);
}
// Meta index.
metaBlockIndexReader.readRootIndex(
blockIter.nextBlockWithBlockType(BlockType.ROOT_INDEX).getByteStream(),
trailer.getMetaIndexCount());
// File info
FileInfo fileInfo = new FileInfo();
fileInfo.readFields(blockIter.nextBlockWithBlockType(BlockType.FILE_INFO).getByteStream());
byte [] keyValueFormatVersion = fileInfo.get(
HFileWriterV2.KEY_VALUE_VERSION);
boolean includeMemstoreTS = keyValueFormatVersion != null &&
Bytes.toInt(keyValueFormatVersion) > 0;
// Counters for the number of key/value pairs and the number of blocks
int entriesRead = 0;
int blocksRead = 0;
long memstoreTS = 0;
// Scan blocks the way the reader would scan them
fsdis.seek(0);
long curBlockPos = 0;
while (curBlockPos <= trailer.getLastDataBlockOffset()) {
HFileBlock block = blockReader.readBlockData(curBlockPos, -1, -1, false);
assertEquals(BlockType.DATA, block.getBlockType());
ByteBuffer buf = block.getBufferWithoutHeader();
while (buf.hasRemaining()) {
int keyLen = buf.getInt();
int valueLen = buf.getInt();
byte[] key = new byte[keyLen];
buf.get(key);
byte[] value = new byte[valueLen];
buf.get(value);
if (includeMemstoreTS) {
ByteArrayInputStream byte_input = new ByteArrayInputStream(buf.array(),
buf.arrayOffset() + buf.position(), buf.remaining());
DataInputStream data_input = new DataInputStream(byte_input);
memstoreTS = WritableUtils.readVLong(data_input);
buf.position(buf.position() + WritableUtils.getVIntSize(memstoreTS));
}
// A brute-force check to see that all keys and values are correct.
assertTrue(Bytes.compareTo(key, keys.get(entriesRead)) == 0);
assertTrue(Bytes.compareTo(value, values.get(entriesRead)) == 0);
++entriesRead;
}
++blocksRead;
curBlockPos += block.getOnDiskSizeWithHeader();
}
LOG.info("Finished reading: entries=" + entriesRead + ", blocksRead="
+ blocksRead);
assertEquals(entryCount, entriesRead);
// Meta blocks. We can scan until the load-on-open data offset (which is
// the root block index offset in version 2) because we are not testing
// intermediate-level index blocks here.
int metaCounter = 0;
while (fsdis.getPos() < trailer.getLoadOnOpenDataOffset()) {
LOG.info("Current offset: " + fsdis.getPos() + ", scanning until " +
trailer.getLoadOnOpenDataOffset());
HFileBlock block = blockReader.readBlockData(curBlockPos, -1, -1, false);
assertEquals(BlockType.META, block.getBlockType());
Text t = new Text();
block.readInto(t);
Text expectedText =
(metaCounter == 0 ? new Text("Paris") : metaCounter == 1 ? new Text(
"Moscow") : new Text("Washington, D.C."));
assertEquals(expectedText, t);
LOG.info("Read meta block data: " + t);
++metaCounter;
curBlockPos += block.getOnDiskSizeWithHeader();
}
fsdis.close();
}
// Static stuff used by various HFile v2 unit tests
private static final String COLUMN_FAMILY_NAME = "_-myColumnFamily-_";
private static final int MIN_ROW_OR_QUALIFIER_LENGTH = 64;
private static final int MAX_ROW_OR_QUALIFIER_LENGTH = 128;
/**
* Generates a random key that is guaranteed to increase as the given index i
* increases. The result consists of a prefix, which is a deterministic
* increasing function of i, and a random suffix.
*
* @param rand
* random number generator to use
* @param i
* @return
*/
public static byte[] randomOrderedKey(Random rand, int i) {
StringBuilder k = new StringBuilder();
// The fixed-length lexicographically increasing part of the key.
for (int bitIndex = 31; bitIndex >= 0; --bitIndex) {
if ((i & (1 << bitIndex)) == 0)
k.append("a");
else
k.append("b");
}
// A random-length random suffix of the key.
for (int j = 0; j < rand.nextInt(50); ++j)
k.append(randomReadableChar(rand));
byte[] keyBytes = k.toString().getBytes();
return keyBytes;
}
public static byte[] randomValue(Random rand) {
StringBuilder v = new StringBuilder();
for (int j = 0; j < 1 + rand.nextInt(2000); ++j) {
v.append((char) (32 + rand.nextInt(95)));
}
byte[] valueBytes = v.toString().getBytes();
return valueBytes;
}
public static final char randomReadableChar(Random rand) {
int i = rand.nextInt(26 * 2 + 10 + 1);
if (i < 26)
return (char) ('A' + i);
i -= 26;
if (i < 26)
return (char) ('a' + i);
i -= 26;
if (i < 10)
return (char) ('0' + i);
i -= 10;
assert i == 0;
return '_';
}
public static byte[] randomRowOrQualifier(Random rand) {
StringBuilder field = new StringBuilder();
int fieldLen = MIN_ROW_OR_QUALIFIER_LENGTH
+ rand.nextInt(MAX_ROW_OR_QUALIFIER_LENGTH
- MIN_ROW_OR_QUALIFIER_LENGTH + 1);
for (int i = 0; i < fieldLen; ++i)
field.append(randomReadableChar(rand));
return field.toString().getBytes();
}
public static KeyValue randomKeyValue(Random rand) {
return new KeyValue(randomRowOrQualifier(rand),
COLUMN_FAMILY_NAME.getBytes(), randomRowOrQualifier(rand),
randomValue(rand));
}
}