/*
*
* 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
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*/
package org.apache.hadoop.hbase.io.hfile;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;
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.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.fs.HFileSystem;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.io.hfile.HFileBlockIndex.BlockIndexReader;
import org.apache.hadoop.hbase.io.hfile.HFileBlockIndex.BlockIndexChunk;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
@RunWith(Parameterized.class)
@Category(MediumTests.class)
public class TestHFileBlockIndex {
@Parameters
public static Collection<Object[]> compressionAlgorithms() {
return HBaseTestingUtility.COMPRESSION_ALGORITHMS_PARAMETERIZED;
}
public TestHFileBlockIndex(Compression.Algorithm compr) {
this.compr = compr;
}
private static final Log LOG = LogFactory.getLog(TestHFileBlockIndex.class);
private static final int NUM_DATA_BLOCKS = 1000;
private static final HBaseTestingUtility TEST_UTIL =
new HBaseTestingUtility();
private static final int SMALL_BLOCK_SIZE = 4096;
private static final int NUM_KV = 10000;
private static FileSystem fs;
private Path path;
private Random rand;
private long rootIndexOffset;
private int numRootEntries;
private int numLevels;
private static final List<byte[]> keys = new ArrayList<byte[]>();
private final Compression.Algorithm compr;
private byte[] firstKeyInFile;
private Configuration conf;
private static final int[] INDEX_CHUNK_SIZES = { 4096, 512, 384 };
private static final int[] EXPECTED_NUM_LEVELS = { 2, 3, 4 };
private static final int[] UNCOMPRESSED_INDEX_SIZES =
{ 19187, 21813, 23086 };
private static final boolean includesMemstoreTS = true;
static {
assert INDEX_CHUNK_SIZES.length == EXPECTED_NUM_LEVELS.length;
assert INDEX_CHUNK_SIZES.length == UNCOMPRESSED_INDEX_SIZES.length;
}
@Before
public void setUp() throws IOException {
keys.clear();
rand = new Random(2389757);
firstKeyInFile = null;
conf = TEST_UTIL.getConfiguration();
// This test requires at least HFile format version 2.
conf.setInt(HFile.FORMAT_VERSION_KEY, HFile.MAX_FORMAT_VERSION);
fs = HFileSystem.get(conf);
}
@Test
public void testBlockIndex() throws IOException {
path = new Path(TEST_UTIL.getDataTestDir(), "block_index_" + compr);
writeWholeIndex();
readIndex();
}
/**
* A wrapper around a block reader which only caches the results of the last
* operation. Not thread-safe.
*/
private static class BlockReaderWrapper implements HFile.CachingBlockReader {
private HFileBlock.FSReader realReader;
private long prevOffset;
private long prevOnDiskSize;
private boolean prevPread;
private HFileBlock prevBlock;
public int hitCount = 0;
public int missCount = 0;
public BlockReaderWrapper(HFileBlock.FSReader realReader) {
this.realReader = realReader;
}
@Override
public HFileBlock readBlock(long offset, long onDiskSize,
boolean cacheBlock, boolean pread, boolean isCompaction,
BlockType expectedBlockType)
throws IOException {
if (offset == prevOffset && onDiskSize == prevOnDiskSize &&
pread == prevPread) {
hitCount += 1;
return prevBlock;
}
missCount += 1;
prevBlock = realReader.readBlockData(offset, onDiskSize,
-1, pread);
prevOffset = offset;
prevOnDiskSize = onDiskSize;
prevPread = pread;
return prevBlock;
}
}
public void readIndex() throws IOException {
long fileSize = fs.getFileStatus(path).getLen();
LOG.info("Size of " + path + ": " + fileSize);
FSDataInputStream istream = fs.open(path);
HFileBlock.FSReader blockReader = new HFileBlock.FSReaderV2(istream,
compr, fs.getFileStatus(path).getLen());
BlockReaderWrapper brw = new BlockReaderWrapper(blockReader);
HFileBlockIndex.BlockIndexReader indexReader =
new HFileBlockIndex.BlockIndexReader(
Bytes.BYTES_RAWCOMPARATOR, numLevels, brw);
indexReader.readRootIndex(blockReader.blockRange(rootIndexOffset,
fileSize).nextBlockWithBlockType(BlockType.ROOT_INDEX), numRootEntries);
long prevOffset = -1;
int i = 0;
int expectedHitCount = 0;
int expectedMissCount = 0;
LOG.info("Total number of keys: " + keys.size());
for (byte[] key : keys) {
assertTrue(key != null);
assertTrue(indexReader != null);
HFileBlock b = indexReader.seekToDataBlock(key, 0, key.length, null,
true, true, false);
if (Bytes.BYTES_RAWCOMPARATOR.compare(key, firstKeyInFile) < 0) {
assertTrue(b == null);
++i;
continue;
}
String keyStr = "key #" + i + ", " + Bytes.toStringBinary(key);
assertTrue("seekToDataBlock failed for " + keyStr, b != null);
if (prevOffset == b.getOffset()) {
assertEquals(++expectedHitCount, brw.hitCount);
} else {
LOG.info("First key in a new block: " + keyStr + ", block offset: "
+ b.getOffset() + ")");
assertTrue(b.getOffset() > prevOffset);
assertEquals(++expectedMissCount, brw.missCount);
prevOffset = b.getOffset();
}
++i;
}
istream.close();
}
private void writeWholeIndex() throws IOException {
assertEquals(0, keys.size());
HFileBlock.Writer hbw = new HFileBlock.Writer(compr, null,
includesMemstoreTS, HFile.DEFAULT_CHECKSUM_TYPE,
HFile.DEFAULT_BYTES_PER_CHECKSUM);
FSDataOutputStream outputStream = fs.create(path);
HFileBlockIndex.BlockIndexWriter biw =
new HFileBlockIndex.BlockIndexWriter(hbw, null, null);
for (int i = 0; i < NUM_DATA_BLOCKS; ++i) {
hbw.startWriting(BlockType.DATA).write(
String.valueOf(rand.nextInt(1000)).getBytes());
long blockOffset = outputStream.getPos();
hbw.writeHeaderAndData(outputStream);
byte[] firstKey = null;
for (int j = 0; j < 16; ++j) {
byte[] k = TestHFileWriterV2.randomOrderedKey(rand, i * 16 + j);
keys.add(k);
if (j == 8)
firstKey = k;
}
assertTrue(firstKey != null);
if (firstKeyInFile == null)
firstKeyInFile = firstKey;
biw.addEntry(firstKey, blockOffset, hbw.getOnDiskSizeWithHeader());
writeInlineBlocks(hbw, outputStream, biw, false);
}
writeInlineBlocks(hbw, outputStream, biw, true);
rootIndexOffset = biw.writeIndexBlocks(outputStream);
outputStream.close();
numLevels = biw.getNumLevels();
numRootEntries = biw.getNumRootEntries();
LOG.info("Index written: numLevels=" + numLevels + ", numRootEntries=" +
numRootEntries + ", rootIndexOffset=" + rootIndexOffset);
}
private void writeInlineBlocks(HFileBlock.Writer hbw,
FSDataOutputStream outputStream, HFileBlockIndex.BlockIndexWriter biw,
boolean isClosing) throws IOException {
while (biw.shouldWriteBlock(isClosing)) {
long offset = outputStream.getPos();
biw.writeInlineBlock(hbw.startWriting(biw.getInlineBlockType()));
hbw.writeHeaderAndData(outputStream);
biw.blockWritten(offset, hbw.getOnDiskSizeWithHeader(),
hbw.getUncompressedSizeWithoutHeader());
LOG.info("Wrote an inline index block at " + offset + ", size " +
hbw.getOnDiskSizeWithHeader());
}
}
private static final long getDummyFileOffset(int i) {
return i * 185 + 379;
}
private static final int getDummyOnDiskSize(int i) {
return i * i * 37 + i * 19 + 13;
}
@Test
public void testSecondaryIndexBinarySearch() throws IOException {
int numTotalKeys = 99;
assertTrue(numTotalKeys % 2 == 1); // Ensure no one made this even.
// We only add odd-index keys into the array that we will binary-search.
int numSearchedKeys = (numTotalKeys - 1) / 2;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
dos.writeInt(numSearchedKeys);
int curAllEntriesSize = 0;
int numEntriesAdded = 0;
// Only odd-index elements of this array are used to keep the secondary
// index entries of the corresponding keys.
int secondaryIndexEntries[] = new int[numTotalKeys];
for (int i = 0; i < numTotalKeys; ++i) {
byte[] k = TestHFileWriterV2.randomOrderedKey(rand, i * 2);
keys.add(k);
String msgPrefix = "Key #" + i + " (" + Bytes.toStringBinary(k) + "): ";
StringBuilder padding = new StringBuilder();
while (msgPrefix.length() + padding.length() < 70)
padding.append(' ');
msgPrefix += padding;
if (i % 2 == 1) {
dos.writeInt(curAllEntriesSize);
secondaryIndexEntries[i] = curAllEntriesSize;
LOG.info(msgPrefix + "secondary index entry #" + ((i - 1) / 2) +
", offset " + curAllEntriesSize);
curAllEntriesSize += k.length
+ HFileBlockIndex.SECONDARY_INDEX_ENTRY_OVERHEAD;
++numEntriesAdded;
} else {
secondaryIndexEntries[i] = -1;
LOG.info(msgPrefix + "not in the searched array");
}
}
// Make sure the keys are increasing.
for (int i = 0; i < keys.size() - 1; ++i)
assertTrue(Bytes.BYTES_RAWCOMPARATOR.compare(keys.get(i),
keys.get(i + 1)) < 0);
dos.writeInt(curAllEntriesSize);
assertEquals(numSearchedKeys, numEntriesAdded);
int secondaryIndexOffset = dos.size();
assertEquals(Bytes.SIZEOF_INT * (numSearchedKeys + 2),
secondaryIndexOffset);
for (int i = 1; i <= numTotalKeys - 1; i += 2) {
assertEquals(dos.size(),
secondaryIndexOffset + secondaryIndexEntries[i]);
long dummyFileOffset = getDummyFileOffset(i);
int dummyOnDiskSize = getDummyOnDiskSize(i);
LOG.debug("Storing file offset=" + dummyFileOffset + " and onDiskSize=" +
dummyOnDiskSize + " at offset " + dos.size());
dos.writeLong(dummyFileOffset);
dos.writeInt(dummyOnDiskSize);
LOG.debug("Stored key " + ((i - 1) / 2) +" at offset " + dos.size());
dos.write(keys.get(i));
}
dos.writeInt(curAllEntriesSize);
ByteBuffer nonRootIndex = ByteBuffer.wrap(baos.toByteArray());
for (int i = 0; i < numTotalKeys; ++i) {
byte[] searchKey = keys.get(i);
byte[] arrayHoldingKey = new byte[searchKey.length +
searchKey.length / 2];
// To make things a bit more interesting, store the key we are looking
// for at a non-zero offset in a new array.
System.arraycopy(searchKey, 0, arrayHoldingKey, searchKey.length / 2,
searchKey.length);
int searchResult = BlockIndexReader.binarySearchNonRootIndex(
arrayHoldingKey, searchKey.length / 2, searchKey.length, nonRootIndex,
Bytes.BYTES_RAWCOMPARATOR);
String lookupFailureMsg = "Failed to look up key #" + i + " ("
+ Bytes.toStringBinary(searchKey) + ")";
int expectedResult;
int referenceItem;
if (i % 2 == 1) {
// This key is in the array we search as the element (i - 1) / 2. Make
// sure we find it.
expectedResult = (i - 1) / 2;
referenceItem = i;
} else {
// This key is not in the array but between two elements on the array,
// in the beginning, or in the end. The result should be the previous
// key in the searched array, or -1 for i = 0.
expectedResult = i / 2 - 1;
referenceItem = i - 1;
}
assertEquals(lookupFailureMsg, expectedResult, searchResult);
// Now test we can get the offset and the on-disk-size using a
// higher-level API function.s
boolean locateBlockResult =
(BlockIndexReader.locateNonRootIndexEntry(nonRootIndex, arrayHoldingKey,
searchKey.length / 2, searchKey.length, Bytes.BYTES_RAWCOMPARATOR) != -1);
if (i == 0) {
assertFalse(locateBlockResult);
} else {
assertTrue(locateBlockResult);
String errorMsg = "i=" + i + ", position=" + nonRootIndex.position();
assertEquals(errorMsg, getDummyFileOffset(referenceItem),
nonRootIndex.getLong());
assertEquals(errorMsg, getDummyOnDiskSize(referenceItem),
nonRootIndex.getInt());
}
}
}
@Test
public void testBlockIndexChunk() throws IOException {
BlockIndexChunk c = new BlockIndexChunk();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int N = 1000;
int[] numSubEntriesAt = new int[N];
int numSubEntries = 0;
for (int i = 0; i < N; ++i) {
baos.reset();
DataOutputStream dos = new DataOutputStream(baos);
c.writeNonRoot(dos);
assertEquals(c.getNonRootSize(), dos.size());
baos.reset();
dos = new DataOutputStream(baos);
c.writeRoot(dos);
assertEquals(c.getRootSize(), dos.size());
byte[] k = TestHFileWriterV2.randomOrderedKey(rand, i);
numSubEntries += rand.nextInt(5) + 1;
keys.add(k);
c.add(k, getDummyFileOffset(i), getDummyOnDiskSize(i), numSubEntries);
}
// Test the ability to look up the entry that contains a particular
// deeper-level index block's entry ("sub-entry"), assuming a global
// 0-based ordering of sub-entries. This is needed for mid-key calculation.
for (int i = 0; i < N; ++i) {
for (int j = i == 0 ? 0 : numSubEntriesAt[i - 1];
j < numSubEntriesAt[i];
++j) {
assertEquals(i, c.getEntryBySubEntry(j));
}
}
}
/** Checks if the HeapSize calculator is within reason */
@Test
public void testHeapSizeForBlockIndex() throws IOException {
Class<HFileBlockIndex.BlockIndexReader> cl =
HFileBlockIndex.BlockIndexReader.class;
long expected = ClassSize.estimateBase(cl, false);
HFileBlockIndex.BlockIndexReader bi =
new HFileBlockIndex.BlockIndexReader(Bytes.BYTES_RAWCOMPARATOR, 1);
long actual = bi.heapSize();
// Since the arrays in BlockIndex(byte [][] blockKeys, long [] blockOffsets,
// int [] blockDataSizes) are all null they are not going to show up in the
// HeapSize calculation, so need to remove those array costs from expected.
expected -= ClassSize.align(3 * ClassSize.ARRAY);
if (expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
}
/**
* Testing block index through the HFile writer/reader APIs. Allows to test
* setting index block size through configuration, intermediate-level index
* blocks, and caching index blocks on write.
*
* @throws IOException
*/
@Test
public void testHFileWriterAndReader() throws IOException {
Path hfilePath = new Path(TEST_UTIL.getDataTestDir(),
"hfile_for_block_index");
CacheConfig cacheConf = new CacheConfig(conf);
BlockCache blockCache = cacheConf.getBlockCache();
for (int testI = 0; testI < INDEX_CHUNK_SIZES.length; ++testI) {
int indexBlockSize = INDEX_CHUNK_SIZES[testI];
int expectedNumLevels = EXPECTED_NUM_LEVELS[testI];
LOG.info("Index block size: " + indexBlockSize + ", compression: "
+ compr);
// Evict all blocks that were cached-on-write by the previous invocation.
blockCache.evictBlocksByHfileName(hfilePath.getName());
conf.setInt(HFileBlockIndex.MAX_CHUNK_SIZE_KEY, indexBlockSize);
Set<String> keyStrSet = new HashSet<String>();
byte[][] keys = new byte[NUM_KV][];
byte[][] values = new byte[NUM_KV][];
// Write the HFile
{
HFile.Writer writer =
HFile.getWriterFactory(conf, cacheConf)
.withPath(fs, hfilePath)
.withBlockSize(SMALL_BLOCK_SIZE)
.withCompression(compr)
.withComparator(KeyValue.KEY_COMPARATOR)
.create();
Random rand = new Random(19231737);
for (int i = 0; i < NUM_KV; ++i) {
byte[] row = TestHFileWriterV2.randomOrderedKey(rand, i);
// Key will be interpreted by KeyValue.KEY_COMPARATOR
byte[] k = KeyValue.createFirstOnRow(row, 0, row.length, row, 0, 0,
row, 0, 0).getKey();
byte[] v = TestHFileWriterV2.randomValue(rand);
writer.append(k, v);
keys[i] = k;
values[i] = v;
keyStrSet.add(Bytes.toStringBinary(k));
if (i > 0) {
assertTrue(KeyValue.KEY_COMPARATOR.compare(keys[i - 1],
keys[i]) < 0);
}
}
writer.close();
}
// Read the HFile
HFile.Reader reader = HFile.createReader(fs, hfilePath, cacheConf);
assertEquals(expectedNumLevels,
reader.getTrailer().getNumDataIndexLevels());
assertTrue(Bytes.equals(keys[0], reader.getFirstKey()));
assertTrue(Bytes.equals(keys[NUM_KV - 1], reader.getLastKey()));
LOG.info("Last key: " + Bytes.toStringBinary(keys[NUM_KV - 1]));
for (boolean pread : new boolean[] { false, true }) {
HFileScanner scanner = reader.getScanner(true, pread);
for (int i = 0; i < NUM_KV; ++i) {
checkSeekTo(keys, scanner, i);
checkKeyValue("i=" + i, keys[i], values[i], scanner.getKey(),
scanner.getValue());
}
assertTrue(scanner.seekTo());
for (int i = NUM_KV - 1; i >= 0; --i) {
checkSeekTo(keys, scanner, i);
checkKeyValue("i=" + i, keys[i], values[i], scanner.getKey(),
scanner.getValue());
}
}
// Manually compute the mid-key and validate it.
HFileReaderV2 reader2 = (HFileReaderV2) reader;
HFileBlock.FSReader fsReader = reader2.getUncachedBlockReader();
HFileBlock.BlockIterator iter = fsReader.blockRange(0,
reader.getTrailer().getLoadOnOpenDataOffset());
HFileBlock block;
List<byte[]> blockKeys = new ArrayList<byte[]>();
while ((block = iter.nextBlock()) != null) {
if (block.getBlockType() != BlockType.LEAF_INDEX)
return;
ByteBuffer b = block.getBufferReadOnly();
int n = b.getInt();
// One int for the number of items, and n + 1 for the secondary index.
int entriesOffset = Bytes.SIZEOF_INT * (n + 2);
// Get all the keys from the leaf index block. S
for (int i = 0; i < n; ++i) {
int keyRelOffset = b.getInt(Bytes.SIZEOF_INT * (i + 1));
int nextKeyRelOffset = b.getInt(Bytes.SIZEOF_INT * (i + 2));
int keyLen = nextKeyRelOffset - keyRelOffset;
int keyOffset = b.arrayOffset() + entriesOffset + keyRelOffset +
HFileBlockIndex.SECONDARY_INDEX_ENTRY_OVERHEAD;
byte[] blockKey = Arrays.copyOfRange(b.array(), keyOffset, keyOffset
+ keyLen);
String blockKeyStr = Bytes.toString(blockKey);
blockKeys.add(blockKey);
// If the first key of the block is not among the keys written, we
// are not parsing the non-root index block format correctly.
assertTrue("Invalid block key from leaf-level block: " + blockKeyStr,
keyStrSet.contains(blockKeyStr));
}
}
// Validate the mid-key.
assertEquals(
Bytes.toStringBinary(blockKeys.get((blockKeys.size() - 1) / 2)),
Bytes.toStringBinary(reader.midkey()));
assertEquals(UNCOMPRESSED_INDEX_SIZES[testI],
reader.getTrailer().getUncompressedDataIndexSize());
reader.close();
reader2.close();
}
}
private void checkSeekTo(byte[][] keys, HFileScanner scanner, int i)
throws IOException {
assertEquals("Failed to seek to key #" + i + " ("
+ Bytes.toStringBinary(keys[i]) + ")", 0, scanner.seekTo(keys[i]));
}
private void assertArrayEqualsBuffer(String msgPrefix, byte[] arr,
ByteBuffer buf) {
assertEquals(msgPrefix + ": expected " + Bytes.toStringBinary(arr)
+ ", actual " + Bytes.toStringBinary(buf), 0, Bytes.compareTo(arr, 0,
arr.length, buf.array(), buf.arrayOffset(), buf.limit()));
}
/** Check a key/value pair after it was read by the reader */
private void checkKeyValue(String msgPrefix, byte[] expectedKey,
byte[] expectedValue, ByteBuffer keyRead, ByteBuffer valueRead) {
if (!msgPrefix.isEmpty())
msgPrefix += ". ";
assertArrayEqualsBuffer(msgPrefix + "Invalid key", expectedKey, keyRead);
assertArrayEqualsBuffer(msgPrefix + "Invalid value", expectedValue,
valueRead);
}
}