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18 package org.apache.hadoop.hbase.io.hfile;
19
20 import static org.junit.Assert.*;
21
22 import java.io.IOException;
23 import java.util.Random;
24
25 import org.apache.hadoop.conf.Configuration;
26 import org.apache.hadoop.fs.FileSystem;
27 import org.apache.hadoop.fs.Path;
28 import org.apache.hadoop.hbase.HBaseTestingUtility;
29 import org.apache.hadoop.hbase.KeyValue;
30 import org.apache.hadoop.hbase.testclassification.SmallTests;
31 import org.apache.hadoop.hbase.fs.HFileSystem;
32 import org.apache.hadoop.hbase.regionserver.StoreFile;
33
34 import org.junit.Before;
35 import org.junit.Test;
36 import org.junit.experimental.categories.Category;
37
38 @Category(SmallTests.class)
39 public class TestPrefetch {
40
41 private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
42
43 private static final int NUM_VALID_KEY_TYPES = KeyValue.Type.values().length - 2;
44 private static final int DATA_BLOCK_SIZE = 2048;
45 private static final int NUM_KV = 1000;
46 private static final Random RNG = new Random();
47
48 private Configuration conf;
49 private CacheConfig cacheConf;
50 private FileSystem fs;
51
52 @Before
53 public void setUp() throws IOException {
54 conf = TEST_UTIL.getConfiguration();
55 conf.setInt(HFile.FORMAT_VERSION_KEY, 3);
56 conf.setBoolean(CacheConfig.PREFETCH_BLOCKS_ON_OPEN_KEY, true);
57 fs = HFileSystem.get(conf);
58 CacheConfig.blockCacheDisabled = false;
59 cacheConf = new CacheConfig(conf);
60 }
61
62 @Test(timeout=60000)
63 public void testPrefetch() throws Exception {
64 Path storeFile = writeStoreFile();
65 readStoreFile(storeFile);
66 }
67
68 private void readStoreFile(Path storeFilePath) throws Exception {
69
70 HFileReaderV2 reader = (HFileReaderV2) HFile.createReader(fs,
71 storeFilePath, cacheConf, conf);
72
73 while (!((HFileReaderV3)reader).prefetchComplete()) {
74
75 Thread.sleep(1000);
76 }
77
78
79 BlockCache blockCache = cacheConf.getBlockCache();
80 long offset = 0;
81 HFileBlock prevBlock = null;
82 while (offset < reader.getTrailer().getLoadOnOpenDataOffset()) {
83 long onDiskSize = -1;
84 if (prevBlock != null) {
85 onDiskSize = prevBlock.getNextBlockOnDiskSizeWithHeader();
86 }
87 HFileBlock block = reader.readBlock(offset, onDiskSize, false, true, false, true, null,
88 null);
89 BlockCacheKey blockCacheKey = new BlockCacheKey(reader.getName(), offset);
90 boolean isCached = blockCache.getBlock(blockCacheKey, true, false, true) != null;
91 if (block.getBlockType() == BlockType.DATA ||
92 block.getBlockType() == BlockType.ROOT_INDEX ||
93 block.getBlockType() == BlockType.INTERMEDIATE_INDEX) {
94 assertTrue(isCached);
95 }
96 prevBlock = block;
97 offset += block.getOnDiskSizeWithHeader();
98 }
99 }
100
101 private Path writeStoreFile() throws IOException {
102 Path storeFileParentDir = new Path(TEST_UTIL.getDataTestDir(), "TestPrefetch");
103 HFileContext meta = new HFileContextBuilder()
104 .withBlockSize(DATA_BLOCK_SIZE)
105 .build();
106 StoreFile.Writer sfw = new StoreFile.WriterBuilder(conf, cacheConf, fs)
107 .withOutputDir(storeFileParentDir)
108 .withComparator(KeyValue.COMPARATOR)
109 .withFileContext(meta)
110 .build();
111
112 final int rowLen = 32;
113 for (int i = 0; i < NUM_KV; ++i) {
114 byte[] k = TestHFileWriterV2.randomOrderedKey(RNG, i);
115 byte[] v = TestHFileWriterV2.randomValue(RNG);
116 int cfLen = RNG.nextInt(k.length - rowLen + 1);
117 KeyValue kv = new KeyValue(
118 k, 0, rowLen,
119 k, rowLen, cfLen,
120 k, rowLen + cfLen, k.length - rowLen - cfLen,
121 RNG.nextLong(),
122 generateKeyType(RNG),
123 v, 0, v.length);
124 sfw.append(kv);
125 }
126
127 sfw.close();
128 return sfw.getPath();
129 }
130
131 public static KeyValue.Type generateKeyType(Random rand) {
132 if (rand.nextBoolean()) {
133
134 return KeyValue.Type.Put;
135 } else {
136 KeyValue.Type keyType =
137 KeyValue.Type.values()[1 + rand.nextInt(NUM_VALID_KEY_TYPES)];
138 if (keyType == KeyValue.Type.Minimum || keyType == KeyValue.Type.Maximum)
139 {
140 throw new RuntimeException("Generated an invalid key type: " + keyType
141 + ". " + "Probably the layout of KeyValue.Type has changed.");
142 }
143 return keyType;
144 }
145 }
146
147 }