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20 package org.apache.hadoop.hbase.util;
21
22 import static org.junit.Assert.assertTrue;
23
24 import java.io.IOException;
25 import java.util.List;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.hadoop.conf.Configuration;
30 import org.apache.hadoop.fs.FileSystem;
31 import org.apache.hadoop.fs.Path;
32 import org.apache.hadoop.hbase.HBaseTestingUtility;
33 import org.apache.hadoop.hbase.HColumnDescriptor;
34 import org.apache.hadoop.hbase.HRegionInfo;
35 import org.apache.hadoop.hbase.HTableDescriptor;
36 import org.apache.hadoop.hbase.catalog.CatalogTracker;
37 import org.apache.hadoop.hbase.catalog.MetaReader;
38 import org.apache.hadoop.hbase.client.HBaseAdmin;
39 import org.apache.hadoop.hbase.client.Put;
40 import org.apache.hadoop.hbase.regionserver.HRegion;
41 import org.junit.Test;
42
43
44
45
46 public class TestMergeTable {
47 private static final Log LOG = LogFactory.getLog(TestMergeTable.class);
48 private final HBaseTestingUtility UTIL = new HBaseTestingUtility();
49 private static final byte [] COLUMN_NAME = Bytes.toBytes("contents");
50 private static final byte [] VALUE;
51 static {
52
53 String partialValue = String.valueOf(System.currentTimeMillis());
54 StringBuilder val = new StringBuilder();
55 while (val.length() < 1024) {
56 val.append(partialValue);
57 }
58 VALUE = Bytes.toBytes(val.toString());
59 }
60
61
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64
65
66
67
68 @Test (timeout=300000) public void testMergeTable() throws Exception {
69
70 HTableDescriptor desc = new HTableDescriptor(Bytes.toBytes("test"));
71 desc.addFamily(new HColumnDescriptor(COLUMN_NAME));
72
73
74 UTIL.getConfiguration().setLong("hbase.hregion.max.filesize", 64L * 1024L * 1024L);
75
76 UTIL.getConfiguration().setInt("hbase.regionserver.regionSplitLimit", 0);
77
78 UTIL.startMiniDFSCluster(1);
79
80 Path rootdir = UTIL.createRootDir();
81 FileSystem fs = FileSystem.get(UTIL.getConfiguration());
82 if (fs.exists(rootdir)) {
83 if (fs.delete(rootdir, true)) {
84 LOG.info("Cleaned up existing " + rootdir);
85 }
86 }
87
88
89
90
91
92
93
94 byte [] row_70001 = Bytes.toBytes("row_70001");
95 byte [] row_80001 = Bytes.toBytes("row_80001");
96
97
98
99 FSTableDescriptors.createTableDescriptor(fs, rootdir, desc);
100 HRegion [] regions = {
101 createRegion(desc, null, row_70001, 1, 70000, rootdir),
102 createRegion(desc, row_70001, row_80001, 70001, 10000, rootdir),
103 createRegion(desc, row_80001, null, 80001, 11000, rootdir)
104 };
105
106
107
108 setupROOTAndMeta(rootdir, regions);
109 try {
110 LOG.info("Starting mini zk cluster");
111 UTIL.startMiniZKCluster();
112 LOG.info("Starting mini hbase cluster");
113 UTIL.startMiniHBaseCluster(1, 1);
114 Configuration c = new Configuration(UTIL.getConfiguration());
115 CatalogTracker ct = new CatalogTracker(c);
116 ct.start();
117 List<HRegionInfo> originalTableRegions =
118 MetaReader.getTableRegions(ct, desc.getName());
119 LOG.info("originalTableRegions size=" + originalTableRegions.size() +
120 "; " + originalTableRegions);
121 HBaseAdmin admin = new HBaseAdmin(new Configuration(c));
122 admin.disableTable(desc.getName());
123 HMerge.merge(c, FileSystem.get(c), desc.getName());
124 List<HRegionInfo> postMergeTableRegions =
125 MetaReader.getTableRegions(ct, desc.getName());
126 LOG.info("postMergeTableRegions size=" + postMergeTableRegions.size() +
127 "; " + postMergeTableRegions);
128 assertTrue("originalTableRegions=" + originalTableRegions.size() +
129 ", postMergeTableRegions=" + postMergeTableRegions.size(),
130 postMergeTableRegions.size() < originalTableRegions.size());
131 LOG.info("Done with merge");
132 } finally {
133 UTIL.shutdownMiniCluster();
134 LOG.info("After cluster shutdown");
135 }
136 }
137
138 private HRegion createRegion(final HTableDescriptor desc,
139 byte [] startKey, byte [] endKey, int firstRow, int nrows, Path rootdir)
140 throws IOException {
141 HRegionInfo hri = new HRegionInfo(desc.getName(), startKey, endKey);
142 HRegion region = HRegion.createHRegion(hri, rootdir, UTIL.getConfiguration(), desc);
143 LOG.info("Created region " + region.getRegionNameAsString());
144 for(int i = firstRow; i < firstRow + nrows; i++) {
145 Put put = new Put(Bytes.toBytes("row_" + String.format("%1$05d", i)));
146 put.setWriteToWAL(false);
147 put.add(COLUMN_NAME, null, VALUE);
148 region.put(put);
149 if (i % 10000 == 0) {
150 LOG.info("Flushing write #" + i);
151 region.flushcache();
152 }
153 }
154 region.close();
155 region.getLog().closeAndDelete();
156 return region;
157 }
158
159 protected void setupROOTAndMeta(Path rootdir, final HRegion [] regions)
160 throws IOException {
161 HRegion root =
162 HRegion.createHRegion(HRegionInfo.ROOT_REGIONINFO, rootdir,
163 UTIL.getConfiguration(), HTableDescriptor.ROOT_TABLEDESC);
164 HRegion meta =
165 HRegion.createHRegion(HRegionInfo.FIRST_META_REGIONINFO, rootdir,
166 UTIL.getConfiguration(), HTableDescriptor.META_TABLEDESC);
167 HRegion.addRegionToMETA(root, meta);
168 for (HRegion r: regions) {
169 HRegion.addRegionToMETA(meta, r);
170 }
171 meta.close();
172 meta.getLog().closeAndDelete();
173 root.close();
174 root.getLog().closeAndDelete();
175 }
176 }