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19 package org.apache.hadoop.hbase.mapreduce.replication;
20
21 import java.io.IOException;
22
23 import org.apache.commons.logging.Log;
24 import org.apache.commons.logging.LogFactory;
25 import org.apache.hadoop.conf.Configuration;
26 import org.apache.hadoop.hbase.*;
27 import org.apache.hadoop.hbase.client.HConnectable;
28 import org.apache.hadoop.hbase.client.HConnection;
29 import org.apache.hadoop.hbase.client.HConnectionManager;
30 import org.apache.hadoop.hbase.client.HTable;
31 import org.apache.hadoop.hbase.client.Put;
32 import org.apache.hadoop.hbase.client.Result;
33 import org.apache.hadoop.hbase.client.ResultScanner;
34 import org.apache.hadoop.hbase.client.Scan;
35 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
36 import org.apache.hadoop.hbase.mapreduce.TableInputFormat;
37 import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
38 import org.apache.hadoop.hbase.mapreduce.TableMapper;
39 import org.apache.hadoop.hbase.replication.ReplicationFactory;
40 import org.apache.hadoop.hbase.replication.ReplicationPeer;
41 import org.apache.hadoop.hbase.replication.ReplicationPeers;
42 import org.apache.hadoop.hbase.replication.ReplicationPeersZKImpl;
43 import org.apache.hadoop.hbase.util.Bytes;
44 import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
45 import org.apache.hadoop.mapreduce.Job;
46 import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
47 import org.apache.zookeeper.KeeperException;
48
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58
59 public class VerifyReplication {
60
61 private static final Log LOG =
62 LogFactory.getLog(VerifyReplication.class);
63
64 public final static String NAME = "verifyrep";
65 static long startTime = 0;
66 static long endTime = 0;
67 static String tableName = null;
68 static String families = null;
69 static String peerId = null;
70
71
72
73
74 public static class Verifier
75 extends TableMapper<ImmutableBytesWritable, Put> {
76
77 public static enum Counters {GOODROWS, BADROWS}
78
79 private ResultScanner replicatedScanner;
80
81
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87
88
89 @Override
90 public void map(ImmutableBytesWritable row, final Result value,
91 Context context)
92 throws IOException {
93 if (replicatedScanner == null) {
94 Configuration conf = context.getConfiguration();
95 final Scan scan = new Scan();
96 scan.setCaching(conf.getInt(TableInputFormat.SCAN_CACHEDROWS, 1));
97 long startTime = conf.getLong(NAME + ".startTime", 0);
98 long endTime = conf.getLong(NAME + ".endTime", 0);
99 String families = conf.get(NAME + ".families", null);
100 if(families != null) {
101 String[] fams = families.split(",");
102 for(String fam : fams) {
103 scan.addFamily(Bytes.toBytes(fam));
104 }
105 }
106 if (startTime != 0) {
107 scan.setTimeRange(startTime,
108 endTime == 0 ? HConstants.LATEST_TIMESTAMP : endTime);
109 }
110 HConnectionManager.execute(new HConnectable<Void>(conf) {
111 @Override
112 public Void connect(HConnection conn) throws IOException {
113 ZooKeeperWatcher localZKW = null;
114 ReplicationPeer peer = null;
115 try {
116 localZKW = new ZooKeeperWatcher(
117 conf, "VerifyReplication", new Abortable() {
118 @Override public void abort(String why, Throwable e) {}
119 @Override public boolean isAborted() {return false;}
120 });
121 ReplicationPeers rp =
122 ReplicationFactory.getReplicationPeers(localZKW, conf, localZKW);
123 rp.init();
124 Configuration peerConf = rp.getPeerConf(peerId);
125 if (peerConf == null) {
126 throw new IOException("Couldn't get peer conf!");
127 }
128 HTable replicatedTable = new HTable(peerConf, conf.get(NAME + ".tableName"));
129 scan.setStartRow(value.getRow());
130 replicatedScanner = replicatedTable.getScanner(scan);
131 } catch (KeeperException e) {
132 throw new IOException("Got a ZK exception", e);
133 } finally {
134 if (peer != null) {
135 peer.close();
136 }
137 if (localZKW != null) {
138 localZKW.close();
139 }
140 }
141 return null;
142 }
143 });
144 }
145 Result res = replicatedScanner.next();
146 try {
147 Result.compareResults(value, res);
148 context.getCounter(Counters.GOODROWS).increment(1);
149 } catch (Exception e) {
150 LOG.warn("Bad row", e);
151 context.getCounter(Counters.BADROWS).increment(1);
152 }
153 }
154
155 protected void cleanup(Context context) {
156 if (replicatedScanner != null) {
157 replicatedScanner.close();
158 replicatedScanner = null;
159 }
160 }
161 }
162
163
164
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167
168
169
170
171 public static Job createSubmittableJob(Configuration conf, String[] args)
172 throws IOException {
173 if (!doCommandLine(args)) {
174 return null;
175 }
176 if (!conf.getBoolean(HConstants.REPLICATION_ENABLE_KEY, false)) {
177 throw new IOException("Replication needs to be enabled to verify it.");
178 }
179 conf.set(NAME+".peerId", peerId);
180 conf.set(NAME+".tableName", tableName);
181 conf.setLong(NAME+".startTime", startTime);
182 conf.setLong(NAME+".endTime", endTime);
183 if (families != null) {
184 conf.set(NAME+".families", families);
185 }
186 Job job = new Job(conf, NAME + "_" + tableName);
187 job.setJarByClass(VerifyReplication.class);
188
189 Scan scan = new Scan();
190 if (startTime != 0) {
191 scan.setTimeRange(startTime,
192 endTime == 0 ? HConstants.LATEST_TIMESTAMP : endTime);
193 }
194 if(families != null) {
195 String[] fams = families.split(",");
196 for(String fam : fams) {
197 scan.addFamily(Bytes.toBytes(fam));
198 }
199 }
200 TableMapReduceUtil.initTableMapperJob(tableName, scan,
201 Verifier.class, null, null, job);
202 job.setOutputFormatClass(NullOutputFormat.class);
203 job.setNumReduceTasks(0);
204 return job;
205 }
206
207 private static boolean doCommandLine(final String[] args) {
208 if (args.length < 2) {
209 printUsage(null);
210 return false;
211 }
212 try {
213 for (int i = 0; i < args.length; i++) {
214 String cmd = args[i];
215 if (cmd.equals("-h") || cmd.startsWith("--h")) {
216 printUsage(null);
217 return false;
218 }
219
220 final String startTimeArgKey = "--starttime=";
221 if (cmd.startsWith(startTimeArgKey)) {
222 startTime = Long.parseLong(cmd.substring(startTimeArgKey.length()));
223 continue;
224 }
225
226 final String endTimeArgKey = "--endtime=";
227 if (cmd.startsWith(endTimeArgKey)) {
228 endTime = Long.parseLong(cmd.substring(endTimeArgKey.length()));
229 continue;
230 }
231
232 final String familiesArgKey = "--families=";
233 if (cmd.startsWith(familiesArgKey)) {
234 families = cmd.substring(familiesArgKey.length());
235 continue;
236 }
237
238 if (i == args.length-2) {
239 peerId = cmd;
240 }
241
242 if (i == args.length-1) {
243 tableName = cmd;
244 }
245 }
246 } catch (Exception e) {
247 e.printStackTrace();
248 printUsage("Can't start because " + e.getMessage());
249 return false;
250 }
251 return true;
252 }
253
254
255
256
257 private static void printUsage(final String errorMsg) {
258 if (errorMsg != null && errorMsg.length() > 0) {
259 System.err.println("ERROR: " + errorMsg);
260 }
261 System.err.println("Usage: verifyrep [--starttime=X]" +
262 " [--stoptime=Y] [--families=A] <peerid> <tablename>");
263 System.err.println();
264 System.err.println("Options:");
265 System.err.println(" starttime beginning of the time range");
266 System.err.println(" without endtime means from starttime to forever");
267 System.err.println(" stoptime end of the time range");
268 System.err.println(" families comma-separated list of families to copy");
269 System.err.println();
270 System.err.println("Args:");
271 System.err.println(" peerid Id of the peer used for verification, must match the one given for replication");
272 System.err.println(" tablename Name of the table to verify");
273 System.err.println();
274 System.err.println("Examples:");
275 System.err.println(" To verify the data replicated from TestTable for a 1 hour window with peer #5 ");
276 System.err.println(" $ bin/hbase " +
277 "org.apache.hadoop.hbase.mapreduce.replication.VerifyReplication" +
278 " --starttime=1265875194289 --stoptime=1265878794289 5 TestTable ");
279 }
280
281
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284
285
286
287 public static void main(String[] args) throws Exception {
288 Configuration conf = HBaseConfiguration.create();
289 Job job = createSubmittableJob(conf, args);
290 if (job != null) {
291 System.exit(job.waitForCompletion(true) ? 0 : 1);
292 }
293 }
294 }