org.apache.hadoop.hbase.mapreduce.replication.VerifyReplication Maven / Gradle / Ivy
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/**
*
* 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.mapreduce.replication;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.HConnectable;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HConnectionManager;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.TableInputFormat;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.hbase.mapreduce.TableMapper;
import org.apache.hadoop.hbase.mapreduce.TableSplit;
import org.apache.hadoop.hbase.replication.ReplicationException;
import org.apache.hadoop.hbase.replication.ReplicationFactory;
import org.apache.hadoop.hbase.replication.ReplicationPeerZKImpl;
import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
import org.apache.hadoop.hbase.replication.ReplicationPeers;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
/**
* This map-only job compares the data from a local table with a remote one.
* Every cell is compared and must have exactly the same keys (even timestamp)
* as well as same value. It is possible to restrict the job by time range and
* families. The peer id that's provided must match the one given when the
* replication stream was setup.
*
* Two counters are provided, Verifier.Counters.GOODROWS and BADROWS. The reason
* for a why a row is different is shown in the map's log.
*/
public class VerifyReplication extends Configured implements Tool {
private static final Log LOG =
LogFactory.getLog(VerifyReplication.class);
public final static String NAME = "verifyrep";
static long startTime = 0;
static long endTime = Long.MAX_VALUE;
static int versions = -1;
static String tableName = null;
static String families = null;
static String peerId = null;
/**
* Map-only comparator for 2 tables
*/
public static class Verifier
extends TableMapper {
public static enum Counters {
GOODROWS, BADROWS, ONLY_IN_SOURCE_TABLE_ROWS, ONLY_IN_PEER_TABLE_ROWS, CONTENT_DIFFERENT_ROWS}
private ResultScanner replicatedScanner;
private Result currentCompareRowInPeerTable;
private Table replicatedTable;
/**
* Map method that compares every scanned row with the equivalent from
* a distant cluster.
* @param row The current table row key.
* @param value The columns.
* @param context The current context.
* @throws IOException When something is broken with the data.
*/
@Override
public void map(ImmutableBytesWritable row, final Result value,
Context context)
throws IOException {
if (replicatedScanner == null) {
Configuration conf = context.getConfiguration();
final Scan scan = new Scan();
scan.setCaching(conf.getInt(TableInputFormat.SCAN_CACHEDROWS, 1));
long startTime = conf.getLong(NAME + ".startTime", 0);
long endTime = conf.getLong(NAME + ".endTime", Long.MAX_VALUE);
String families = conf.get(NAME + ".families", null);
if(families != null) {
String[] fams = families.split(",");
for(String fam : fams) {
scan.addFamily(Bytes.toBytes(fam));
}
}
scan.setTimeRange(startTime, endTime);
if (versions >= 0) {
scan.setMaxVersions(versions);
}
final TableSplit tableSplit = (TableSplit)(context.getInputSplit());
HConnectionManager.execute(new HConnectable(conf) {
@Override
public Void connect(HConnection conn) throws IOException {
String zkClusterKey = conf.get(NAME + ".peerQuorumAddress");
Configuration peerConf = HBaseConfiguration.create(conf);
ZKUtil.applyClusterKeyToConf(peerConf, zkClusterKey);
TableName tableName = TableName.valueOf(conf.get(NAME + ".tableName"));
replicatedTable = new HTable(peerConf, tableName);
scan.setStartRow(value.getRow());
scan.setStopRow(tableSplit.getEndRow());
replicatedScanner = replicatedTable.getScanner(scan);
return null;
}
});
currentCompareRowInPeerTable = replicatedScanner.next();
}
while (true) {
if (currentCompareRowInPeerTable == null) {
// reach the region end of peer table, row only in source table
logFailRowAndIncreaseCounter(context, Counters.ONLY_IN_SOURCE_TABLE_ROWS, value);
break;
}
int rowCmpRet = Bytes.compareTo(value.getRow(), currentCompareRowInPeerTable.getRow());
if (rowCmpRet == 0) {
// rowkey is same, need to compare the content of the row
try {
Result.compareResults(value, currentCompareRowInPeerTable);
context.getCounter(Counters.GOODROWS).increment(1);
} catch (Exception e) {
logFailRowAndIncreaseCounter(context, Counters.CONTENT_DIFFERENT_ROWS, value);
}
currentCompareRowInPeerTable = replicatedScanner.next();
break;
} else if (rowCmpRet < 0) {
// row only exists in source table
logFailRowAndIncreaseCounter(context, Counters.ONLY_IN_SOURCE_TABLE_ROWS, value);
break;
} else {
// row only exists in peer table
logFailRowAndIncreaseCounter(context, Counters.ONLY_IN_PEER_TABLE_ROWS,
currentCompareRowInPeerTable);
currentCompareRowInPeerTable = replicatedScanner.next();
}
}
}
private void logFailRowAndIncreaseCounter(Context context, Counters counter, Result row) {
context.getCounter(counter).increment(1);
context.getCounter(Counters.BADROWS).increment(1);
LOG.error(counter.toString() + ", rowkey=" + Bytes.toString(row.getRow()));
}
@Override
protected void cleanup(Context context) {
if (replicatedScanner != null) {
try {
while (currentCompareRowInPeerTable != null) {
logFailRowAndIncreaseCounter(context, Counters.ONLY_IN_PEER_TABLE_ROWS,
currentCompareRowInPeerTable);
currentCompareRowInPeerTable = replicatedScanner.next();
}
} catch (Exception e) {
LOG.error("fail to scan peer table in cleanup", e);
} finally {
replicatedScanner.close();
replicatedScanner = null;
}
}
if (replicatedTable != null) {
TableName tableName = replicatedTable.getName();
try {
replicatedTable.close();
} catch (IOException ioe) {
LOG.warn("Exception closing " + tableName, ioe);
}
}
}
}
private static String getPeerQuorumAddress(final Configuration conf) throws IOException {
ZooKeeperWatcher localZKW = null;
ReplicationPeerZKImpl peer = null;
try {
localZKW = new ZooKeeperWatcher(conf, "VerifyReplication",
new Abortable() {
@Override public void abort(String why, Throwable e) {}
@Override public boolean isAborted() {return false;}
});
ReplicationPeers rp = ReplicationFactory.getReplicationPeers(localZKW, conf, localZKW);
rp.init();
Pair pair = rp.getPeerConf(peerId);
if (pair == null) {
throw new IOException("Couldn't get peer conf!");
}
Configuration peerConf = rp.getPeerConf(peerId).getSecond();
return ZKUtil.getZooKeeperClusterKey(peerConf);
} catch (ReplicationException e) {
throw new IOException(
"An error occured while trying to connect to the remove peer cluster", e);
} finally {
if (peer != null) {
peer.close();
}
if (localZKW != null) {
localZKW.close();
}
}
}
/**
* Sets up the actual job.
*
* @param conf The current configuration.
* @param args The command line parameters.
* @return The newly created job.
* @throws java.io.IOException When setting up the job fails.
*/
public static Job createSubmittableJob(Configuration conf, String[] args)
throws IOException {
if (!doCommandLine(args)) {
return null;
}
if (!conf.getBoolean(HConstants.REPLICATION_ENABLE_KEY,
HConstants.REPLICATION_ENABLE_DEFAULT)) {
throw new IOException("Replication needs to be enabled to verify it.");
}
conf.set(NAME+".peerId", peerId);
conf.set(NAME+".tableName", tableName);
conf.setLong(NAME+".startTime", startTime);
conf.setLong(NAME+".endTime", endTime);
if (families != null) {
conf.set(NAME+".families", families);
}
String peerQuorumAddress = getPeerQuorumAddress(conf);
conf.set(NAME + ".peerQuorumAddress", peerQuorumAddress);
LOG.info("Peer Quorum Address: " + peerQuorumAddress);
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(VerifyReplication.class);
Scan scan = new Scan();
scan.setTimeRange(startTime, endTime);
if (versions >= 0) {
scan.setMaxVersions(versions);
}
if(families != null) {
String[] fams = families.split(",");
for(String fam : fams) {
scan.addFamily(Bytes.toBytes(fam));
}
}
TableMapReduceUtil.initTableMapperJob(tableName, scan,
Verifier.class, null, null, job);
// Obtain the auth token from peer cluster
TableMapReduceUtil.initCredentialsForCluster(job, peerQuorumAddress);
job.setOutputFormatClass(NullOutputFormat.class);
job.setNumReduceTasks(0);
return job;
}
private static boolean doCommandLine(final String[] args) {
if (args.length < 2) {
printUsage(null);
return false;
}
try {
for (int i = 0; i < args.length; i++) {
String cmd = args[i];
if (cmd.equals("-h") || cmd.startsWith("--h")) {
printUsage(null);
return false;
}
final String startTimeArgKey = "--starttime=";
if (cmd.startsWith(startTimeArgKey)) {
startTime = Long.parseLong(cmd.substring(startTimeArgKey.length()));
continue;
}
final String endTimeArgKey = "--endtime=";
if (cmd.startsWith(endTimeArgKey)) {
endTime = Long.parseLong(cmd.substring(endTimeArgKey.length()));
continue;
}
final String versionsArgKey = "--versions=";
if (cmd.startsWith(versionsArgKey)) {
versions = Integer.parseInt(cmd.substring(versionsArgKey.length()));
continue;
}
final String familiesArgKey = "--families=";
if (cmd.startsWith(familiesArgKey)) {
families = cmd.substring(familiesArgKey.length());
continue;
}
if (i == args.length-2) {
peerId = cmd;
}
if (i == args.length-1) {
tableName = cmd;
}
}
} catch (Exception e) {
e.printStackTrace();
printUsage("Can't start because " + e.getMessage());
return false;
}
return true;
}
/*
* @param errorMsg Error message. Can be null.
*/
private static void printUsage(final String errorMsg) {
if (errorMsg != null && errorMsg.length() > 0) {
System.err.println("ERROR: " + errorMsg);
}
System.err.println("Usage: verifyrep [--starttime=X]" +
" [--stoptime=Y] [--families=A] ");
System.err.println();
System.err.println("Options:");
System.err.println(" starttime beginning of the time range");
System.err.println(" without endtime means from starttime to forever");
System.err.println(" endtime end of the time range");
System.err.println(" versions number of cell versions to verify");
System.err.println(" families comma-separated list of families to copy");
System.err.println();
System.err.println("Args:");
System.err.println(" peerid Id of the peer used for verification, must match the one given for replication");
System.err.println(" tablename Name of the table to verify");
System.err.println();
System.err.println("Examples:");
System.err.println(" To verify the data replicated from TestTable for a 1 hour window with peer #5 ");
System.err.println(" $ bin/hbase " +
"org.apache.hadoop.hbase.mapreduce.replication.VerifyReplication" +
" --starttime=1265875194289 --endtime=1265878794289 5 TestTable ");
}
@Override
public int run(String[] args) throws Exception {
Configuration conf = this.getConf();
Job job = createSubmittableJob(conf, args);
if (job != null) {
return job.waitForCompletion(true) ? 0 : 1;
}
return 1;
}
/**
* Main entry point.
*
* @param args The command line parameters.
* @throws Exception When running the job fails.
*/
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(HBaseConfiguration.create(), new VerifyReplication(), args);
System.exit(res);
}
}