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19 package org.apache.hadoop.hbase.mapreduce;
20
21 import java.io.IOException;
22 import java.io.InterruptedIOException;
23 import java.net.InetAddress;
24 import java.net.InetSocketAddress;
25 import java.util.ArrayList;
26 import java.util.HashMap;
27 import java.util.List;
28
29 import javax.naming.NamingException;
30
31 import org.apache.commons.logging.Log;
32 import org.apache.commons.logging.LogFactory;
33 import org.apache.hadoop.classification.InterfaceAudience;
34 import org.apache.hadoop.classification.InterfaceStability;
35 import org.apache.hadoop.hbase.HConstants;
36 import org.apache.hadoop.hbase.HRegionLocation;
37 import org.apache.hadoop.hbase.client.HTable;
38 import org.apache.hadoop.hbase.client.Result;
39 import org.apache.hadoop.hbase.client.Scan;
40 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
41 import org.apache.hadoop.hbase.util.Addressing;
42 import org.apache.hadoop.hbase.util.Bytes;
43 import org.apache.hadoop.hbase.util.Pair;
44 import org.apache.hadoop.hbase.util.Strings;
45 import org.apache.hadoop.mapreduce.InputFormat;
46 import org.apache.hadoop.mapreduce.InputSplit;
47 import org.apache.hadoop.mapreduce.JobContext;
48 import org.apache.hadoop.mapreduce.RecordReader;
49 import org.apache.hadoop.mapreduce.TaskAttemptContext;
50 import org.apache.hadoop.net.DNS;
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80 @InterfaceAudience.Public
81 @InterfaceStability.Stable
82 public abstract class TableInputFormatBase
83 extends InputFormat<ImmutableBytesWritable, Result> {
84
85 final Log LOG = LogFactory.getLog(TableInputFormatBase.class);
86
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88 private Scan scan = null;
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90 private HTable table = null;
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92 private TableRecordReader tableRecordReader = null;
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96 private HashMap<InetAddress, String> reverseDNSCacheMap =
97 new HashMap<InetAddress, String>();
98
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100 private String nameServer = null;
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114 @Override
115 public RecordReader<ImmutableBytesWritable, Result> createRecordReader(
116 InputSplit split, TaskAttemptContext context)
117 throws IOException {
118 if (table == null) {
119 throw new IOException("Cannot create a record reader because of a" +
120 " previous error. Please look at the previous logs lines from" +
121 " the task's full log for more details.");
122 }
123 TableSplit tSplit = (TableSplit) split;
124 TableRecordReader trr = this.tableRecordReader;
125
126 if (trr == null) {
127 trr = new TableRecordReader();
128 }
129 Scan sc = new Scan(this.scan);
130 sc.setStartRow(tSplit.getStartRow());
131 sc.setStopRow(tSplit.getEndRow());
132 trr.setScan(sc);
133 trr.setHTable(table);
134 try {
135 trr.initialize(tSplit, context);
136 } catch (InterruptedException e) {
137 throw new InterruptedIOException(e.getMessage());
138 }
139 return trr;
140 }
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151
152 @Override
153 public List<InputSplit> getSplits(JobContext context) throws IOException {
154 if (table == null) {
155 throw new IOException("No table was provided.");
156 }
157
158 this.nameServer =
159 context.getConfiguration().get("hbase.nameserver.address", null);
160
161 Pair<byte[][], byte[][]> keys = table.getStartEndKeys();
162 if (keys == null || keys.getFirst() == null ||
163 keys.getFirst().length == 0) {
164 HRegionLocation regLoc = table.getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);
165 if (null == regLoc) {
166 throw new IOException("Expecting at least one region.");
167 }
168 List<InputSplit> splits = new ArrayList<InputSplit>(1);
169 InputSplit split = new TableSplit(table.getTableName(),
170 HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY, regLoc
171 .getHostnamePort().split(Addressing.HOSTNAME_PORT_SEPARATOR)[0]);
172 splits.add(split);
173 return splits;
174 }
175 List<InputSplit> splits = new ArrayList<InputSplit>(keys.getFirst().length);
176 for (int i = 0; i < keys.getFirst().length; i++) {
177 if ( !includeRegionInSplit(keys.getFirst()[i], keys.getSecond()[i])) {
178 continue;
179 }
180 HRegionLocation location = table.getRegionLocation(keys.getFirst()[i], false);
181
182 InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());
183 if (isa.isUnresolved()) {
184 LOG.warn("Failed resolve " + isa);
185 }
186 InetAddress regionAddress = isa.getAddress();
187 String regionLocation;
188 try {
189 regionLocation = reverseDNS(regionAddress);
190 } catch (NamingException e) {
191 LOG.error("Cannot resolve the host name for " + regionAddress + " because of " + e);
192 regionLocation = location.getHostname();
193 }
194
195 byte[] startRow = scan.getStartRow();
196 byte[] stopRow = scan.getStopRow();
197
198 if ((startRow.length == 0 || keys.getSecond()[i].length == 0 ||
199 Bytes.compareTo(startRow, keys.getSecond()[i]) < 0) &&
200 (stopRow.length == 0 ||
201 Bytes.compareTo(stopRow, keys.getFirst()[i]) > 0)) {
202 byte[] splitStart = startRow.length == 0 ||
203 Bytes.compareTo(keys.getFirst()[i], startRow) >= 0 ?
204 keys.getFirst()[i] : startRow;
205 byte[] splitStop = (stopRow.length == 0 ||
206 Bytes.compareTo(keys.getSecond()[i], stopRow) <= 0) &&
207 keys.getSecond()[i].length > 0 ?
208 keys.getSecond()[i] : stopRow;
209 InputSplit split = new TableSplit(table.getTableName(),
210 splitStart, splitStop, regionLocation);
211 splits.add(split);
212 if (LOG.isDebugEnabled()) {
213 LOG.debug("getSplits: split -> " + i + " -> " + split);
214 }
215 }
216 }
217 return splits;
218 }
219
220 private String reverseDNS(InetAddress ipAddress) throws NamingException {
221 String hostName = this.reverseDNSCacheMap.get(ipAddress);
222 if (hostName == null) {
223 hostName = Strings.domainNamePointerToHostName(
224 DNS.reverseDns(ipAddress, this.nameServer));
225 this.reverseDNSCacheMap.put(ipAddress, hostName);
226 }
227 return hostName;
228 }
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252 protected boolean includeRegionInSplit(final byte[] startKey, final byte [] endKey) {
253 return true;
254 }
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259 protected HTable getHTable() {
260 return this.table;
261 }
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268 protected void setHTable(HTable table) {
269 this.table = table;
270 }
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277 public Scan getScan() {
278 if (this.scan == null) this.scan = new Scan();
279 return scan;
280 }
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287 public void setScan(Scan scan) {
288 this.scan = scan;
289 }
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297 protected void setTableRecordReader(TableRecordReader tableRecordReader) {
298 this.tableRecordReader = tableRecordReader;
299 }
300 }