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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.text.MessageFormat;
26 import java.util.ArrayList;
27 import java.util.HashMap;
28 import java.util.List;
29
30 import javax.naming.NamingException;
31
32 import org.apache.commons.logging.Log;
33 import org.apache.commons.logging.LogFactory;
34 import org.apache.hadoop.classification.InterfaceAudience;
35 import org.apache.hadoop.classification.InterfaceStability;
36 import org.apache.hadoop.hbase.HConstants;
37 import org.apache.hadoop.hbase.HRegionLocation;
38 import org.apache.hadoop.hbase.client.HTable;
39 import org.apache.hadoop.hbase.client.Result;
40 import org.apache.hadoop.hbase.client.Scan;
41 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
42 import org.apache.hadoop.hbase.util.Addressing;
43 import org.apache.hadoop.hbase.util.Bytes;
44 import org.apache.hadoop.hbase.util.Pair;
45 import org.apache.hadoop.hbase.util.RegionSizeCalculator;
46 import org.apache.hadoop.hbase.util.Strings;
47 import org.apache.hadoop.mapreduce.InputFormat;
48 import org.apache.hadoop.mapreduce.InputSplit;
49 import org.apache.hadoop.mapreduce.JobContext;
50 import org.apache.hadoop.mapreduce.RecordReader;
51 import org.apache.hadoop.mapreduce.TaskAttemptContext;
52 import org.apache.hadoop.net.DNS;
53 import org.apache.hadoop.util.StringUtils;
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83 @InterfaceAudience.Public
84 @InterfaceStability.Stable
85 public abstract class TableInputFormatBase
86 extends InputFormat<ImmutableBytesWritable, Result> {
87
88 final Log LOG = LogFactory.getLog(TableInputFormatBase.class);
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91 private Scan scan = null;
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93 private HTable table = null;
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95 private TableRecordReader tableRecordReader = null;
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99 private HashMap<InetAddress, String> reverseDNSCacheMap =
100 new HashMap<InetAddress, String>();
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103 private String nameServer = null;
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117 @Override
118 public RecordReader<ImmutableBytesWritable, Result> createRecordReader(
119 InputSplit split, TaskAttemptContext context)
120 throws IOException {
121 if (table == null) {
122 throw new IOException("Cannot create a record reader because of a" +
123 " previous error. Please look at the previous logs lines from" +
124 " the task's full log for more details.");
125 }
126 TableSplit tSplit = (TableSplit) split;
127 LOG.info("Input split length: " + StringUtils.humanReadableInt(tSplit.getLength()) + " bytes.");
128 TableRecordReader trr = this.tableRecordReader;
129
130 if (trr == null) {
131 trr = new TableRecordReader();
132 }
133 Scan sc = new Scan(this.scan);
134 sc.setStartRow(tSplit.getStartRow());
135 sc.setStopRow(tSplit.getEndRow());
136 trr.setScan(sc);
137 trr.setHTable(table);
138 return trr;
139 }
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151 @Override
152 public List<InputSplit> getSplits(JobContext context) throws IOException {
153 if (table == null) {
154 throw new IOException("No table was provided.");
155 }
156
157 this.nameServer =
158 context.getConfiguration().get("hbase.nameserver.address", null);
159
160 RegionSizeCalculator sizeCalculator = new RegionSizeCalculator(table);
161
162 Pair<byte[][], byte[][]> keys = table.getStartEndKeys();
163 if (keys == null || keys.getFirst() == null ||
164 keys.getFirst().length == 0) {
165 HRegionLocation regLoc = table.getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);
166 if (null == regLoc) {
167 throw new IOException("Expecting at least one region.");
168 }
169 List<InputSplit> splits = new ArrayList<InputSplit>(1);
170 long regionSize = sizeCalculator.getRegionSize(regLoc.getRegionInfo().getRegionName());
171 TableSplit split = new TableSplit(table.getName(),
172 HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY, regLoc
173 .getHostnamePort().split(Addressing.HOSTNAME_PORT_SEPARATOR)[0], regionSize);
174 splits.add(split);
175 return splits;
176 }
177 List<InputSplit> splits = new ArrayList<InputSplit>(keys.getFirst().length);
178 for (int i = 0; i < keys.getFirst().length; i++) {
179 if ( !includeRegionInSplit(keys.getFirst()[i], keys.getSecond()[i])) {
180 continue;
181 }
182 HRegionLocation location = table.getRegionLocation(keys.getFirst()[i], false);
183
184 InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());
185 if (isa.isUnresolved()) {
186 LOG.warn("Failed resolve " + isa);
187 }
188 InetAddress regionAddress = isa.getAddress();
189 String regionLocation;
190 try {
191 regionLocation = reverseDNS(regionAddress);
192 } catch (NamingException e) {
193 LOG.warn("Cannot resolve the host name for " + regionAddress + " because of " + e);
194 regionLocation = location.getHostname();
195 }
196
197 byte[] startRow = scan.getStartRow();
198 byte[] stopRow = scan.getStopRow();
199
200 if ((startRow.length == 0 || keys.getSecond()[i].length == 0 ||
201 Bytes.compareTo(startRow, keys.getSecond()[i]) < 0) &&
202 (stopRow.length == 0 ||
203 Bytes.compareTo(stopRow, keys.getFirst()[i]) > 0)) {
204 byte[] splitStart = startRow.length == 0 ||
205 Bytes.compareTo(keys.getFirst()[i], startRow) >= 0 ?
206 keys.getFirst()[i] : startRow;
207 byte[] splitStop = (stopRow.length == 0 ||
208 Bytes.compareTo(keys.getSecond()[i], stopRow) <= 0) &&
209 keys.getSecond()[i].length > 0 ?
210 keys.getSecond()[i] : stopRow;
211
212 byte[] regionName = location.getRegionInfo().getRegionName();
213 long regionSize = sizeCalculator.getRegionSize(regionName);
214 TableSplit split = new TableSplit(table.getName(),
215 splitStart, splitStop, regionLocation, regionSize);
216 splits.add(split);
217 if (LOG.isDebugEnabled()) {
218 LOG.debug("getSplits: split -> " + i + " -> " + split);
219 }
220 }
221 }
222 return splits;
223 }
224
225 private String reverseDNS(InetAddress ipAddress) throws NamingException {
226 String hostName = this.reverseDNSCacheMap.get(ipAddress);
227 if (hostName == null) {
228 hostName = Strings.domainNamePointerToHostName(
229 DNS.reverseDns(ipAddress, this.nameServer));
230 this.reverseDNSCacheMap.put(ipAddress, hostName);
231 }
232 return hostName;
233 }
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257 protected boolean includeRegionInSplit(final byte[] startKey, final byte [] endKey) {
258 return true;
259 }
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264 protected HTable getHTable() {
265 return this.table;
266 }
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273 protected void setHTable(HTable table) {
274 this.table = table;
275 }
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282 public Scan getScan() {
283 if (this.scan == null) this.scan = new Scan();
284 return scan;
285 }
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292 public void setScan(Scan scan) {
293 this.scan = scan;
294 }
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302 protected void setTableRecordReader(TableRecordReader tableRecordReader) {
303 this.tableRecordReader = tableRecordReader;
304 }
305 }