TestKeyValueTextInputFormat.java
/**
* 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.mapred;
import java.io.*;
import java.util.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.io.compress.*;
import org.apache.hadoop.util.LineReader;
import org.apache.hadoop.util.ReflectionUtils;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
public class TestKeyValueTextInputFormat {
private static final Logger LOG =
LoggerFactory.getLogger(TestKeyValueTextInputFormat.class);
private static int MAX_LENGTH = 10000;
private static JobConf defaultConf = new JobConf();
private static FileSystem localFs = null;
static {
try {
localFs = FileSystem.getLocal(defaultConf);
} catch (IOException e) {
throw new RuntimeException("init failure", e);
}
}
private static Path workDir =
new Path(new Path(System.getProperty("test.build.data", "."), "data"),
"TestKeyValueTextInputFormat");
@Test
public void testFormat() throws Exception {
JobConf job = new JobConf();
Path file = new Path(workDir, "test.txt");
// A reporter that does nothing
Reporter reporter = Reporter.NULL;
int seed = new Random().nextInt();
LOG.info("seed = "+seed);
Random random = new Random(seed);
localFs.delete(workDir, true);
FileInputFormat.setInputPaths(job, workDir);
// for a variety of lengths
for (int length = 0; length < MAX_LENGTH;
length+= random.nextInt(MAX_LENGTH/10)+1) {
LOG.debug("creating; entries = " + length);
// create a file with length entries
Writer writer = new OutputStreamWriter(localFs.create(file));
try {
for (int i = 0; i < length; i++) {
writer.write(Integer.toString(i*2));
writer.write("\t");
writer.write(Integer.toString(i));
writer.write("\n");
}
} finally {
writer.close();
}
// try splitting the file in a variety of sizes
KeyValueTextInputFormat format = new KeyValueTextInputFormat();
format.configure(job);
for (int i = 0; i < 3; i++) {
int numSplits = random.nextInt(MAX_LENGTH/20)+1;
LOG.debug("splitting: requesting = " + numSplits);
InputSplit[] splits = format.getSplits(job, numSplits);
LOG.debug("splitting: got = " + splits.length);
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.length; j++) {
LOG.debug("split["+j+"]= " + splits[j]);
RecordReader<Text, Text> reader =
format.getRecordReader(splits[j], job, reporter);
Class readerClass = reader.getClass();
assertEquals(KeyValueLineRecordReader.class, readerClass,
"reader class is KeyValueLineRecordReader.");
Text key = reader.createKey();
Class keyClass = key.getClass();
Text value = reader.createValue();
Class valueClass = value.getClass();
assertEquals(Text.class, keyClass, "Key class is Text.");
assertEquals(Text.class, valueClass, "Value class is Text.");
try {
int count = 0;
while (reader.next(key, value)) {
int v = Integer.parseInt(value.toString());
LOG.debug("read " + v);
if (bits.get(v)) {
LOG.warn("conflict with " + v +
" in split " + j +
" at position "+reader.getPos());
}
assertFalse(bits.get(v), "Key in multiple partitions.");
bits.set(v);
count++;
}
LOG.debug("splits["+j+"]="+splits[j]+" count=" + count);
} finally {
reader.close();
}
}
assertEquals(length, bits.cardinality(), "Some keys in no partition.");
}
}
}
private LineReader makeStream(String str) throws IOException {
return new LineReader(new ByteArrayInputStream(str.getBytes(UTF_8)), defaultConf);
}
@Test
public void testUTF8() throws Exception {
LineReader in = null;
try {
in = makeStream("abcd\u20acbdcd\u20ac");
Text line = new Text();
in.readLine(line);
assertEquals("abcd\u20acbdcd\u20ac", line.toString(),
"readLine changed utf8 characters");
in = makeStream("abc\u200axyz");
in.readLine(line);
assertEquals("abc\u200axyz", line.toString(),
"split on fake newline");
} finally {
if (in != null) {
in.close();
}
}
}
@Test
public void testNewLines() throws Exception {
LineReader in = null;
try {
in = makeStream("a\nbb\n\nccc\rdddd\r\neeeee");
Text out = new Text();
in.readLine(out);
assertEquals(1, out.getLength(), "line1 length");
in.readLine(out);
assertEquals(2, out.getLength(), "line2 length");
in.readLine(out);
assertEquals(0, out.getLength(), "line3 length");
in.readLine(out);
assertEquals(3, out.getLength(), "line4 length");
in.readLine(out);
assertEquals(4, out.getLength(), "line5 length");
in.readLine(out);
assertEquals(5, out.getLength(), "line5 length");
assertEquals(0, in.readLine(out), "end of file");
} finally {
if (in != null) {
in.close();
}
}
}
private static void writeFile(FileSystem fs, Path name,
CompressionCodec codec,
String contents) throws IOException {
OutputStream stm;
if (codec == null) {
stm = fs.create(name);
} else {
stm = codec.createOutputStream(fs.create(name));
}
stm.write(contents.getBytes());
stm.close();
}
private static final Reporter voidReporter = Reporter.NULL;
private static List<Text> readSplit(KeyValueTextInputFormat format,
InputSplit split,
JobConf job) throws IOException {
List<Text> result = new ArrayList<Text>();
RecordReader<Text, Text> reader = null;
try {
reader = format.getRecordReader(split, job, voidReporter);
Text key = reader.createKey();
Text value = reader.createValue();
while (reader.next(key, value)) {
result.add(value);
value = (Text) reader.createValue();
}
} finally {
if (reader != null) {
reader.close();
}
}
return result;
}
/**
* Test using the gzip codec for reading
*/
@Test
public void testGzip() throws IOException {
JobConf job = new JobConf();
CompressionCodec gzip = new GzipCodec();
ReflectionUtils.setConf(gzip, job);
localFs.delete(workDir, true);
writeFile(localFs, new Path(workDir, "part1.txt.gz"), gzip,
"line-1\tthe quick\nline-2\tbrown\nline-3\tfox jumped\nline-4\tover\nline-5\t the lazy\nline-6\t dog\n");
writeFile(localFs, new Path(workDir, "part2.txt.gz"), gzip,
"line-1\tthis is a test\nline-1\tof gzip\n");
FileInputFormat.setInputPaths(job, workDir);
KeyValueTextInputFormat format = new KeyValueTextInputFormat();
format.configure(job);
InputSplit[] splits = format.getSplits(job, 100);
assertEquals(2, splits.length, "compressed splits == 2");
FileSplit tmp = (FileSplit) splits[0];
if (tmp.getPath().getName().equals("part2.txt.gz")) {
splits[0] = splits[1];
splits[1] = tmp;
}
List<Text> results = readSplit(format, splits[0], job);
assertEquals(6, results.size(), "splits[0] length");
assertEquals(" dog", results.get(5).toString(), "splits[0][5]");
results = readSplit(format, splits[1], job);
assertEquals(2, results.size(), "splits[1] length");
assertEquals("this is a test", results.get(0).toString(), "splits[1][0]");
assertEquals("of gzip", results.get(1).toString(), "splits[1][1]");
}
public static void main(String[] args) throws Exception {
new TestKeyValueTextInputFormat().testFormat();
}
}